Pioneer A-70DA-K Service Manual
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Pioneer A-70DA-K Service Manual

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INTEGRATED AMPLIFIER
A-70DA-K
A-70DA-S
A-50DA-K
A-50DA-S
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Model
A-70DA-K/-S
SYXEV8
A-50DA-K/-S
SYXEV8
PIONEER CORPORATION
PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936
Onkyo & Pioneer Corporation 2015
Type
Power Requirement
AC 220 V to 230 V
AC 220 V to 230 V
1-1, Shin-ogura, Saiwai-ku, Kawasaki-shi, Kanagawa 212-0031, Japan
A-70DA-K
K-FZV OCT.
ORDER NO.
RRV4622
Remarks
2015 Printed in Japan

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  • Page 1 PIONEER CORPORATION 1-1, Shin-ogura, Saiwai-ku, Kawasaki-shi, Kanagawa 212-0031, Japan PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A. PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936 Onkyo &...

  • Page 2: Table Of Contents

    3. BASIC ITEMS FOR SERVICE...............................4 3.1 CHECK POINTS AFTER SERVICING..........................4 3.2 PCB LOCATIONS ................................5 3.3 JIGS LIST..................................6 4. BLOCK DIAGRAM.................................7 4.1 OVERALL CONNECTION DIAGRAM (A-70DA-K, A-70DA-S) ..................7 4.2 OVERALL CONNECTION DIAGRAM (A-50DA-K, A-50DA-S) ..................8 4.3 BLOCK DIAGRAM ................................9 5. DIAGNOSIS..................................10 5.1 TROUBLESHOOTING ..............................10 5.2 PROTECTION CIRCUIT DESCRIPTION........................16...

  • Page 3: Specifications

    •RIAA DEVIATION • “Pioneer” is a trademark of Pioneer Corporation, and is used under license. PHONO (MM) ....20 Hz to 20 kHz ±0.5 dB* PHONO (MC) .

  • Page 4: Basic Items For Service

    Check scratch or taint is not generated after accepting the repair See the table below for the items to be checked regarding audio. Item to be checked regarding audio Distortion Noise Volume too low Volume too high Volume fluctuating Sound interrupted A-70DA-K...

  • Page 5: Pcb Locations

    3.2 PCB LOCATIONS VOLUME ASSY FRONT ASSY GUARD16 ASSY AC LINE ASSY FUNCTION LED ASSY (A-70DA-K, A-70DA-S only) HEADPHONE ASSY SECOND POWER FUNCTION ASSY SW ASSY D-POWER AMP MAIN ASSY INPUT ASSY D-POWER AMP SUB ASSY CONNECTOR ASSY (A-70DA-K, A-70DA-S only)

  • Page 6: Jigs List

    CUP12818Z-13 2..PHONO ASSY CUP12820Z-2E 2..GUARD14 ASSY • • • • • 2..GUARD15 ASSY • • • • • 1...D-AMP MAIN ASSY (A-70DA-K/-S) COP12821B 2..GUARD16 ASSY • • • • • 2..D-POWER AMP MAIN ASSY VUP12821ZB 2..GUARD17 ASSY • • • • •...

  • Page 7: Block Diagram

    4. BLOCK DIAGRAM 16 PIN 16 PIN XLR ASSY CJP03GI236ZW 10 PIN 10 PIN 3 PIN CUP12820Z-3B (A-70DA/SYXEV8) CJP09GA294K CJP09GA295K 1/3 - CJP16HJ358I CJP16GI359I CJP10GI359I CJP10HJ358I POWER ASSY D-POWER AMP MAIN ASSY CUP12818Z-7B VUP12821ZB CJP16GI359I CJP02GA89ZY (A-70DA/SYXEV8) 16 PIN 1/2 - 2 PIN 16 PIN PHON0 ASSY...

  • Page 8: C 4.2 Overall Connection Diagram (A-50Da-K, A-50Da-S)

    16 PIN 16 PIN CJP03GI236ZW 10 PIN 10 PIN 3 PIN CJP09GA294K CJP09GA295K 1/3 - CJP16HJ358I CJP16GI359I CJP10GI359I CJP10HJ358I POWER ASSY D-POWER AMP MAIN ASSY CUP12818Z-7E VUP12821ZC CJP02GA89ZY (A-50DA/SYXEV8) 1/2 - 2 PIN PHON0 ASSY USB ASSY 24 PIN 24 PIN SUB-TRANS CUP12820Z-2E CJP10GA297I...

