A-S A-S T SERVICE PERSNNEL. Critical Components Information Components having special characteristics are marked s and must be replaced with parts hav

STERE AMPLIFIER A-S A-S SERVICE MANUAL IMPRTANT NTICE This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel. It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are already known and understood by the users, and have therefore not been restated. WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury, destruction of expensive components, and failure of the product to perform as specified. For these reasons, we advise all YAMAHA product owners that any service required should be performed by an authorized YAMAHA Retailer or the appointed service representative. IMPRTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form. The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and service departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributor's Service Division. WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss). IMPRTANT: Turn the unit FF during disassembly and part replacement. Recheck all work before you apply power to the unit. CNTENTS T SERVICE PERSNNEL... FRNT PANEL... REAR PANELS... REMTE CNTRL PANELS... SPECIFICATINS /... INTERNAL VIEW... 8 SERVICE PRECAUTINS... 9 DISASSEMBLY PRCEDURES... 98 AMP ADJUSTMENT... 9 UPDATING FIRMWARE... SELF-DIAGNSTIC FUNCTIN 8 IC DATA... 9 PIN CNNECTIN DIAGRAMS... BLCK DIAGRAM... PRINTED CIRCUIT BARDS... SCHEMATIC DIAGRAMS... REPLACEMENT PARTS LIST... 8 REMTE CNTRL... 88 9 Copyright 8 All rights reserved. This manual is copyrighted by YAMAHA and may not be copied or redistributed either in print or electronically without permission. P..Box, Hamamatsu, Japan '8.

A-S A-S T SERVICE PERSNNEL. Critical Components Information Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed.. Leakage Current Measurement (For V Models nly) When service has been completed, it is imperative to verify that all exposed conductive surfaces are properly insulated from supply circuits. Meter impedance should be equivalent to ohms shunted by.µf. WALL UTLET EQUIPMENT UNDER TEST INSULATING TABLE AC LEAKAGE TESTER R EQUIVALENT Leakage current must not exceed.ma. Be sure to test for leakage with the AC plug in both polarities. For U model CAUTIN F: FR CNTINUED PRTECTIN AGAINST RISK F FIRE, REPLACE NLY WITH SAME TYPE A, V FUSE. For C model CAUTIN F: REPLACE WITH SAME TYPE A, V FUSE. ATTENTIN F: UTILISER UN FUSIBLE DE RECHANGE DE MÉME TYPE DE A, V. WARNING: CHEMICAL CNTENT NTICE! This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductive harm. D NT PLACE SLDER, ELECTRICAL/ELECTRNIC R PLASTIC CMPNENTS IN YUR MUTH FR ANY REASN WHAT S EVER! Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder/flux vapor! If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food. About lead free solder / All of the P.C.B.s installed in this unit and solder joints are soldered using the lead free solder. Among some types of lead free solder currently available, it is recommended to use one of the following types for the repair work. Sn + Ag + Cu (tin + silver + copper) Sn + Cu (tin + copper) Sn + Zn + Bi (tin + zinc + bismuth) Caution: As the melting point temperature of the lead free solder is about C to C ( F to F) higher than that of the lead solder, be sure to use a soldering iron suitable to each solder.

SPECIFICATINS / A-S A-S Audio Section / Minimum RMS utput Power (Power Amp. Section) / ( Hz to khz,. % THD) 8 ohms... 9 W + 9 W ohms... W + W ohms... W + W Dynamic Power / (IHF) 8/// ohms... //9/ W Maximum utput Power [B, G models] ( khz,. % THD, ohms)... W Maximum Useful utput Power / (JEITA) [R, T, K, L, J models] ( khz, % THD) 8 ohms... W ohms... 9 W Power Band Width / 8 ohms (MAIN L/R drive)... Hz to khz Dynamic Headroom / 8 ohms.... db IEC utput Power [B, G models] ( khz,. % THD) 8 ohms... 9 W ohms... W Damping Factor / ( khz, 8 ohms)... or more Maximum Input Signal / ( khz) CD, etc. (. % THD)....8 V or less PHN (. % THD) MM... mv or less MC... mv or less Frequency Response / CD, etc. Flat position, Hz to khz... + / -. db Flat position, Hz to khz... + / -. db RIAA Equalization Deviation / ( Hz to khz) PHN MM... ±. db MC... ±. db Total Harmonic Distortion / ( Hz to khz) CD, etc. to SP UT (9 W, 8 ohms).... % or less PHN MM ( V, to REC).... % or less MC ( V, to REC).... % or less Intermodulation Distortion / (Rated output, 8 ohms) CD, etc. to SP UT.... % Signal to Noise Ratio / (IHF-A Network) (Input shorted) CD, etc. ( mv)... 98 db or more PHN MM ( mv)... 9 db or more MC ( µv)... 8 db or more Residual Noise / (IHF-A Network) FRNT L/R SP UT... µv or less Control Section / Input Sensitivity/Input Impedance / CD, etc.... mv/ k-ohms PHN MM.... mv/ k-ohms MC... µv/ ohms MAIN IN... V/ k-ohms utput Level/ utput Impedance / REC UT... mv/. k-ohms PRE UT... V/. k-ohms Rated utput Voltage / PRE UT... mv/. k-ohms REC UT... V/. k-ohms Headphone Rated utput / khz, mv,. % THD, ohms... mw / ohms Channel Separation / ( khz/ khz) CD, etc. (. k-ohms terminated).../ db or more PHN (Input shorted, Vol: - db) MM... 9/ db or more MC... / db or more Tone Control Characteristics / BASS Boost/Cut ( Hz)... ±9 db Turnover frequency... Hz TREBLE Boost/Cut ( Hz)... ±9 db Turnover frequency.... khz Audio Muting /... - db (approx.) General / Power Supply / U, C models... AC V, Hz R, L models... AC ///- V, / Hz T model... AC V, Hz K model... AC V, Hz A model... AC V, Hz B, G models... AC V, Hz J model... AC V, / Hz Power Consumption U, C, R, T, K, A, B, G, L models... W J model... W Maximum Power Consumption khz, % THD, 8 ohms... W Idling Power Consumption... 8 W ff-state Power Consumption... W Dimensions (W x H x D)... x x mm (-/8 x -/8 x 8-/ ) Weight.... kg (8 lbs. 8 oz) Finish Black color... U, C, R, T, K, A, B, G, L, J models Silver color... U, C, R, T, K, A, B, G, L, J models Accessories Remote control x, Battery (R, AA, UM-) x, Power cable ( m) x * Specifications are subject to change without notice due to product improvements. U... U.S.A. model C... Canadian model R... General model T... Chinese model K... Korean model DIMENSINS / (-/8") (-/8") A... Australian model B... British model G... European model L... Singapore model J... Japanese model (-/") (-/") (/8") 8 (-/") (") (/8") (-/8") (8-/") Unit: mm (inch)

A-S A-S INTERNAL VIEW Top view 8 9 Front view A B C D E F G FRNT () P.C.B. (R, L models) FUNCTIN () P.C.B. FRNT () P.C.B. MAIN () P.C.B. FUNCTIN () P.C.B. PWER TRANSFRMER MAIN () P.C.B. 8 MAIN () P.C.B. 9 FRNT () P.C.B. FRNT () P.C.B. A FRNT (9) P.C.B. B FRNT () P.C.B. C FRNT () P.C.B. D FRNT () P.C.B. E FRNT () P.C.B. F FRNT () P.C.B. G FRNT () P.C.B. H FRNT () P.C.B. I FUNCTIN () P.C.B. J FRNT () P.C.B. Rear view H I J 8

