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Pioneer M-LA21 Service Manual

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STEREO POWER AMPLIFIER
M-LA21
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Model
Type
M-LA21
DBDXCN
DDXCN/AR
¶ This product is a system(s) component.
This product does not function properly independently ; to avoid malfunctions, be
sure to connect it to the prescribed system component(s), otherwise damage may
result.
¶ Please connect it to the STEREO CD TUNER XC-LA21, for operation inspection.
¶ System component Table
Component
COMPACT MINI COMPONENT
STEREO CD TUNER
STEREO POWER AMPLIFIER
SPEAKER SYSTEM
CONTENTS
1. SAFETY INFORMATION ....................................... 2
3. SCHEMATIC DIAGRAM .......................................... 6
4. PCB CONNECTION DIAGRAM ........................... 12
5. PCB PARTS LIST ................................................ 18
6. ADJUSTMENT ..................................................... 19
PIONEER CORPORATION
PIONEER ELECTRONICS SERVICE, 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
c
PIONEER CORPORATION 2000
Power Requirement
AC110-127V / 220-230V / 240V
AC110-127V / 220-230V / 240V
Model
X-LA21
XC-LA21
M-LA21
S-LA21
4-1, Meguro 1-chome, Meguro-ku, Tokyo 153-8654, Japan
DYNAMIC MODE
HIGH EFFICIENT
AMPLIFIER
POWER OUTPUT
DINAMIC
- OFF _ ON
LA21
STEREO POWER AMPLIFIER
The voltage can be converted by
the following method.
With the Voltage Selector
With the Voltage Selector
Service manual
RRV2370
RRV2392
RRV2393
This manual.
RRV2394
7. GENERAL INFORMATION ................................ 20
7.1 DIAGNOSIS .................................................. 20
7.1.2 DISASSEMBLY .................................... 21
ORDER NO.
RRV2393
Remarks
T - IZK OCT. 2000 Printed in Japan

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  Summary of Contents for Pioneer M-LA21

  • Page 1: Table Of Contents

    PIONEER CORPORATION 4-1, Meguro 1-chome, Meguro-ku, Tokyo 153-8654, Japan PIONEER ELECTRONICS SERVICE, 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 PIONEER CORPORATION 2000 T –...
  • Page 2: Safety Information

    The use of a substitute replacement component which does Leakage 0.5mA current Device not have the same safety characteristics as the PIONEER tester under recommended replacement one, shown in the parts list in test this Service Manual, may create shock, fire, or other hazards.
  • Page 3: Exploded Views And Parts List

    M-LA21 2. EXPLODED VIEWS AND PARTS LIST • NOTES: Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List. • mark found on some component parts indicates the importance of the safety factor of the part.
  • Page 4 M-LA21 2.2 EXTERIOR SECTION 33(×3) DDXCN/AR Only DDXCN/AR Only DBDXCN Only...
  • Page 5 505PMT372000 AC Cord Label See Contrast table (2) Mounting Bracket 505266422000 Power Knob 510PMT312001 (2) CONTRAST TABLE M-LA21/DBDXCN and DDXCN/AR are constructed the same except for the following : Part No. Mark No. Symbol and Description M-LA21 M-LA21 Remarks /DBDXCN...
  • Page 6: Schematic Diagram

    M-LA21 3. SCHEMATIC DIAGRAM 3.1 OVERALL WIRING DIAGRAM POWER METER ASSY (PMT1LA100081) (PH) From XC-LA21 IC504 JACK ASSY BA4558N (PMT1LA100021) SPEAKER IC601 RL601 STK411-230 PLY-DPDT POWER AMPLIFIER AMP ASSY (PMT1LA100011)
  • Page 7 M-LA21 Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST". : AUDIO SIGNAL ROUTE LED ASSY (PH) : AUDIO SIGNAL ROUTE (PHONES) (PMT1LA100051) (PH) (PH) PHONES HP JACK ASSY...
  • Page 8 M-LA21 3.2 AMP, TRANSFORMER and PRIMARY ASSYS AMP ASSY (PMT1LA100011) 010-550411-000A BA4558DX MTZJ6.2A BA4558DX 003-030840-050 MTZJ6.2A 003-030840-050 018-030036-300A 004-022410-100 011-020602-001A 018-030036-300A 006-033200-63D 004-022410-100 006-033200-80D NJM78M12FA NJM79M12FA CN602 136-08PMT3-200J CN22...
  • Page 9 M-LA21 : AUDIO SIGNAL ROUTE (L ch) : AUDIO SIGNAL ROUTE (PHONES) CN604 136-07PMT3-202J BA4558DX Q610 DTA114YS 008-801144-000A BZ605 MTZJ3.0A 128-1221125-000 BZ604 MTZJ3.0A 010-024001-000A BA4558DX TRANSFORMER ASSY (PMT1LA100031) WH601 025-230041-000A 136-05PMT3-350J 011-024001-000A 124063020001 025-230041-000A CN603 136-06PMT3-200J 006-033200-63D 124010020001 124025020001 1236C0250140...
  • Page 10 M-LA21 3.3 JACK, POWER METER, LED and HP JACK ASSYS JACK ASSY (PMT1LA100021) 004-056210-100 IC504 135-053259-040J BA4558DX CN23 004-033210-100 004-056210-100 JK501 118-000134-003J IC502 BA4558DX MTZJ12B MTZJ9.1C...
  • Page 11 M-LA21 : AUDIO SIGNAL ROUTE (L ch) : AUDIO SIGNAL ROUTE (PHONES) POWER METER ASSY (PMT1LA100081) CN11 136-11PMT3-200J HP JACK ASSY HP JACK ASSY (PMT1LA100111) SW501 : DYNAMIC CN602 CN12 136-17PMT3-200J JK503 116-008020-000 CN20 135-053259-040J 021-022322-000A IC502 BA4558DX 110-033040-013A CN17...
  • Page 12: Pcb Connection Diagram