  • Page 9: Block Diagram

    FRONT POWER Tone Balance Input Selecter Power SW STB LED Blue LED Sub Trans secandary DC IC91 IC92 +3.3V +5V Reg SR I/O FLASH MAIN SMALL SIGNAL C C M6632 µ COM RELAY 384kHz/32bit DSD5.6M HPAMP COAX PCM/DSD DA model only +7.5V +18V +15V...

  • Page 10: Diagnosis

    ON ?  S805 failure  IC11 failure IC7252 failure Is the voltage between Is the voltage of R7457 disconnection both terminals of V-12RY2 approx. -12V ? C4071, C4171 at 8.5V ? Q7201-Q7206: failure RY4000,RY4100: failure R7589,R7590,R7592,R7598 : disconnection A-70DA-K...
  • Page 11 IC4100 failure or check of the CN4006 : 8 pin power supply Check of the connection between CN4007 and CN5002 Check of the connection between CN4107 and CN5102 Check of the connection between CN4006 and CN5001 Check of the connection between CN4106 and CN5101 A-70DA-K...
  • Page 12  Main unit POWER SW: ON  POWER ON operation by remote control unit  Select SPEAKER-A No sound (PHONO input)  INPUT : PHONO(MM or MC) A-70DA-K, A-70DA-S only Whether H/L Whether H/L Whether H/L Is there output operate the voltage...
  • Page 13 Check of the power supply CN83 : 19,21 pins ? (C517 is between plus and minus : aprrox. 10V) 21p FFC connection failure CN83(USB ASSY, FRONT ASSY) : solder failure  Connection failure between BN88 and CN88 JK81 solder failure or failure A-70DA-K...
  • Page 14 Please be measured using the tester. Is the voltage of C4199 side of R4182 and Replace D-POWER AMP SUB ASSY C4299 side of R4282 at 9V or more ? Return to the 1) No sound A-70DA-K...
  • Page 15 8) No sound (XLR input : A-70DA-K, A-70DA-S only) [Status of product]  Insert AC Power cord  Main unit POWER SW: ON  POWER ON operation by remote control unit No sound (XLR input)  Select SPEAKER-A  INPUT : BALANCED Is there a signal at RY2101,RY2201(INPUT ASSY ) failure or check of the power supply...

  • Page 16: Protection Circuit Description

    1.5 ZOBEL PROTECTION MUTE ON & PROTECTION RELAY OFF are carried out immediately after the detection and the power is turned OFF. After ZOBEL is detected, the key operation is not prohibited (the power supply can be turned ON). A-70DA-K...

  • Page 17: Service Mode

    (Blinking : 5 times) Zobel (XDSABL) interval : 2.0Sec Protection (Blinking : 6 times) Power (XB) Protection interval : 2.0Sec ( Can't power-on) (Blinking : 7 times) 6. SERVICE MODE There is no information to be shown in this chapter. A-70DA-K...

  • Page 18: Disassembly

    Note 3 : Before starting the diagnosis, wait for three minutes until the electricity of the unit is discharged. [1] Disassembly [1-1] Exterior Top Cabinet [1-1-1] Top Cabinet, Side Panel (Case of A-70DA-K, A-70DA-S) (1) Remove the six screws, using the hex key (2.5mm). ( A-70DA-K: CHD1A080FFZRP ) ( A-70DA-S: CHD1A080FFCP ) (2) Remove the three screws.

  • Page 19: Top Cabinet

    (1) If the Short Pin Plug is attached, remove it. (2) Remove the four sets of Cover Sheet and Screw Cushion. Note on assembling Attach the new Cover Sheets and new Screw Cushions. Short Pin Plug Cover Sheet and Screw Cushion A-70DA-K...