A-S SERVICE PRECAUTINS / Safety measures Some internal parts in this product contain high voltages and are dangerous. Be sure to take safety measures during servicing, such as wearing insulating gloves. Note that positions indicated below are dangerous even after the power is turned off because an electric charge remains and a high voltage continues to exist there. Before starting any repair work, perform discharge by connecting a discharge resistor (k-ohms/w) between terminals at following positions. The time required for discharging is about seconds.. C8 on MAIN () P.C.B... C9 on MAIN () P.C.B... C on MAIN () P.C.B... C on MAIN () P.C.B.. Refer to PRINTED CIRCUIT BARDS: MAIN () P.C.B.. * When installing the knob unit, it is necessary to position them as specified. (Refer to When installing the knob unit.) Coned disc spring L Washer side Panel side L Hook PWER N / FF switch Hook Top cover Panel side R DISASSEMBLY PRCEDURES / (Remove parts in the order as numbered.) Disconnect the power cable from the AC outlet.. Removal of Panel Side L/R a. Remove screws (), coned disc spring L and washers side. (Fig. ) b. Lift the panel side L upward and release hooks. Then remove the panel side L. (Fig. ) c. Remove screws (), coned disc spring L and washers side. (Fig. ) d. Lift the panel side R upward and release hooks. Then remove the panel side R. (Fig. ). Removal of Top Cover a. Remove screws (), screws () and screws (). (Fig. ) b. Remove the top cover. (Fig. ) Knob TC unit Knob SEL unit Knob VL unit Front panel Lock set screw Washer side mm Hook Coned disc spring L. Removal of Front Panel * Prepare an Allen wrench ( mm) for removal of knob unit. a. Loosen lock set screw to remove the knob VL unit. (Fig. ) b. Loosen lock set screw to remove the knob SEL unit. (Fig. ) c. Loosen each lock set screw to remove knob TC unit. (Fig. ) d. Remove 8 screws (). (Fig. ) e. Set the PWER N/FF switch to the N position. f. Remove the front panel forward gradually using care not to cause damage the switches. (Fig. ) Fig. An Allen wrench 9

A-S When installing the knob VL unit: a. Turn the VLUME (VR) counterclockwise fully. (Fig. ) b. Match the slit in the knob VL unit with the VLUME MIN position and install it in that state. (Fig. ) * At this time, do not tighten the lock set screw. c. Keep about. mm to. mm clearance from the front panel to knob VL unit. (Fig. ) d. Match the lock set screw position with the cut in VLUME (VR) and tighten the lock set screw. e. After installation, perform following checks. Turn the knob VL unit both directions to check that it does not rub against the front panel. Turn the knob VL unit clockwise fully and check that the slit in it matches with the VLUME MAX position. Turn the knob VL unit counterclockwise fully and check that the slit in it matches with the VLUME MIN position. When installing the knob SEL unit: a. Turn the INPUT (SW) so that the cut in it comes at the top. (Fig. ) b. Install the knob SEL unit with its lock set screw positioned at the top. (Fig. ) * At this time, do not tighten the lock set screw. c. Keep about. mm to. mm clearance from the front panel to knob SEL unit. (Fig. ) d. Match the lock set screw position with the cut in INPUT (SW) and tighten the lock set screw. e. After installation, perform following checks. Turn the knob SEL unit in both directions to check that it does not rub against the front panel. e. After installation, perform following checks. Turn the knob TC unit in both directions to check that it does not rub against the front panel. Turn the knob TC unit counterclockwise fully and check that the slit in it matches with the BALANCE L position. Turn the knob TC unit clockwise fully and check that the slit in it matches with the BALANCE R position. Center position of BALANCE VR SW Lock set screw Cut..mm Front panel VR Lock set screw When installing the knob TC unit * Use the same installation procedure for BASS, TREBLE and BALANCE. Described here is installation of BALANCE as an example. a. Turn the BALANCE (VR) in both directions and set it to the center position. (Fig. ) * VR stops at the center position when it is turned in both directions. b. Match the slit in the knob TC unit with the center position of BALANCE and install it in that state. (Fig. ) * At this time, do not tighten the lock set screw. c. Keep about. mm to. mm clearance from the front panel to knob TC unit. (Fig. ) d. Tighten the lock set screw of the knob TC unit. (Fig. ) Lock set screw Knob TC unit Knob SEL unit Fig. VLUME MIN VLUME MAX Slit Knob VL unit

A-S A-S. Removal of Front Frame Ass y a. Remove screws () to remove the frame top. (Fig. ) b. Remove 8 screws (8). (Fig. ) c. Remove CB, CB, CB, CB9, CB and SW-. (Fig. ) d. Remove the front frame ass y. (Fig. ) 8 Frame top Front frame ass'y 8 8 Front frame ass'y CB9 CB CB SW 8 CB CB SW Fig.

A-S A-S When checking the P.C.B.: Put the rubber sheet and cloth over this unit. Then place the P.C.B.s upside down on the cloth and check it. (Fig. ) Reconnect all cables (connectors) that have been disconnected. In this unit, the ground of the front frame ass y is connected to the chassis. When the front frame ass y is removed from the chassis, connect the ground point to the chassis, using a ground lead wire or the like. (Fig. ) Rubber sheet and cloth Front frame ass'y Ground lead Fig.

A-S A-S. Removal of Amplifier Unit a. Remove 8 screws (9) and screws (). (Fig. ) b. Remove the frame side L. (Fig. ) c. Remove screws (A). (Fig. ) d. Remove CB-, CB, CB8 and CB. (Fig. ) e. Remove the amplifier unit L together with the heat sink. f. Remove screws (B) and screws (C). (Fig. ) g. Remove CB, CB, CB and CB. (Fig. ) h. Remove the amplifier unit R together with the heat sink. 9 A B C 9 9 Frame side L 9 A CB CB A CB CB E E CB CB CB CB CB CB8 PWER unit AMP unit L CB CB B C Bottom cover B C CB CB Leg D D D D D Leg CB AMP unit R Fig.. Removal of Power Unit a. Remove legs by turning it counter clockwies. (Fig. ) b. Remove 8 screws (D). (Fig. ) c. Remove the bottom cover. (Fig. ) d. Remove screws (E). (Fig. ) e. Remove CB-, CB- and CB. (Fig. ) f. Remove the power unit. (Fig. ) D E

A-S A-S When installing the power unit: When installing the power unit, be very careful not to cause any damage to the cable at the bottom with the end of the screw. (Fig. ) Bottom view Cable Front side End of the screw Rear side Fig.

A-S A-S When checking the P.C.B.: Remove frame panels L/R. Put the rubber sheet and cloth over this unit. Then place the P.C.B. slantingly on the cloth and check it. (Fig. ) Reconnect all cables (connectors) that have been disconnected. In this unit, the ground of the amplifier unit L/R is connected to the chassis. When the amplifier unit L/R is removed from the chassis, connect the ground point to the chassis, using a ground lead wire or the like. (Fig. ) It is also possible to check the amplifier unit L/R from the bottom. (Fig. ) AMP unit L Rubber sheet and cloth Ground lead AMP unit R Ground lead AMP unit R AMP unit L Cloth Fig.

A-S A-S. Removal of FUNCITN () P.C.B. a. Remove screws (F) and screw (G). (Fig. 8) b. Remove CB-, CB and CB8. (Fig. 8) c. Remove the connector TR. (Fig. 8) d. Disconnect the cable (W) from the bottom. (Fig. 9) e. Remove FUNCTIN () P.C.B.. (Fig. 8) F G Solder Speaker terminal L Barrier SP L J F CB CB8 CB CB F FUNCTIN () P.C.B. CB9 CB CB FUNCTIN () P.C.B. H CB FRNT () P.C.B. I K K G CB P P Barrier SP R N L CB L Speaker terminal R Connector TR FRNT () P.C.B. CB9 Frame side R FRNT () P.C.B. M Solder Fig. 8

A-S A-S Bottom view W Fig. 9 8. Removal of Speaker Terminal L/R a. Remove screws (H) and screws (I). (Fig. 8) b. Remove CB, CB and CB9. (Fig. 8) c. Remove FUNCTIN () P.C.B.. (Fig. 8) d. Remove push rivets (J) and then remove the barrier SP L. (Fig. 8) e. Remove screws (K). (Fig. 8) f. Remove the speaker terminal L together with the P.C.B.. (Fig. 8) g. Unsolder the P.C.B. to separate the speaker terminal L. (Fig. 8) h. Remove screws (L). (Fig. 8) i. Remove CB. (Fig. 8) j. Remove FUNCTIN () P.C.B.. (Fig. 8) k. Remove screws (M) and screws (N). (Fig. 8) l. Remove frame side R. (Fig. 8) m. Remove push rivets () and then remove the barrier SP R. (Fig. 8) n. Remove screws (P). (Fig. 8) o. Remove CB9. (Fig. 8) p. Remove the speaker terminal R together with the P.C.B.. (Fig. 8) q. Unsolder the P.C.B. to separate the speaker terminal R. (Fig. 8) H I J K L M N P

A-S A-S 9. Removal of FUNCTIN () P.C.B. and FRNT () P.C.B. a. Remove 9 screws (Q), a screw (R), and screws (S). (Fig. ) b. Remove CB and CB. (Fig. ) c. Remove the cable (W) from the bottom. (Fig. ) d. Remove FUNCTIN () P.C.B and FRNT () P.C.B. together with the support PRE L/R. (Fig. ) Q R S Support PRE L CB CB S FUNCTIN () P.C.B. FRNT () P.C.B. Q Support PRE R R Q Q Q Fig. Bottom view W 8 Fig.