    M-LA21 4. PCB CONNECTION DIAGRAM 4.1 AMP ASSY AMP ASSY R670 NOTE FOR PCB DIAGRAMS : WH601 • Part numbers in PCB diagrams match those in the schematic diagrams. • The parts mounted on this PCB include all necessary parts for several destinations.
  • Page 13 M-LA21 CN23 Q609 EC617 Q608 EC618 RL601 WH602 SPKR R672 R671 D613 CN604 R661 SPKCTL HPRCH SPKL HPGND R652 HPLCH CTL GND R654 L+R SIG PWRCTL R602 EC630 W602 D615 EC602 C636 EC615 R604 Q604 EC620 C602 C637 R607 R681 BLK.
  • Page 14 M-LA21 4.2 TRANSFORMER and PRIMARY ASSYS PRIMARY ASSY F329 F328 PRIMARY DANGER PMT1LA-01-04 PRIMARY BOARD R308 GND. D311 PWRCTL RL301 F321 L301 C315 SIDE A AC IN...
  • Page 15 M-LA21 TRANSFORMER ASSY PMT1LA-01-03 F322 TRANSFORMER BOARD PRIMARY DANGER PWRCTL MUTE 16VAC2 16VAC1 F323 CN603 CN10 F324 F325 ACVH1 ACVL1 ACGND ACVL2 ACVH2 WH601 F327 F326 SIDE A...
  • Page 16 M-LA21 4.3 JACK ASSY JACK ASSY CN11 CN602 FOR NON-KARAOKE TO EC522 "BOND" EC527 R592 EC525 R572 EC524 R593 R507 Q511 EC559 EC535 R589 Q516 Q514 R598 R590 R599 EC549 Q515 R567 EC526 R597 EC528 R579 ECHOSIG1 TO EC523 "BOND"...
  • Page 17 M-LA21 4.4 POWER METER, LED and HP JACK ASSYS LED ASSY POWER METER ASSY CN11 ECHOS1 +12V ECHOS2 VOLGND MICS2 -12V CN16 MICS1 MIC GND MIC SW DYNAMIC +12V METER LED GND HP Lch HP GND HP Rch HP SW...
  • Page 18: Pcb Parts List

    M-LA21 Mark No. Description Part No. Mark No. Description Part No. 5. PCB PARTS LIST • NOTES: Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List. • mark found on some component parts indicates the importance of the safety factor of the part.
  • Page 19: Adjustment

    M-LA21 Mark No. Description Part No. Mark No. Description Part No. JP WIRE AWG26 50MM R 051-675050-006J PRIMARY ASSY JP WIRE AWG26 50MM B 051-675050-009J CN23 HEDER MOLEX 4PINS 53 135-053259-040J SEMICONDUCTOR D311 (RECTIFIER IN-4001B) 011-024001-000A RELAY • SWITCH POWER METER ASSY...
  • Page 20: General Information

    M-LA21 7. GENERAL INFORMATION 7.1 DIAGNOSIS 7.1.1 SINGLE OPERATION METHOD Please supply +9V from DC power supply to the following point. PRIMARY ASSY F329 F328 PRIMARY DANGER PMT1LA-01-04 PRIMARY BOARD R308 GND. D311 PWRCTL RL301 DC power supply F321 DC+9V...
  • Page 21: Disassembly

    M-LA21 7.1.2 DISASSEMBLY × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 Mounting Bracket Front Panel Side Panel L (Remove it as Side Panel R in the same way.) × 4 Remove it of R side in the ×...
  • Page 22 M-LA21 Transformer Bracket Diagnosis JACK Assy LED Assy AMP Assy POWER METER Assy HP JACK Assy TRANSFORMER Assy PRIMARY Assy...
  • Page 23: Panel Facilities And Specifications

    M-LA21 8. PANEL FACILITIES AND SPECIFICATIONS 8.1 PANEL FACILITIES Front Panel DYNAMIC MODE HIGH EFFICIENT AMPLIFIER POWER OUTPUT DINAMIC — OFF _ ON LA21 STEREO POWER AMPLIFIER PHONES socket – Plug in a pair of headphones POWER OUTPUT meter – Shows the output level for private listening.
  • Page 24 M-LA21 8.2 SPECIFICATIONS Power Section & Miscellaneous Power Requirements ......AC 110-127/220-230/240 V (switchable), 50/60 Hz Power Consumption (ON mode) (Total including XC-LA21) ......538 W Power Consumption (Standby mode) ......1 W Dimensions Stereo power amplifier ..160(W) x 176(H) x 315(D) mm Weight Stereo power amplifier ..........