  • Page 20: (Case Of A-70Da-K, A-70Da-S)

    [Case of A-70DA-K, A-70DA-S] (3) Remove the two screws. (VTB3+6JR) (4) Remove the rear side 35 screws and then remove the Rear Panel. VTB3+6JFZR VTB3+8JFZR VTB3+10JFZR x 16 CTB4+10GFZR VTN3+6JFZR Rear Panel [Case of A-50DA-K, A-50DA-S] (3) Remove the rear side 31 screws and then remove the Rear Panel.
  • Page 21 ----------------------------------------------------------------- (1) [ A-70DA-K, A-70DA-S: MP 1st lot only] Remove the screw. (VTB3+6JR) XLR ASSY (2) [ A-70DA-K, A-70DA-S only] Disconnect the connector and then remove the XLR ASSY. CONNECTOR ASSY (3) [ A-70DA-K, A-70DA-S only] Remove the screw. (VTB3+6JR)
  • Page 22 D-POWER AMP MAIN ASSY (3) Remove the four screws. (VTB3+6JR) (4) Slide the D-POWER AMP MAIN ASSY (with CN4201 the D-POWER AMP SUB ASSY) to the rear side and remove it. CN4000 CN4200 D-POWER AMP SUB ASSY Front • Top view A-70DA-K...
  • Page 23 (CHD2A060R) on the side-A of D-POWER AMP SUB ASSY. (8) Remove the Heat Sink (with the Heat Sink Sheet) by removing the two screws. Heat Sink (CHD2A060R) D-POWER AMP SUB ASSY (side-B) Heat Sink Sheet Insulator (PC,CU,PC) Heat Sink A-70DA-K...
  • Page 24 SR Cable (3) Release the 21P FFC from the PCB binders. CN89 POWER ASSY ( A-70DA-K, A-70DA-S: Four ) Front ( A-50DA-K, A-50DA-S: Two ) (4) Disconnect the two connectors. (5) Pull out the 21P FCC from the slit of...
  • Page 25 Note: [ A-50DA-K, A-50DA-S only] When you carry out the diagnosis of Front Section, it is not necessary to unscrew these two screws. [ Case of A-50DA-K, A-50DA-S ] [ Case of A-70DA-K, A-70DA-S ] Trans Bracket HEAPHONE ASSY Trans Bracket Front Chassis...
  • Page 26 [2] Diagnosis Remove the Front Section. (Refer to the “ [1-4] Front Section”. ) ----------------------------------------------------------------- [Case of A-70DA-K, A-70DA-S] (1) Remove the five screws. (VTB3+10JR) (2) Remove the FUNCTION LED ASSY. (3) Remove the Funktion Knob and Standby Indicators from the Sub Panel.
  • Page 27 < Turn the mark to the topside > • Before assembling them, turn the Encoder Axis by hand, and confirm that you feel center-click. If you don't feel it, replace the part. Encoder Axis < Turn the flat side to the bottom > A-70DA-K...
  • Page 28 ∗2: Silicon Bond should not be applied on this part because boss touches here. FRONT ASSY ∗2 Volume Bracket (2) Connect the GND Cables to the Volume Bracket. ∗3: Fix the GND Cable shown above here. FRONT ASSY ∗3 A-70DA-K...

  • Page 29: Side Panel L

    [4-1-2] Case of A-70DA-K, A-70DA-S (1) Primary Side Cables of the Power Trans ∗1: Does not contact the Primary Side Cables Side Frame Primary Side Cable of ∗1 with metal. Power Trans (Pri) Do not contact it with the case of Power ∗1...
  • Page 30 ∗10: Do not connect the 21P FFC (Shielded) with the case of Power Trans (Pri) and Center Frame R, using the two PCB Binders. ∗10 21P FFC (Shielded) Center Frame R ∗10 PCB Binder 21P FFC (Shielded) Power Trans (Pri) A-70DA-K...

  • Page 31: Case Of A-50Da-K, A-50Da-S

    ∗3: Do not contact the Secondary Side Cable of Power Trans with metal. Do not contact it with the Power Trans, Center Frame L and Heat Sink, using the Power Trans PCB Binder. ∗3 ∗3 ∗3 PCB Binder Heat Sink POWER ASSY A-70DA-K...
  • Page 32 Center Frame L Center Frame R Wire Clamp Secondary Side Cable of Power Trans ∗6 Wire Clamp ∗7 Bottom Chassis PHONO ASSY Center Frame R Center Frame R PCB Binder ∗7 ∗6 Secondary Side Cable of Power Trans Bottom Chassis A-70DA-K...