A-S AMP ADJUSTMENT / Idling Adjustment Precaution for handling measuring instrument The ground side of the measuring instrument to be connected to the speaker terminal of this unit must be kept in floating condition because this unit is equipped with the floating balanced power amplifier. MAIN () P.C.B. L ch DC +. to +8. mv Condition Start adjustment minutes or more after the power is turned on. Non loaded condition VR CB Idling Adjustment Adjust VR (Lch)/VR (Rch) so that the DC voltage of CB (Lch)/CB (Rch) becomes +. to +8.mV. (Fig. ) mv DC voltage / +. to +8. mv minute MAIN () P.C.B. L ch (Side A) MAIN () P.C.B. R ch (Side A) VR VR MAIN () P.C.B. R ch DC +. to +8. mv CB VR CB DC +. to +8. mv CB Front side Fig. 9

A-S UPDATING FIRMWARE / When replacing the following parts, be sure to write the latest firmware. FRNT P.C.B. Required tools Windows 98//Me/XP, PC with a serial port (RSC) Firmware downloader program FlashSta.exe (Ver..) Firmware A-S.s A-S.id RSC cross cable D-sub 9 pin female (Specifications) Pin No. RxD Pin No. TxD Pin No. GND Pin No. RTS Pin No.8 CTS Pin No. RxD Pin No. TxD Pin No. GND Pin No. RTS Pin No.8 CTS Pin No. RxD Pin No. TxD Pin No. GND Pin No. RTS Pin No.8 CTS Pin No. RxD Pin No. TxD Pin No. GND Pin No. RTS Pin No.8 CTS peration Procedures. Turn off the power of this unit and disconnect the power cable from the AC outlet.. Remove the panel side L/R and top cover. (Refer to [DISASSEMBLY PRCEDURS]). Set the switch (SW) of RSC conversion adapter to the FLASH UCM side. (Fig. ). Connect the writing port of this unit to the serial port (RSC) of the PC with RSC cross cable, RSC conversion adapter and flexible flat cable as shown below. (Fig. ) Panel side L Top cover RSC conversion adapter (Including flexible flat cable 9P, mm) / Part no.: AAX Preparation and precautions before starting the operation Download firmware upgrading program and firmware from the specified source to the same folder of the PC. Prepare the above specified RSC cross cable. While writing, keep the other application software on the PC closed. It is also recommended to keep the software on the task tray closed as well. Writing port / (FRNT () P.C.B.: CB) PC Panel side R Serial port (RSC) / RSC conversion adapter / to writing port / RSC cross cable / FLASH UCM SW THER Flexible flat cable (9P) / Fig.

A-S A-S. Connect the power cable of this unit to the AC outlet. At this time, set the PWER N/FF switch to the FF position.. Start up FlashSta.exe. Select Program is displayed. (Fig. ). Select Program: Inter flash memory, RSC Port: CMx (serial port of the PC connected to this unit). (Fig. ) 8. Confirm settings and click [K]. MC Flash Start is displayed in about seconds. (Fig. ) 9. Set the PWER N/FF switch to the N position.. Click [K]. (Fig. ) Set baudrate is displayed. (Fig. ) Select Inter flash memory. After a seconds / Select the serial port of the PC connected to the main unit. Fig.. Select 8 for Baud rate and for Program_intervals (ms). (Fig.). Click [K]. (Fig.) Select 8bps or below for the baud rate. * Reduce the baud rate if a transmission error occurs frequently. Fig.

A-S A-S. ID Check is displayed. (Fig. ) Click [Refer...], and select A-S.s. (Fig. ) * The ID code and MCU type are loaded automatically when the file is selected. (Fig. ) Click [K]. (Fig. ) When [Refer...] is clicked, the open file screen is displayed. Select the firmware A-S.s. Fig.

A-S A-S. MC Flash Start is displayed. (Fig. ) Click [E.P.R...], and Erase K? is displayed. (Fig. ) Click [K] to start writing. (Fig. ). When writing is completed, Program K. is displayed. (Fig. ) Click [K]. (Fig. ). Set the PWER N/FF switch to the FF position.. Disconnect the power cable of this unit from the AC outlet. 8. End "FlashSta. exe." 9. Disconnect the RSC cross cable, RSC conversion adapter and flexible flat cable. When click [E.P.R...], Erase K? is displayed. When click [K], writing is started. Writing / Collating / Click [K]. Writing completed / Fig.

A-S A-S Confirmation of Firmware Version Confirm that the firmware is updated successfully by checking the Indication of Firmware Version by the self-diagnostic function. For more information, refer to SELF-DIAGNSTIC FUNCTIN. Indication of Firmware Version peration procedures Turn the BALANCE and TREBLE knobs clockwise fully and then while pressing down the AU- DI MUTE switch, set the PWER N/FF switch to the N position. (Fig. ) Indication of Firmware Version The INPUT selector LED indicates the firmware version in the binary system (BCD). Example) when the firmware version is [V] "TREBLE" knob "BALANCE" knob "AUDI MUTE" switch "PWER N/FF" switch "TREBLE" knob "BALANCE" knob Fig. MAIN DIRECT ( = ) Input selector LED / Binary number (BCD) [Lit:, ff: ] / LINE ( = ) LINE ( = 8) CD ( = ) TUNER ( = ) PHN ( = ) Firmware version / Decimal number / V V V V V V V (8 + + = ) (8 + = ) (8 + + = ) (8 + + = ) (8 + + + = ) () ( + = )

A-S A-S Factory Reset Set back to the factory setting (INPUT: CD).. Turn the "BALANCE" knob clockwise fully and then while pressing down the "AUDI MUTE" switch, set the "PWER N/FF" switch to the N position. (Fig. ). The INPUT selector LED CD will light up and the normal operation will be restored. (Fig. ). Set the PWER N/FF switch to the FF position to end. "BALANCE" knob "AUDI MUTE" switch "PWER N/FF" switch "BALANCE" knob Fig.

