Pioneer MLA-21 Service manual
DYNAMIC MODE
HIGH EFFICIENT
AMPLIFIER
POWER OUTPUT
DINAMIC
— OFF _ ON
LA21
STEREO POWER AMPLIFIER
STEREO POWER AMPLIFIER
M-LA21
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Type
DBDXCN AC110-127V / 220-230V / 240V With the Voltage Selector
DDXCN/AR AC110-127V / 220-230V / 240V With the Voltage Selector
Model
M-LA21 the following method.
Power Requirement
The voltage can be converted by
ORDER NO.
RRV2393
¶ 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 Model Service manual Remarks
COMPACT MINI COMPONENT X-LA21 RRV2370
STEREO CD TUNER XC-LA21 RRV2392
STEREO POWER AMPLIFIER M-LA21 RRV2393 This manual.
SPEAKER SYSTEM S-LA21 RRV2394
CONTENTS
1. SAFETY INFORMATION
.......................................
2. EXPLODED VIEWS AND PARTS LIST
3. SCHEMATIC DIAGRAM
4. PCB CONNECTION DIAGRAM
5. PCB PARTS LIST
6. ADJUSTMENT
.....................................................
..........................................
...........................
................................................
.................
12
18
19
2
3
6
7. GENERAL INFORMATION
7.1 DIAGNOSIS
..................................................
7.1.1 SINGLE OPERATION METHOD
7.1.2 DISASSEMBLY
8. PANEL FACILITIES AND SPECIFICATIONS
................................
....................................
.........
....
20
20
20
21
23
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
c
PIONEER CORPORATION 2000
T – IZK OCT. 2000 Printed in Japan
M-LA21
1. SAFETY INFORMATION
This service manual is intended for qualified service technicians ; it is not meant for the casual do-ityourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained
to properly and safely repair complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may
void the warranty. If you are not qualified to perform the repair of this product properly and safely, you
should not risk trying to do so and refer the repair to a qualified service technician.
WARNING
This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of California to cause
cancer, birth defects or other reproductive harm.
Health & Safety Code Section 25249.6 – Proposition 65
NOTICE
(FOR CANADIAN MODEL ONLY)
Fuse symbols (fast operating fuse) and/or (slow operating fuse) on PCB indicate that replacement parts must
be of identical designation.
REMARQUE
(POUR MODÈLE CANADIEN SEULEMENT)
Les symboles de fusible (fusible de type rapide) et/ou (fusible de type lent) sur CCI indiquent que les pièces
de remplacement doivent avoir la même désignation.
(FOR USA MODEL ONLY)
1. SAFETY PRECAUTIONS
The following check should be performed for the
continued protection of the customer and service
technician.
LEAKAGE CURRENT CHECK
Measure leakage current to a known earth ground (water
pipe, conduit, etc.) by connecting a leakage current tester
such as Simpson Model 229-2 or equivalent between the
earth ground and all exposed metal parts of the appliance
(input/output terminals, screwheads, metal overlays, control
shaft, etc.). Plug the AC line cord of the appliance directly
into a 120V AC 60Hz outlet and turn the AC power switch
on. Any current measured must not exceed 0.5mA.
Reading should
not be above
0.5mA
Earth
ground
Device
under
test
Also test with
plug reversed
(Using AC adapter
plug as required)
Leakage
current
tester
Test all
exposed metal
surfaces
ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL
SHOCK HAZARD AND MUST BE CORRECTED BEFORE
RETURNING THE APPLIANCE TO THE CUSTOMER.
2. PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in the appliance
have special safety related characteristics. These are
often not evident from visual inspection nor the protection
afforded by them necessarily can be obtained by using
replacement components rated for voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this Service Manual.
Electrical components having such features are identified
by marking with a
in this Service Manual.
The use of a substitute replacement component which does
not have the same safety characteristics as the PIONEER
recommended replacement one, shown in the parts list in
this Service Manual, may create shock, fire, or other hazards.