  • Page 33: Top Cabinet

    Tape, order a new Tape and attach it. (You can use other Tape than that designated by cutting it to a designated size.) (1) Top Cabinet Acetate Tape x4 10 x 17.5mm ∗1: [Case of A-70DA-K, A-70DA-S] (CHS1A032, cut into four equal portions) Attach the four pieces of Himelon Tape (Part No.: CHS1A032, 10 x 70mm, cut...
  • Page 34 (Part No.: CHS1A217, 10 x 15mm) to the specified position on the lateral side of Electric Volume as shown in the photo. ∗1 ∗2: [A-70DA-K, A-70DA-S only] ∗3 Attach a piece of Acetate Tape VOLUME ASSY (side-B) (Part No.: CHS1A217, 10 x 15mm) to the VOLUME ASSY almost center of square shape.
  • Page 35 (3) Acetate Tape [Case of A-70DA-K, A-70DA-S] ∗1: Attach the 13 pieces of Acetate Tape (Part No.: CHS1A217, 10 x 15mm) as 40mm shown in the photo. ∗2: Attach the two pieces of Acetate Tape ∗1 (Part No.: C4FS101BL) as shown in the photo.
  • Page 36 ∗6: Attach the three pieces of Acetate Tape Touch the Stopper Pin ∗6 (Part No.: CHS1A217, 10 x 15mm) to the inner side of Volume Knob as shown in Attach in the almost center the photo. About 120 degree ∗6 Volume Knob ∗6 About 120 degree A-70DA-K...
  • Page 37 Center Frame R.) Center Frame L Attach in the center ∗1 ∗1 35mm 35mm 40mm 40mm ∗1 ∗1 Attach in the center Attach in the center ∗1 ∗1 40mm ∗1 40mm 29mm 64mm 40mm ∗1 ∗1 38mm ∗1 35mm 65mm A-70DA-K...
  • Page 38 (5) Himelon Tape (A-70DA-K, A-70DA-S only) More than 10mm ∗1: Attach the two pieces of Himelon Tape (Part No.: CHS1A032, 70 x 10mm) as Front Chassis shown in the photo. ∗1 Attach it by folding it to the rear side so that the edge of hole is covered.
  • Page 39 [4-4] Attach the Volume Knob (Case of A-70DA-K, A-70DA-S) (1) Rotate the Volume Shaft to MIN side fully. Sub Panel Volume Shaft (2) Attach the Volume Knob to the Volume Shaft at the position where the Stopper Pin of Volume Knob does not enter the protrusion of Sub Panel.
  • Page 40 Sub Panel ∗2 Volume Knob Volume Knob [4-5] Attach the Side Panel, Top Cabinet (A-70DA-K, A-70DA-S only) [4-5-1] Side Panel R, Side Panel L Front Section (1) Remove the two screws. ( A-70DA-K: VTB3+8JFZR ) ( A-70DA-S: VTB3+8JFC ) •...

  • Page 41: ( A-70Da-K: Chd1A080Ffzrp ) ( A-70Da-S: Chd1A080Ffcp )

    -1 and (VTB3+6JR) (4) Tighten the two screws in order of -1 and ( A-70DA-K: CHD1A080FFZRP ) ( A-70DA-S: CHD1A080FFCP ) (5) Attach the Side Panel on the opposite side following the steps (3) and (4). Side Panel R (6) Pull out the tool inserted in the gap between the Panel (AL) and Front Chassis.

  • Page 42: ( Vtb3+6Jfzr )

    Top Cabinet the three screws on rear side. ( VTB3+6JFZR ) (3) Tighten the six screws. ( A-70DA-K: CHD1A080FFZRP ) ( A-70DA-S: CHD1A080FFCP ) [4-6] Direction of Foot • Bottom view (1) Align the mark at under surface of the Foot with the direction of photo.