A-S A-S SELF-DIAGNSTIC FUNCTIN / Protection Information Display When the power to this unit is turned on and the power indicator is flashing, the normal operation is not available because the protection function is at work. In that case, the protection information can be displayed by following procedures. However, the power supply relay (RY of FUNCTIN P.C.B.) does not turn on. peration procedures Turn the BALANCE knob counterclockwise fully and then while pressing down the AUDI MUTE switch, set the PWER N/FF switch to the N position. PWER indicator "BALANCE" knob "PWER N/FF" switch "BALANCE" knob "AUDI MUTE" switch List of protection information The type of protection function is indicated by the flashing pattern of the PWER indicator. Types of protection function / PWER indicator flashing pattern / : Lit / : ff / Normal (no protection function) / Lit / Continuous PS protection / Flashing / ms ms ms ms ms ms ms ms ms ms ms PS AMP protection / / Flashing / ms ms ms ms ms ms ms ms ms ms ms ms AMP DC protection L/R ch / HP DC protection L/R ch / Flashing / Flashing / ms ms ms ms ms ms ms ms ms ms ms ms ms ms ms ms ms ms ms ms ms ms ms ms I protection L/R ch / Flashing / ms ms ms ms ms ms ms ms ms ms ms ms TMP protection L/R ch / Flashing / ms ms ms ms ms ms ms ms ms ms ms ms ms

A-S A-S Details of Protection Information PS (Power Supply) protection Cause : The voltage in the power supply section is abnormal. Normal value :.8 to.v Detection port : PRV (FRNT P.C.B. pin of microprocessor IC) Detected at : CB, CB and CB of power transformer, +8V, +C of FUNCTIN P.C.B., MC ±V, MM ±V, LINE ±V, LINE ±V, VL ±V and VL ±V of FRNT P.C.B. PS AMP source protection / Cause : Abnormal voltage of amplifier power source Normal value : LW (V) Detection port : PSVA (FRNT P.C.B. 8pin of microprocessor IC) PSVA (FRNT P.C.B. pin of microprocessor IC) Detected at : PSVA (CB and CB of power transformer) PSVA (±B, ±B, ±B and ±B of MAIN P.C.B.) Amplifier DC voltage protection L/Rch Cause : Abnormal DC voltage of amplifier output L/R Normal value :. to.8v Detection port : PRDL (FRNT P.C.B. pin of microprocessor IC) PRDR (FRNT P.C.B. pin of microprocessor IC) Detected at : PRDL (Amplifier output Lch of MAIN P.C.B.) PRDR (Amplifier output Rch of MAIN P.C.B.) Headphone DC voltage protection L/Rch Cause : Abnormal DC voltage of headphone output L/R Normal value :.9 to.v Detection port : HPPRDL (FRNT P.C.B. pin of microprocessor IC) HPPRDR (FRNT P.C.B. pin of microprocessor IC) Detected at : PRDL (Headphone amplifier output Lch of MAIN P.C.B.) PRDR (Headphone amplifier output Rch of MAIN P.C.B.) I protection L/Rch Cause : Excess current flow into amplifier Normal value : LW (V) Detection port : PRIL (FRNT P.C.B. pin of microprocessor IC) PRIR (FRNT P.C.B. pin of microprocessor IC) Detected at : PRIL (Amplifier output Lch of MAIN P.C.B.) PRIR (Amplifier output Rch of MAIN P.C.B.)

A-S A-S TMP protection L/Rch Cause : Abnormal temperature of heat sink Normal value :. to.v Detection port : THML (FRNT P.C.B. pin of microprocessor IC) THMR (FRNT P.C.B. pin of microprocessor IC) Detected at : PRDL (Heat sink temperature detection Lch IC of MAIN P.C.B.) PRDR (Heat sink temperature detection Rch IC of MAIN P.C.B.) Starting in the Protection Cancel mode CAUTIN! If this product is used with a failure un-repaired and the protection function disabled, the protection function does not work even in a dangerous state, possibly resulting further in damage. Use special care when using this mode. When the protection function works due to an I protection L/Rch, it is not possible to start this unit with the protection function cancelled. If the protection function works and causes hindrance to trouble shoot, it will be possible to start this unit in the protection cancel mode by following procedures. peration procedures Turn the BALANCE knob counterclockwise fully and then while pressing down the AUDI MUTE switch, set the PWER N/FF switch to the N position. At this time, keep pressing down the AUDI MUTE switch for seconds or longer. The PWER indicator lights up and the power supply relay (RY of FUNCTIN P.C.B.) turns on. PWER indicator "BALANCE" knob "PWER N/FF" switch "BALANCE" knob "AUDI MUTE" switch 8

IC DATA IC: M89xxxxx (FRNT P.C.B.) Single chip 8-bit microprocessor A-S A-S Main Main clock clock Sub-clock Sub-clock input output input output Reset input XIN XUT XCIN XCUT VSS VCC RESET CNVSS 8 9 Data bus MICRPRCESSR Clock generating circuit RAM RM A Timer (8) X Y S CNTR Prescaler (8) Prescaler X (8) Timer (8) Timer X (8) PCH PCL Prescaler Y (8) Timer Y (8) PS CNTR Timer Z () CNTR A/D converter () PWM (8) SI/ (8) SI/ (8) D/A converter (8) D/A converter (8) SI/ (8) P (8) INT P (8) P (8) INT INT INT INT P (8) P (8) P (8) INT INT P (8) 8 9 8 9 8 9 8 9 8 9 8 9 VREF AVSS I/ port P I/ port P I/ port P I/ port P I/ port P (LED drive) I/ port P I/ port P THM_L 8 PSVA PRD_R PSVA PRD_L EXAD RY_SPA MDEL RY_SPB EXCL /ICEX C /CSEX B EV_CE 8 A EV_CL EV_DA 9 9 STBY_CNT REM EX_DI 8 EXDT _RTS MVL+ _CTS MVL- _TXD RY_HP _RXD RY_UNBAL RY_PWR RY_BAL_GAIN PWR_DET CNVSS /RESET PRI_R PRI_L XIN XUT VSS LED_PWR RY_CD RY_TU RY_L RY_L MUTE_PRE MUTE_REC RY_BAL 9 8 9 THM_R HP_PRDR HP_PRDL EX_DI PRV AVSS VREF VCC RY_PHN RY_MMMC RY_BYP RY_DIR EV_MT EV_DA EV_CL EV_CE M89xxxxx 8 9 8 9 9

A-S A-S P-/AN P-/AN P-/AN P-/INT P-/PWM P-/CNTR P-/CNTR P-/SRDY P-/SCLK P-/SUT P-/SIN P-/SRDY/CNTR SRDY P-/SCLK SCLK P-/TXD P-/RXD P-/INT P-/INT CNVSS /RESET P-/INT/Xcin P-/INT/Xcout XIN XUT VSS P-/(LED) P-/(LED) P-/(LED) P-/(LED) P-/(LED) P-/(LED) P-/(LED) P-/(LED) P- P- P- P- P- P- P-/INT P-/INT P-/AN P-/AN P-/AN P-/AN 8 9 8 9 8 9 8 9 THM_L PRD_R PRD_L RY_SPA RY_SPB /ICEX /CSEX EV_CE EV_CL EV_DA EX_DI _RTS _CTS _TXD _RXD RY_PWR PWR_DET CNVSS /RESET PRI_R PRI_L XIN XUT VSS LED_PWR RY_CD RY_TU RY_L RY_L MUTE_PRE MUTE_REC RY_BAL RY_BAL_GAIN RY_UNBAL RY_HP MVL- MVL+ EXDT REM STBY_CNT A B C EXCL AD AD AD I S SI IRQ MCU MCU IRQ IRQ MCU MCU MCU IRQ Detail of Function Pin No. Port Name Function Name (P.C.B.) I/

A-S A-S 8 9 8 9 Detail of Function Pin No. Port Name Function Name (P.C.B.) I/ AD AD DA MCU MCU MCU AD SI AD AD AD MDEL EXAD PSVA PSVA EV_CE EV_CL EV_DA EV_MT RY_DIR RY_BYP RY_MMMC RY_PHN VCC VREF AVSS PRV EX_DI HP_PRDL HP_PRDR THM_R P-/AN P-/AN P-P/AN9 P-/AN8 P-/SRDY P-/SCLK P-/TXD P-/RXD P- (open drain) P- (open drain) P-/DA P-/DA VCC VREF AVSS P-/AN P-/AN P-/AN P-/AN P-/AN

