Pioneer M-LA21 Service Manual
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Pioneer M-LA21 Service Manual

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3 7 63 1515 0
STEREO POWER AMPLIFIER
M-LA21
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Model
Type
M-LA21
DBDXCN
TE
L 13942296513
¶ 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
www
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
http://www.xiaoyu163.com
Power Requirement
AC110-127V / 220-230V / 240V
Model
X-LA21
XC-LA21
M-LA21
S-LA21
x
ao
u163
y
i
4-1, Meguro 1-chome, Meguro-ku, Tokyo 153-8654, Japan
http://www.xiaoyu163.com
2 9
8
DYNAMIC MODE
HIGH EFFICIENT
AMPLIFIER
POWER OUTPUT
DINAMIC
- OFF _ ON
LA21
STEREO POWER AMPLIFIER
Q Q
3
6 7
1 3
1 5
Service manual
RRV2370
RRV2392
RRV2393
This manual.
RRV2394
7. GENERAL INFORMATION ................................ 20
7.1 DIAGNOSIS .................................................. 20
7.1.2 DISASSEMBLY .................................... 21
co
.
9 4
2 8
ORDER NO.
PROVISIONAL
The voltage can be converted by
the following method.
With the Voltage Selector
0 5
8
2 9
9 4
2 8
Remarks
m
T - IZK OCT. 2000 Printed in Japan
9 9
9 9

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  • 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 3 7 63 1515 0 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 3 7 63 1515 0 2.2 EXTERIOR SECTION 33(×3) L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 5 M-LA21 3 7 63 1515 0 • EXTERIOR SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. AMP Assy PMT1LA100011 Voltage Selector Knob 510PMT319000 TRANSFORMER Assy PMT1LA100031 Side Panel-L 600PMT117002 PRIMARY Assy PMT1LA100041 Side Panel-R...

  • Page 6: Schematic Diagram

    M-LA21 3 7 63 1515 0 3. SCHEMATIC DIAGRAM 3.1 OVERALL WIRING DIAGRAM POWER METER ASSY (PMT1LA100081) (PH) L 13942296513 From XC-LA21 IC504 JACK ASSY BA4558N (PMT1LA100021) SPEAKER IC601 RL601 STK411-230 PLY-DPDT POWER AMPLIFIER u163 AMP ASSY (PMT1LA100011) http://www.xiaoyu163.com...
  • Page 7 M-LA21 3 7 63 1515 0 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)
  • Page 8 M-LA21 3 7 63 1515 0 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 L 13942296513 018-030036-300A 004-022410-100 011-020602-001A 018-030036-300A 006-033200-63D 004-022410-100 006-033200-80D NJM78M12FA NJM79M12FA u163 CN602 136-08PMT3-200J CN22 http://www.xiaoyu163.com...
  • Page 9 M-LA21 3 7 63 1515 0 : 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 L 13942296513 TRANSFORMER ASSY (PMT1LA100031) WH601 025-230041-000A 136-05PMT3-350J 011-024001-000A...
  • Page 10 M-LA21 3 7 63 1515 0 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 L 13942296513 118-000134-003J IC502 BA4558DX MTZJ12B MTZJ9.1C u163 http://www.xiaoyu163.com...
  • Page 11 M-LA21 3 7 63 1515 0 : 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 L 13942296513 CN602 CN12 136-17PMT3-200J JK503...

  • Page 12: Pcb Connection Diagram

    M-LA21 3 7 63 1515 0 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 3 7 63 1515 0 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...
  • Page 14 M-LA21 3 7 63 1515 0 4.2 TRANSFORMER and PRIMARY ASSYS PRIMARY ASSY F329 F328 L 13942296513 PRIMARY DANGER PMT1LA-01-04 PRIMARY BOARD R308 GND. D311 PWRCTL RL301 F321 L301 C315 SIDE A u163 AC IN http://www.xiaoyu163.com...
  • Page 15 M-LA21 3 7 63 1515 0 TRANSFORMER ASSY PMT1LA-01-03 F322 TRANSFORMER BOARD PRIMARY DANGER PWRCTL MUTE 16VAC2 16VAC1 F323 CN603 CN10 F324 F325 ACVH1 ACVL1 ACGND L 13942296513 ACVL2 ACVH2 WH601 F327 F326 SIDE A u163 http://www.xiaoyu163.com...
  • Page 16 M-LA21 3 7 63 1515 0 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...
  • Page 17 M-LA21 3 7 63 1515 0 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 L 13942296513 LED GND...

  • Page 18: Pcb Parts List

    M-LA21 3 7 63 1515 0 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.

  • Page 19: Adjustment

    M-LA21 3 7 63 1515 0 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 •...

  • Page 20: General Information

    M-LA21 3 7 63 1515 0 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 L 13942296513 PRIMARY BOARD R308 GND.

  • Page 21: Disassembly

    M-LA21 3 7 63 1515 0 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.) ×...
  • Page 22 M-LA21 3 7 63 1515 0 Transformer Bracket L 13942296513 Diagnosis JACK Assy LED Assy AMP Assy POWER METER Assy HP JACK Assy TRANSFORMER Assy PRIMARY Assy u163 http://www.xiaoyu163.com...

  • Page 23: Panel Facilities And Specifications

    M-LA21 3 7 63 1515 0 8. PANEL FACILITIES AND SPECIFICATIONS 8.1 PANEL FACILITIES Front Panel DYNAMIC MODE HIGH EFFICIENT AMPLIFIER L 13942296513 POWER OUTPUT DINAMIC — OFF _ ON LA21 STEREO POWER AMPLIFIER PHONES socket – Plug in a pair of headphones POWER OUTPUT meter –...
  • Page 24 M-LA21 3 7 63 1515 0 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 ..

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