  • Page 43: Each Setting And Adjustment

    7 SPEAKER A 8 SPEAKER B 9 LOUDNESS 10 ATTENUATOR OFF (A-70DA-K, A-70DA-S only) 8.2 FIRMWARE UPDATING [Necessary Tool]  Firmware  PC with a serial port (For PC without a serial port, a commercially-available USB serial conversion cable is also available) ...
  • Page 44 Mode (Completed). 9. Quit the update application and disconnect the AC Cord. 10. Disconnect UPDATE JIG and assembling the Top Cabinet. LED display at update Power LED Debug Mode (Updating) Standby LED Power LED Debug Mode (Completed) Standby LED A-70DA-K...
  • Page 45 A-70DA-K...

  • Page 46: Exploded Views And Parts List

    Parts marked by “NSP” are generally unavailable because they are not in our Master Spare Parts List. The > mark found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing, be sure to use parts of identical designation. 9.1 PACKING SECTION Tape Tape A-70DA-K...
  • Page 47 NSP 11 Warranty Card • • • • • 12 Operating Instructions VQX1A1939Z 13 Serial Label • • • • • (2) CONTRAST TABLE A-70DA-K/SYXEV8, A-70DA-S/SYXEV8, A-50DA-K/SYXEV8 and A-50DA-S/SYXEV8 are constructed the same except for the following: A-70DA-K/SYXEV8 A-70DA-S/SYXEV8 A-50DA-K/SYXEV8 A-50DA-S/SYXEV8 Mark No.
  • Page 48 -5/6 : 1st lot only -4/6 -2/2 -2/2 -1/2 -1/6 -6/6 : Refer to “9.4 FRONT SECTION” -3/6 Double side tape Refer to -2/6 “9.4 FRONT SECTION” -1/2...

  • Page 49: Exterior Section (A-70Da-K, A-70Da-S)

    30 Short Pin Plug (PHONO) CJT1A100 61 Screw See Contrast table (2) 62 Screw VTN3+6JFZR (2) CONTRAST TABLE A-70DA-K/SYXEV8 and A-70DA-S/SYXEV8 are constructed the same except for the following: Mark No. Symbol and Description A-70DA-K/SYXEV8 A-70DA-S/SYXEV8 31 Top Cabinet CKC2A217B62...

  • Page 50: Exterior Section (A-50Da-K, A-50Da-S)

    9.3 EXTERIOR SECTION (A-50DA-K, A-50DA-S) -2/4 -3/4 -1/4 Refer to “9.4 FRONT SECTION -4/4 Refer to “9.4 FRONT SECTION ” A-70DA-K...
  • Page 51 A-50DA-K/SYXEV8 and A-50DA-S/SYXEV8 are constructed the same except for the following: Mark No. Symbol and Description A-50DA-K/SYXEV8 A-50DA-S/SYXEV8 26 Top Cabinet CKC2A218B62 CKC2A218G70 27 Rear Panel CKF1A505Z CKF1A505Y 28 Foot CKL1A204 CKL1A204H65 33 Screw VTB3+8JFZR VTB3+8JFC 42 Special Screw CHD1A080FFZRP CHD1A080FFCP A-70DA-K...

  • Page 52: Front Section

    9.4 FRONT SECTION [A-70DA-K, A-70DA-S] POWER ASSY CN89 Front Chassis USB ASSY -6/6 CN83 Trans Bracket -1/6 - 5/6 Refer to “9.2 EXTERIOR SECTION (A-70DA-K, A-70DA-S)” Accessory of Sub Panel USB ASSY BN81 Accessory of Lubricant Sub Panel Silicon Bond...
  • Page 53 See Contrast table (2) 18 Standby Indicator CGL1A297Z 19 Function Indicator CGL1A298Z 20 Power Indicator CGL1A301 (2) CONTRAST TABLE A-70DA-K/SYXEV8, A-70DA-S/SYXEV8, A-50DA-K/SYXEV8 and A-50DA-S/SYXEV8 are constructed the same except for the following: Mark No. Symbol and Description A-70DA-K/SYXEV8 A-70DA-S/SYXEV8 A-50DA-K/SYXEV8 A-50DA-S/SYXEV8...

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A-70da-sA-50da-kA-50da-s

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