A-S A-S IC: LC9A (FRNT P.C.B.) Serial parameter extension Pin No. Port Name Function Name (P.C.B.) I/ Detail of Function 9 8 9 8 P P P P P P P P VDDP P P P P P P P P VSS RES# VDD CS# CLK# DIN DUT LED_CD LED_TU LED_L LED_L LED_BAL LED_PHN LED_MDIR LED_MUTE VDDP SW_TRE SW_BAS I_HP I_SW_BAL_GAIN I_MUTE I_MMMC VSS /RES VDD /CS /CLK DIN DUT I I I I I FUNCTIN LED CD FUNCTIN LED TUNER FUNCTIN LED LINE FUNCTIN LED LINE FUNCTIN LED BALANCE FUNCTIN LED PHN FUNCTIN LED MAIN_DIRECT LED MUTE Treble control Bass control Initial clear extended IC Detect head phone insert, H: HP non inserted / L: HP inserted Balance gain select SW Detect switch for MUTE Detect switch MMMC, Hi: MC / Low: MM IC: TCHCAFEL (FRNT P.C.B.) 8-channel analog multiplexer/demultiplexer Pin No. Port Name Function Name (P.C.B.) I/ Detail of Function 9 8 VCC A B C GND VEE INH CM +STBY SP_AB HPTRIM CNTR_TAP LRBAL A B C MG MG MG TNE_BAS TNE_TRE EXAD I_SEL I_VL I I I I I I I I SP_AB rotary SW HP_TRIM rotary SW TREBLE, BASS, L/R BALANCE reference of center TAP LR_BALANCE volume AD BASS volume AD TREBLE volume AD CM out Function selector rotary SW AD MAIN VLUME AD

PIN CNNECTIN DIAGRAMS ICs A-S A-S BA8F LB LC9A-TLM-E LMCIZ LME9MA 8 +VS VUT GND 8 M89xxxxx NEDR NJM8MD-TE NJM8M-TE NJM8FA 8 9 8 8 8 : IN : CM : UT NJM9FA RHRE8AA-T-FA TCHCAFEL TC9A8UG : CMMN : INPUT : UTPUT : Vin : GND : Vout 8 Diodes NS SS Anode SS SS8 Anode T Anode DXB- RSM-B-C-J8 Cathode Cathode Cathode + ACAC MA8.V MA8-L.9V MA8-L.V MA8-M.V MA8.V MA8-L.V MA8-M.V MA89-L 8.8V MA8-H.V MA8-M.V MA8.V MA8-L.V MA8-M.V MA88-H 8.V MA8-M.V MA8-H.V MA8-M.V Cathode Anode HZSC.V CATHDE ANDE RBQ- Anode RLS Anode SNB.A V Cathode Cathode AC AC +

A-S A-S Transistors SA9 SAK SAK SA8 SC SD98F SC88 SC88 SA-GR,BL SA SC C C E C B B E B E E C B B C E SA8 SA8 ST SCS SC8 S SCK SC9 SC8 ST C E C B B C E B C E E C B B E SC-GR,BL SC8 SC8,P,Y SK8-Y SK9 C G G B E B C E B C E S D D S SK9 HPC-TB-E DTAEKA DTCEKA DTCEKA KRAS-RTK KRCS-RTK D G S D G S : GND : IN : UT UT IN CMMN

A B C D E F G H I J A-S BLCK DIAGRAM FRNT See page 9- SCHEMATIC DIAGRAM VLUME & TNE CNTRL IC IC ATT. TNE CNTRL DEVICES FUNCTIN See page - SCHEMATIC DIAGRAM FLATING BALANCED PWER AMPLIFIER FRNT See page 9- SCHEMATIC DIAGRAM PHN L/R RY_MMMC CD L/R TUNER L/R LINE L/R LINE PB L/R RY LINE REC UT L/R Q- MM/MC MC HEAD AMP Q-8 RY EQ AMP IC RY_PHN PL/PR RY RY_CD RY_TU RY_L RY_L INPUT SELECTR BUFFER AMP. INPUT BUFFER IC ATT. IC ATT. IC IC FLAT RY_BYP RY LINE AMP. IC CLD(-) HT(+) RY_DIR RY MAIN DIRECT RY SPEAKER DRIVER SPEAKER DRIVER HT (PSITIVE PHASE) SIDE CLD (NEGATIVE PHASE) SIDE SPCH A L/R CH RY/R SPCH B L/R CH RY/R RY_SPA RY_SPB to PWER AMP. R CH SPEAKERS L/R CH + - + - A B PRE UT IC PRD PRI THM MAIN IN IC IC RY PHNES FRNT PRD RY_DIR RY_BYP, RY_UNBAL RY_BAL RY_CD RY_TU RY_L 8 RY_L 9 RY_MMMC RY_PHN LED_PWR REMTE 9 REM See page 9- SCHEMATIC DIAGRAM SP_AB THM HP_PRD PSVA PSVA, I_BAS MICR PRCESSR IC I_TRE, IC, I_LRBAL I_SEL 8 A/B/C - 9- SPEAKER TREBLE INPUT SEL BASS BALANCE VLUME VR FRNT PANEL I_VL, MVL+/- PRV PRV RY_PWR RY_HP RY_SPA RY_SPB for MICRPRCESSR For MC AMP +V/-V For EQ AMP +V/-V For LINE AMP +V/-V For LINE AMP +V/-V For VLUME +/-V For VLUME +V/-V INDEPENDENT REGULATED PWER SUPPLY (for AUDI) SUB-TRANSFRMER AC IN PDET FUNCTIN T PWER SWITCH See page - SCHEMATIC DIAGRAM +V -V RY D D PRV (for PWER AMP / VLTAGE AMP STAGE) PRV BALANCE UNBALANCE CNVERTER PWER TRANSFRMER HP END LW IMPEDANCE DRIVE HEADPHNE AMP. INDEPENDENT FLATING PWER SUPPLY PRV D D D D D L CH for HT RY_HP L CH for CLD R CH for HT IC IC R CH for CLD +B/-B +B/-B +B/-B +B/-B +V -V PSVA PSVA to SPEAKERS RELAY JK MAIN See page 8 SCHEMATIC DIAGRAM FUNCTIN See page - SCHEMATIC DIAGRAM

A B C D E F G H I J A-S PRINTED CIRCUIT BARDS FUNCTIN () P.C.B. (Side A) R INPUT LINE CD TUNER LINE PB REC MAIN IN PRE UT L L/R L/R L/R L/R L/R L/R FRNT () (CB9) CB IC 8 IC 8 IC 8 T, K, B, G models RY_SPA+ RY_SPB+ -C W W W MBAL_L+ AGND MBAL_L- AGND MBAL_R+ AGND MBAL_R- AGND FUNCTIN () (CB) W W W W CB 8 IC CB RY_CD RY_TU RY_L RY_L MT_PRE MT_REC RY_BAL I_BALGAIN RY_UNBAL MG RY_MMMC I_MMMC RY_PHND Semiconductor Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location D C IC H Q D Q9 E Q E D C IC H Q8 D Q E Q F D F Q I Q9 D Q F D G Q I Q D Q F D G Q G Q C Q F D H Q G Q D Q9 F IC G Q I Q C Q E IC H Q I Q D Q F FUNCTIN () (CB) E R E L E LINE+V LINEGND LINEGND LINE-V VGND VGND NC PE+ AGND AGND FUNCTIN () (CB) PE- -RY PR AGND PL R E L FUNCTIN () (CB8) FRNT () (W) RY_MMMC RY_PHN -RY I_MMMC MG PREUT_L+ AGND PREUT_L- AGND PREUT_R+ AGND PREUT_R- FRNT () (W) FUNCTIN () (CB) Circuit No. C8, X : NT USED : USED/APPLICABLE RY_SPA+ RY_SPB+ -C FUNCTIN () (W) FRNT () (CB9) U, C, R, A, L, J T, K, B, G X

A B C D E F G H I J A-S FUNCTIN () P.C.B. (Side B) Semiconductor Location Ref no. Location Ref no. Location Ref no. Location D D D F D F D D D D D F D8 D D8 E D8 E D9 C D F D9 C D D D F D E D D D E D C