Product Safety is continuously under review and new
instructions are issued from time to time. For the latest
information, always consult the current PIONEER Service
Manual. A subscription to, or additional copies of, PIONEER
Service Manual may be obtained at a nominal charge from
PIONEER.
on the schematics and on the parts list
AC Leakage Test
2
2. EXPLODED VIEWS AND PARTS LIST
NOTES:• Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.
2.1 PACKING (X-LA21)
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.
Screws adjacent to mark on the product are used for disassembly.
•
20DDXCN/AR Only
19
16
M-LA21
9(1/2)
17
14
9(2/2)
10
3
6
5
2
7
SPEAKER
SYSTEM
TOP SIDETOP SIDE
1
4
13
FRONTFRONT
FRONTFRONT
10
11
11
15
XC-LA21
REAR
M-LA21
REAR
8(2/2)
12
12
8(1/2)
8(2/2)
12
8(1/2)
18
18
(1) PACKING PARTS LIST
Mark No. Description Part No.
1 AM Loop Antenna ANT-PMT1E-AL
2 Remote Control Unit AXD7289
3 RCA Audio Cable 122003220100
NSP 4 ‘AAA’ Size R03 Batteries 130115004000
5 FM Wire Antenna 132030001001
6 Power-cord Plug Conversion Adaptor
138011722000
7 Battery Door 500RC4603070
8 Polyform Unit 800PMT190001
9 Polyfoam (Speaker) 800PMT390000
10 Poly Foam Sheet (C) SP 801999000002
NSP 12 PE Polybag (AC Cord) 805032115000
11 Polythenefoam Sheet 801999000005
NSP 13 PE Polybag (Remocon) 805035105000
NSP 14 PE Polybag (Antenna) 805070100000
NSP 15 PE Polybag (I Book) 805085140000
16 Operating Instructions 811PMT391011
(English/Spanish/Chinese)
17 Carton See Contrast table (2)
18 Corrugate Card 815001405213
19 Additional Sheet 810PMT395010
20 Correction Sheet See Contrast table (2)
(2) CONTRAST TABLE
X-LA21/DBDXCN and DDXCN/AR are constructed the same except for the following :
Part No.
Mark No. Symbol and Description X-LA21 X-LA21 Remarks
/DBDXCN /DDXCN/AR
17 Carton 813PMT393020 813PMT393010
20 Correction Sheet Not used 810PMT395020
3
M-LA21
2.2 EXTERIOR SECTION
22
51
B
18
15
14
16
27
C
C
3
29
49
H
53
53
53
39
55
52
52
53
10
G
53
E
5
H
F
G
7
28
30
G
6
F
53
34
53
36
52
53
52
B
53
53
2
17
D
4
53
53
50
53
54
44
53
40
32
35
38
D
E
9
44
53
54
21
49
E
A
1
36
43
53
42
25
A
53
20
33(×3)
12
13
A
D
50
37
53
53
53
49
57
45
DDXCN/AR
Only
F
23
52
B
C
56
DDXCN/AR
Only
26
19
47
52
31
46
DBDXCN
Only
53
48
52
52
53
52
24
11
4
M-LA21
(1) EXTERIOR SECTION PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.