A B C D E F G H I J A-S FRNT () (W) LINE+V LINEGND LINEGND LINE-V VGND VGND VL+V VLGND VL-V VL+V VLGND VL-V LINE+V LINEAGND LINE-V FUNCTIN () P.C.B. (Side A) FUNCTIN () (W) Semiconductor Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location D9 F D E D C D F Q D Q E Q9 E Q9 I Q C Q9 I D D D G D C IC E Q D Q D Q H Q G Q8 C D8 D D H D B IC F Q D Q D Q G Q H Q9 B D9 D D B D H IC H Q D Q E Q G Q I Q I D D D C D H IC E Q E Q E Q H Q H Q D D D D H D I IC F Q8 E Q D Q I Q B Q G D E D8 G D J IC H Q9 E Q D Q I Q C Q H D E D9 C D J IC J Q D Q8 E Q I Q C Q8 H FUNCTIN () (W) AGND L AGND R AGND PREUT_R- AGND PREUT_R+ AGND PREUT_L- AGND PREUT_L+ AGND MBAL_R- AGND MBAL_R+ AGND MBAL_L- AGND MBAL_L+ FUNCTIN () (W) AGND AGND FUNCTIN () (W) FRNT () (CB) FRNT () (CB) RY_DIR RY_BYP EV_MT EV_CE EV_CL EV_DA MT_M -RY SW_TRE SW_BAS EV_CE EV_CL EV_DA MG W PHL AGND PHR CB CB8 W LINE+V LINEGND LINEGND LINE-V VGND VGND NC PE+ AGND AGND PE- -RY CB CB IC IC IC 8 8 IC IC IC 8 IC FUNCTIN () (W) CB CB CB CB Circuit No. C, X : NT USED : USED/APPLICABLE U, C, R, A, L, J T, K, B, G X MAIN () (W) INR- INR- E INR+ INR+ AGND MAIN () (W) 8

A B C D E F G H I J A-S FUNCTIN () P.C.B. (Side B) Semiconductor Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location D C D E D G Q C D E D E D G Q8 I D D C C D8 D G H D D H H Q Q D I 9

A B C D E F G H I J A-S FRNT () (CB) FUNCTIN () P.C.B. (Side A) +M PDET /RES RY_PWR MG 9V +C DGND -C PRV RY_SPA RY_SPB PSAV PSAV MG U, C, T, K, A, B, G, J models R, L models CB W PSVA PSVA MG +M PRV MAIN () (W) CB Brown Black Brown PWER TRANSFRMER R, L models PWER N/FF switch FRNT () (W8A, W8B) R, L models GY CB BR CB PRMSW PRMSW WA WB UT CM IC IN UT CM IC IN CB PWER TRANSFRMER U, C, T, K, A, B, G, J models WB BR WA GY W W RY_SPA+ RY_SPB+ -C Circuit No. C CB J WA, WB X : NT USED : USED/APPLICABLE U, C, T, K, A, B, G, J R, L X X X X AC IN RY_SPA+ RY_SPB+ -C FRNT () (CB9) FUNCTIN () (CB) Semiconductor Location Ref no. Location D9 E D E D G IC F IC G Q F Q F Q G Q G Q G Q G

A B C D E F G H I J A-S FUNCTIN () P.C.B. (Side B) R, L models R, L models Semiconductor Location Ref no. Location D E D E D E D D D D D E D E D8 D D D D D D G Q E Q E Q D Q E Q D Q8 D

A B C D E F G H I J A-S MAIN () P.C.B. (Side A) MAIN () (W) MAIN () (CB) -PB +PB RIDL_P RIDL_N AGND AGND CB GND UT IC VCC MAIN () (CB) CB W INR+ AGND INR- +M MG THMR HPRRDR PRIR PRDR W FUNCTIN () (CB) -B +B +B -B MAIN () (WA-WD) CB CB8 CB CB RSP_P RSP_N CB CB9 FRNT () (WA, WB) Semiconductor Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location D H D9 D Q G Q B D H D G Q H Q C D G D H Q G Q C D H IC F Q8 G Q B D H Q H Q9 G Q B D D Q G Q G Q G D E Q I Q D Q8 H D8 D Q H Q D Q9 H MAIN () P.C.B. (Side A)

A B C D E F G H I J A-S MAIN () P.C.B. (Side B) MAIN () P.C.B. (Side B) Semiconductor Location Ref no. Location D F D C Q D Q8 D

A B C D E F G H I J A-S MAIN () P.C.B. (Side A) MAIN () (WA-WD) -B +B +B -B MAIN () (W) +PB AGND AGND -PB RIDL_P RIDL_N MAIN () (CB) +M MG THMR HPRRDR PRIR PRDR MAIN () (W) GND UT IC VCC CB FUNCTIN () (CB) INL- AGND INL+ W CB CB CB W +M MG THMR THML HPPRDR HPPRDL PRIR PRIL PRDR PRDL FRNT () (CB) CB8 CB LSP_P LSP_N FRNT () (WA, WB) CB8 CB8 CB9 MAIN () P.C.B. (Side A) Semiconductor Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location D C D8 G Q D Q I D C D9 G Q C Q H D C D E Q D Q H D D IC E Q8 D Q I D C Q C Q9 D Q I D C Q D Q D Q D D G Q B Q G Q8 C D G Q C Q G Q9 D

A B C D E F G H I J A-S MAIN () P.C.B. (Side B) MAIN () P.C.B. (Side B) Semiconductor Location Ref no. Location D E D H Q G Q8 G

A B C D E F G H I J A-S MAIN () P.C.B. (Side A) Safety measures Some internal parts in this product contain high voltages and are dangerous. Be sure to take safety measures during servicing, such as wearing insulating gloves. Note that positions indicated below are dangerous even after the power is turned off because an electric charge remains and a high voltage continues to exist there. Before starting any repair work, perform discharge by connecting a discharge resistor (k-ohms/ W) between terminals at following positions. The time required for discharging is about seconds.. C8 on MAIN () P.C.B... C9 on MAIN () P.C.B... C on MAIN () P.C.B... C on MAIN () P.C.B.. FUNCTIN () (CB) PSVA PSVA MG +M PRV W k-ohms W k-ohms W WD WC -B MAIN () BL +B (CB) BE MAIN () PWER TRANSFRMER IC (CB) BE PWER TRANSFRMER WC WD BL +B -B Blue Brown Black Red Blue Brown Black Red CB CB WA -B BR GY WB IC WB +B GY CB CB RED Black RED +B BR WA Violet White Violet PWER TRANSFRMER IC -B PWER TRANSFRMER Semiconductor Location Ref no. Location Ref no. Location D H D D D H D D D G D D D G D D D D D D D H D G D G D8 G D8 G D9 G D G D G D G D D D G D D D G D D D F D D D D IC F D D IC G D D IC F D8 D IC F D D Q F W8 MAIN () (CB) +PB AGND AGND -PB W k-ohms W k-ohms W MAIN () (CB) +PB AGND AGND -PB IC W W PRV +V AGND -V GND FRNT () (CB)

A B C D E F G H I J A-S MAIN () P.C.B. (Side B) Semiconductor Location Ref no. Location D9 F D F D9 E D E Q F Q F Q F Q8 E Q E

A B C D E F G H I J A-S FRNT () P.C.B. FUNCTIN () (W) (Side A) RY_DIR RY_BYP EV_MT EV_CE EV_CL EV_DA MT_M -RY SW_TRE SW_BAS EV_CE EV_CL EV_DA MG CB PINT A- XL (Pin of IC) (Writing port) RY_CD RY_TU FRNT () (CB9) FUNCTIN () (W) RY_L RY_L MT_PRE MT_REC RY_BAL I_BALGAIN RY_UNBAL MG RY_MMMC RY_PHND I_MMMC CB9 LED_MT LED_MDIR NC LED_CD LED_L LED_L LED_PH LED_TU DGND +C Semiconductor Location Ref no. Location Ref no. Location D D D8 D D IC IC IC IC Q Q Q G G I D A E C E E E D B Q Q Q8 Q Q Q Q9 Q Q Q C D C D E D D B E D FRNT () P.C.B. (Side A) B A+B BI-WIRING SPEAKERS A FF PHNES JK CB IC MAIN () (W) +M MG THMR THML HPPRDR HPPRDL PRIR PRIL PRDR PRDL CB CB 8 9 IC A- 9 IC IC 8 A- W CB CB I_CNTR I_LRBAL I_BAS I_TRE MG +STBY I_MMMC I_MUTE I_ISEL MVL- MVL+ DGND I_VL +C FUNCTIN () (W) FRNT () P.C.B. CB HPR HPG HPL (Side A) CB -C RY_HP I_HP SP_AB NC REM MG +M LED_PWR +M W -C RY_HP I_HP SP_AB NC REM MG +M BALANCE TREBLE BASS FRNT (9) P.C.B. (Side A) PWER indicator PINT A- / Pin, / Pin of CB FUNCTIN () (W) +M PDET /RES RY_PWR MG 9V +C DGND -C PRV RY_SPA RY_SPB PSAV PSAV MG R L + - + - WA WA W9A W8 W LED_PWR +M CB (+V) CB (/RES) CB (+V) CB (/RES) MVL- MVL+ MG I_VL +STBY DGND +C FRNT () (WB) I_ISEL MG NC FRNT () (WB) I_MUTE +STBY FRNT () (W9B) I_CNTR I_LRBAL I_BAS I_TRE MG +STBY I_MMMC I_MUTE I_ISEL MVL- MVL+ DGND I_VL +C PWER N PWER FF PWER N 8