2 TRANSFORMER Assy PMT1LA100031
1 AMP Assy PMT1LA100011
3 PRIMARY Assy PMT1LA100041
4 JACK Assy PMT1LA100021
5 POWER METER Assy PMT1LA100081
6 LED Assy PMT1LA100051
7 HP JACK Assy PMT1LA100111
8 • • • • •
NSP 9 PROTECTION PCB PMT1LA100141
10 S-Assy PMT3 FP01 SUBPMT3AMFP
11 Meter Assy SUBPMT3MTR
NSP 12 Heat Sink Board 033PMT1LS100
13 DC Cord 122006020060
14 Transformer (TR701) 1236C0250140
15 Fuse 124010020001
(F322, F323 : T1AL/250V)
16 Fuse 124025020001
(F328, F329 : T2.5A/250V)
17 Fuse (F321 : T3.15A/250V) 124031520003
18 Fuse 124063020001
(F324-F327 : T6.3AL/250V)
19 AC Cord See Contrast table (2)
20 Back Cover See Contrast table (2)
21 Diffuser Lens 500PMT309000
22 Top Panel 500PMT311001
23 Meter Holder 505PMT307000
24 Lens Holder 505PMT308000
25 Rectifier PCB Bracket 505PMT370000
26 PCB Bracket-R 505PMT372000
27 Mounting Bracket 505266422000
28 Power Knob 510PMT312001
29 Voltage Selector Knob 510PMT319000
30 Side Panel-L 600PMT117002
31 Side Panel-R 600PMT118002
NSP 32 Bottom Tray 600PMT302000
33 Copper Post 603PMT381000
34 Power Switch Bracket 605PMT313000
35 Transformer Bracket 605PMT317000
36 Mounting Bracket-1 605PMT373000
37 Mounting Bracket-2 605PMT374000
38 Mounting Bracket-3 605PMT375000
39 Mounting Bracket-4 605PMT376000
40 • • • • •
41 Heat Sink CDG-74 6130CDG74000
42 PCB Sheet 650PMT377000
43 Bushing 700PMT156000
44 Rubber Foot 700PMT384000
45 Strain Relief Bushing 700036022000
46 EMC Label See Contrast table (2)
47 Back Label See Contrast table (2)
NSP 48 Serial Label 809000009000
49 Screw BBZ30P100FNI
50 Screw BBZ30P180FMC
51 Screw BBZ40P060FMC
52 Screw BPZ30P100FNI
53 Screw KBZ30P060FNI
54 Foot Stand 509PMT329000
55 Holding PCB PMT1LA-100-121
56 Caution Label See Contrast table (2)
57 AC Cord Label See Contrast table (2)
(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 /DDXCN/AR
19 AC Cord 134250220000 134220120016
20 Back Cover 500PMT303000 500PMT388000
46 EMC Label 809PMT394030 Not used
47 Back Label 809PMT396040 809PMT396060
56 Caution Label Not used 809PMT394070
57 AC Cord Label Not used 809PMT394100
5
1
M-LA21
3. SCHEMATIC DIAGRAM
A
3.1 OVERALL WIRING DIAGRAM
B
23
E
POWER METER ASSY
(PMT1LA100081)
(PH)
3
4
(PH)
4
C
From
XC-LA21
SPEAKER
OUT
L
D
5 7
IC504
BA4558N
(PH)
4
JACK ASSY
D
(PMT1LA100021)
4 4
A
7
7
18 14
IC601
STK411-230
POWER AMPLIFIER
RL601
PLY-DPDT
AMP ASSY
(PMT1LA100011)
R
4 4
6
1234
5
678
M-LA21
Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST".
A
F
LED ASSY
(PMT1LA100051)
3
(PH)
(PH)
G
HP JACK ASSY
(PMT1LA100111)
: AUDIO SIGNAL ROUTE
: AUDIO SIGNAL ROUTE (PHONES)
(PH)
PHONES
B
C
D311
From
XC-LA21
B
TRANSFORMER
ASSY
(PMT1LA100031)
C
AC IN
PRIMAY ASSY
(PMT1LA100041)
5
6
7
8
D
7
1
23
M-LA21
3.2 AMP, TRANSFORMER and PRIMARY ASSYS
4
A
B
AMP ASSY (PMT1LA100011)
A
010-550411-000A
MTZJ6.2A
MTZJ6.2A
003-030840-050
003-030840-050
2/2
BA4558DX
BA4558DX
1/2
018-030036-300A
004-022410-100
C
D
018-030036-300A
004-022410-100
CN602
136-08PMT3-200J
011-020602-001A
006-033200-63D
011-025401-000A
006-033200-80D
NJM78M12FA
NJM79M12FA
CN22
D
8
A
1234
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