A B C D E F G H I J A-S FRNT () P.C.B. (Side B) FRNT () P.C.B. (Side B) FRNT () P.C.B. (Side B) FRNT (9) P.C.B. (Side B) Semiconductor Location Ref no. Location Ref no. Location D E Q D D D D D D C C C Q Q Q Q9 B B C D D D C C Q Q D E D D C C Q Q8 D B D D B B Q Q D D D D C C Q Q D B Q Q8 D D Q Q8 B B Q9 B 9

A B C D E F G H I J A-S FRNT () P.C.B. (Side A) FRNT () P.C.B. (Side A) FRNT () P.C.B. (Side A) INPUT indicator +C DGND +STBY I_VL MG MVL+ MVL- WB VLUME FRNT () (WA) I_ISEL MG NC WB INPUT FRNT () (W) LED_MT LED_MDIR NC LED_CD LED_L LED_L LED_PH LED_TU DGND +C CB9 LINE CD TUNER MAIN DIRECT LINE PHN AUDI MUTE indicator FRNT () (WA) IC M + FRNT () P.C.B. (Side A) FRNT () P.C.B. FRNT () (W9A) I_MUTE +STBY AUDI MUTE W9B (Side A) MAIN () (W) PRV +V AGND -V VGND CB FUNCTIN () (CB) LINE+V LINEGND LINEGND MC+V MC-V MM+V MM-V AGND LINE-V CB W VGND VGND VL+V VLGND VL-V VL+V FRNT () (W) VLGND VL-V LINE+V LINEAGND LINE-V Semiconductor Location Ref no. Location D F D8 H D9 G D H D8 I D9 J D I D I D I D H D I IC B Q G Q H Q G Q8 H Q G Q H Q G Q H Q G Q H Q G Q9 H Q G Q H Q F Q H

A B C D E F G H I J A-S FRNT () P.C.B. (Side B) FRNT () P.C.B. (Side B) FRNT () P.C.B. (Side B) FRNT () P.C.B. (Side B) FRNT () P.C.B. (Side B) Semiconductor Location Ref no. Location D G D H D B Q G Q H

A B C D E F G H I J A-S Semiconductor Location FRNT () P.C.B. (Side A) Ref no. Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location D H D9 E Q D Q G Q F Q8 E D H Q9 D Q C Q F Q G Q9 C D E Q D Q C Q F Q F Q D D E Q C Q G Q G Q H Q F D D Q C Q8 F Q8 F Q G Q G R PHN L D8 F Q D Q G Q G Q F MM/MC SWITCH U, C, R, T, A, L, J models W W W FRNT () (CB) MC+V MC-V MM+V MM-V AGND PR AGND PL FUNCTIN () (CB) MG I_MMMC -RY RY_PHN RY_MMMC FUNCTIN () (CB)

A B C D E F G H I J A-S FRNT () P.C.B. (Side B) Semiconductor Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location D G D G Q D Q G D E Q D Q D Q E D C Q D Q C Q E D D Q C Q8 C Q9 G D F Q C Q9 G Q F K, B, G models

A B C D E F G H I J A-S FRNT () P.C.B. (Side A) FRNT () P.C.B. (Side A) FRNT () P.C.B. (Side A) R, L models FUNCTIN () (W) RY_SPA RY_SPB -V CB9 WA WB BRWN RSP_P BLACK RSP_N MAIN () (CB) RY_SPA RY_SPB -V CB9 BRWN LSP_P WB BLACK LSP_N WA MAIN () (CB8) WH VLTAGE SELECTR WD WF W8B WH YE VLTAGE SELECTR -V V V V -, - -, - -, -8 -, 8- FUNCTIN () (W) GY WC WE VI FUNCTIN () (CB) RE WB W8A BE WA CB8 CB WG R BE K, B, G models K, B, G models PWER TRANSFRMER Semiconductor Location Ref no. Location FRNT () P.C.B. (Side B) FRNT () P.C.B. (Side B) FRNT () P.C.B. (Side B) D D A C R, L models - - + + A SPEAKER TERMINAL R B A SPEAKER TERMINAL L B + + - -

A B C D E F G H I J K L M N SCHEMATIC DIAGRAMS FUNCTIN / A-S W CB...9...9....... CB CD L.9.9..9.. -.8 -.8 -.8 -. -. -. -. -. -. -. -..... W W W -. -. -. -. -. -.. -. -.............. W.. -.... -. -. -. -.. -. -. -. -. -. W -.. -. IC. -. IC IC -..9. IC -.9 W -. 8. IC IC IC IC -.8 -. CB 9 -. -. -. -. -. All voltages are measured with a MΩ/V DC electronic voltmeter. Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed. Schematic diagram is subject to change without notice.

A B C D E F G H I J K L M N A-S FUNCTIN / Page K to FUNCTIN ()_W Page K to FUNCTIN ()_W CB CB.... -.. -.. -..... IC IC IC IN L s s s s s. IC -. s IC s. IC -. s IC s. IC -. s IC s s s s s... -. -.. -... -. -. UT L....9.9.9.9.9........9.9.9.9.9.9.......9..9.9.9....8...9.9.9.9........... -... -. -. -. -..... -. -.. -. -. -. -.. -.8 -. -.8 -... -. -. -...... -. -. -. -.. -.. -. -. -.8.. -. -...... -. -. -.... -. -. -.8 -. -. -. -.... -.... -.. -... IC IC -.9.9 CB W CB CB CB CB8 CB -. -. -. -.. W. -.. -. -. 8 FUNCTIN () 9 IC-: NEDR Dual low-noise operational amplifiers IC-: LME9MA Dual high fidelity audio operational amplifier IC-: TC9A8UG Electronic volume control L-MVR-AGND L-MVR-UT L-TVR-UT L-TVR-IN L-TVR-REF NC 9 8 R-TVR-REF R-TVR-IN R-TVR-UT R-MVR-UT R-MVR-AGND IC: BA8F Dual high slew rate, low noise operational amplifier UT IN IN+ V CC 8 V CC+ UT IN IN+ IN+ IN pf pf pf pf VCC+ Ω UT Ω UTPUT A INVERTING INPUT A NN-INVERTING INPUT A A B - + + - 8 V + UTPUT B INVERTING INPUT B L-MVR-AGND L-MVR-IN L-ZX-AGND L-ZX-IN L-SW-UT 8 L-SW-IN 9 Latch Latch Zero crossing detection circuit Latch Decoder -bit shift register Latch Decoder Latch Latch Zero crossing detection circuit R-MVR-AGND R-MVR-IN R-ZX-AGND 9 R-ZX-IN 8 R-SW-UT R-SW-IN UT IN + IN VEE ch + ch + 8 VCC UT L-SW-IN R-SW-IN All voltages are measured with a MΩ/V DC electronic voltmeter. Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed. Schematic diagram is subject to change without notice. L-SW-IN L-SW-IN TEST VDD R-SW-IN R-SW-IN NC VSS SS IN + IN Latch Latch Ω VCC V - NN-INVERTING INPUT B Test and Power N reset Timing gene Level shift 8 9 SS CS CS MUTEM GND TC MUTE CK DATA STB s s s s s s s s s Page 8 A to MAIN ()_W Page 9 C9 to FRNT ()_CB Page 8 A8 to MAIN ()_W Page K to FUNCTIN ()_W Page G to FRNT ()_W Page K to FUNCTIN ()_W Page K to FUNCTIN ()_W Page 9 K to FRNT ()_CB

A B C D E F G H I J K L M N A-S FUNCTIN / Page D9 to FRNT ()_W8A, W8B (R, L models) mm P To PWER TRANSFRMER (U, C, T, K, A, B, G, J models) WA CB WB.................. CB CB.9. 8. 9. 8... 8.9.. AC IN.. 8... WA WB PWER N/FF switch W.8. AC8. Page 9 B to FRNT ()_CB CB s s C C C C R R UR8 / V89 P UR / HF /P UR / HF /P UR / HF /P UR / HF /P UR / HF /P UR / HF /P Page 8 L to MAIN ()_W To PWER TRANSFRMER CB AC9.8-9. -9.. IC 9.. 9..9.. W s s s s s C9 C C C C C C9 C9 C C C C8 C C C8 C IC IC IC R R WK8 / UR8 / UU / YA89A LME9MA V89 P WM98./ UR / WM98./ X8A NEDR HF /P WM98./ UR / WM98./ X8A NEDR HF /P WM98./ UR / WM98./ X8A NEDR HF /P WM98./ UR / WM98./ X8A NEDR HF /P WM98./ UR / WM98./ X8A NEDR HF /P WM98./ UR / WM98./ X8A NEDR HF /P. Page K 8.9.9 -. to FUNCTIN ()_CB -. W Page H to FRNT ()_CB9-9.. IC: NJM8FA Voltage regulator IC: NJM9FA Voltage regulator IC INPUT R Q Q Q Q R R CMMN 9 UTPUT CMMN D Q Q Q D Q R R R R R Q R Q8 R8 Q9 R9 Q R Q Q R Q Q9 R C Q Q Q8 Q C Q R C R Q Q R R R R Q D R R R9 Q R8 UTPUT INPUT FUNCTIN () All voltages are measured with a MΩ/V DC electronic voltmeter. Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed. Schematic diagram is subject to change without notice.

A B C D E F G H I J K L M N A-S MAIN F to MAIN ()_CB Page M to FUNCTIN ()_CB W MAIN () Ground point............9....9.9.9...9.. -9.8 -...9 -. CB M to MAIN ()_W MAIN ().......... -. -. -.. -.. -. -.8 -. Idling adjustment Page H to FRNT ()_WA, WB.9 -. -. -. -.9 #. -.9. -. # -.9. -. CB CB.9.8 CB9 CB...... # #. -.9. -.9 -. -. -. -..9.9 -. -. -. -.. -. # -.9. -. CB CB # -.9 F to MAIN ()_CB.9.. -. -. -.. -.9 -. IC.9..9... -. -.9 CB CB8. W W To PWER TRANSFRMER To PWER TRANSFRMER AC8. AC8. DC. DC. CB CB WC WD WB WA k-ohms W CB k-ohms W -. AC. -. -.. -.8.9 To PWER TRANSFRMER CB.... -.. -. IC W. -.. -. IC -. -. AC.. -.. -.. -8.8.. -.. AC.. -. IC. -... -. IC. -... CB -. -. -8. -. -. -.. AC.. -. -. W W W8 W WC WD WB WA DC.9 DC.9 Page Page A to FRNT ()_CB C to FUNCTIN ()_CB To PWER TRANSFRMER k-ohms W k-ohms W C to MAIN ()_CB.8 MAIN () Idling adjustment..8 IC.9. W Page 9 K8 to FRNT ()_CB CB W CB CB CB -8.8 -. -. MAIN () -. -. -. -. -. -. -8. -. -......8.................... -.9 -.. UT L Page H8 to FRNT ()_WA, WB CB8 CB9 CB8.8...8.. -9. -. 8 Page M to FUNCTIN ()_CB W Ground point........8 -.8 -.9 -... -.8 -. -. -. -.9.. # # -.9. -... # -.9.. -.9.. -. -... # # -.9.. -.9 -. -. -. -..9. -.9. -. #. -.. -.8 -. -. -. -.9 IC, : LMCIZ Temperature sensor -. -. -. -. CB CB8 9 MAIN () All voltages are measured with a MΩ/V DC electronic voltmeter. Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed. Schematic diagram is subject to change without notice. Note) Those parts marked with # are not included in the P.C.B. ass y. Safety measures Some internal parts in this product contain high voltages and are dangerous. Be sure to take safety measures during servicing, such as wearing insulating gloves. Note that positions indicated below are dangerous even after the power is turned off because an electric charge remains and a high voltage continues to exist there. Before starting any repair work, perform discharge by connecting a discharge resistor (k-ohms/w) between terminals at following positions. The time required for discharging is about seconds.. C8 on MAIN () P.C.B... C9 on MAIN () P.C.B... C on MAIN () P.C.B... C on MAIN () P.C.B... MAIN P.C.B.. MAIN P.C.B.. MAIN P.C.B.. MAIN P.C.B. 8

A B C D E F G H I J K L M N A-S FRNT / PINT A- XL (Pin of IC) PINT A- / Pin, / Pin of CB Writing port FRNT (9) CB (+V) CB (/RES) CB (+V) CB (/RES) CB CB W. PWER indicator PWER N PWER FF PWER N. W CB9 INPUT indicator TUNER PHN LINE LINE CD..... MAIN DIRECT AUDI MUTE.. FRNT ()....... IC. FRNT ()..8...8. FRNT () WA WB. IC. VLUME..8..........9....9.8... A- CB...... MICR PRCESSR IC.8.....8........ IC... FRNT ().9.9... WA WB... A-.9..... Page C to FUNCTIN ()_W...9.....9... CB W8 W9A WA INPUT SELECTR W9B WB AUDI MUTE FRNT () IC: TCHCAFEL 8-channel analog multiplexer/demultiplexer A B C INH Logic Level Converter CM UT C IN UTC IN CM INH VEE GND 8 Vcc A B 9 C IC.8. TREBLE +/- BASS +/- BALANCE L/R IC: LB Motor driver..8.8.. CB P UT VCC UT P VCC 8 9 IC: RHRE8AA-T-FA Voltage regulator.....9 Page M8 to FUNCTIN ()_W PRE DRIVER VZ VIN + VUT. -..9. -..9. -..9. -. IN INPUT LGIC IN Vref GND GND CB9....... FRNT ().9 -.. -..9.9 -. -..9.9 -..9 Page K8 to FUNCTIN ()_W IC: LC9A-TLM-E I/-expander for microcontroller DIN Serial/parallel converter/shift register DUT.. CLK# CS# Control logic VDD 9 VSS CB W CB RES# I/ control/output register 8 SPEAKERS FF A B A+B....... Page 8 K to MAIN ()_W port I/ buffer port I/ buffer 8.. P P P P CB -. IC: M89xxxxx Single chip 8-bit microprocessor CB.. -. Main Main clock clock Sub-clock Sub-clock input output input output Reset input XIN XUT XCIN XCUT VSS VCC RESET CNVSS 8 9 Data bus 9 PHNES JK JK -. -. CB Page M to FUNCTIN ()_W.. -. FRNT () Clock generating circuit A/D converter () PWM (8) RAM RM SI/ (8) SI/ (8) MICRPRCESSR PCH A X Y S PCL PS D/A converter (8) D/A converter (8) SI/ (8) CNTR CNTR CNTR Timer (8) Prescaler (8) Timer (8) Prescaler X (8) Timer X (8) Prescaler Y (8) Timer Y (8) Timer Z () All voltages are measured with a MΩ/V DC electronic voltmeter. Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed. Schematic diagram is subject to change without notice. P (8) 8 9 INT INT INT INT P (8) P (8) INT P (8) 8 9 8 9 8 9 P (8) 8 9 P (8) 8 INT INT P (8) 9 VREF AVSS I/ port P I/ port P I/ port P I/ port P I/ port P (LED drive) I/ port P I/ port P 9