Pioneer M-LA21 User manual

ORDER NO.
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
c
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
M-LA21
RRV2393
T – IZK OCT. 2000 Printed in Japan
STEREO POWER AMPLIFIER
1. SAFETY INFORMATION ....................................... 2
2. EXPLODED VIEWS AND PARTS LIST ................. 3
3. SCHEMATIC DIAGRAM .......................................... 6
4. PCB CONNECTION DIAGRAM ........................... 12
5. PCB PARTS LIST ................................................ 18
6. ADJUSTMENT..................................................... 19
CONTENTS 7. GENERAL INFORMATION ................................ 20
7.1 DIAGNOSIS .................................................. 20
7.1.1 SINGLE OPERATION METHOD ......... 20
7.1.2 DISASSEMBLY .................................... 21
8. PANEL FACILITIES AND SPECIFICATIONS .... 23
LA21
STEREO POWER AMPLIFIER
DINAMIC
—OFF _ON
DYNAMICMODE
HIGH EFFICIENT
AMPLIFIER
POWER OUTPUT
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
¶System component Table
¶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.
Type Model Power Requirement The voltage can be converted by
M-LA21 the following method.
DBDXCN AC110-127V / 220-230V / 240V With the Voltage Selector
DDXCN/AR AC110-127V / 220-230V / 240V With the Voltage Selector

2
M-LA21
1. SAFETY INFORMATION
This service manual is intended for qualified service technicians ; it is not meant for the casual do-it-
yourselfer. 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.
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 on the schematics and on the parts list
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.
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.
(FOR USA MODEL ONLY)
Leakage
current
tester
Reading should
not be above
0.5mA
Device
under
test
Test all
exposed metal
surfaces
Also test with
plug reversed
(Using AC adapter
plug as required)
Earth
ground
AC Leakage Test

3
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.
•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.
2.1 PACKING (X-LA21)
SYSTEM
SPEAKER
REAR
XC-LA21
REAR
M-LA21
FRONTFRONT
FRONTFRONT
TOP SIDETOP SIDE
13
3
1
5
14
7
411
17
15
16
19
20DDXCN/AR Only
9(2/2)
10
10
9(1/2)
8(2/2)
12
8(1/2)18
18
11
8(2/2)
12
12
8(1/2)
6
2
(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
11 Polythenefoam Sheet 801999000005
NSP 12 PE Polybag (AC Cord) 805032115000
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

4
M-LA21
22 15
18
2
51
16 329
49
42
49
53
52 52
47 48
52
52
53
20
53
50
53
53
53 52
53
31
53
53
53
34
28
7
56
52
53
10
54
54
53
53
50
12
19
45
13
43
1
32
33(×3)
49
40
9
4
53
53
53
53 53
53
53
53
52
52
30
53
35
17
14
25
36
26
38
37
36
39
55
56
DDXCN/AR
Only
DDXCN/AR
Only
57
44
46
44
52
27
BC
C
E
G
B
D
D
A
F
F
H
G
A
E
H
11
23
24
21
D
B
C
A
F
E
G
DBDXCN
Only
2.2 EXTERIOR SECTION

5
M-LA21
1 AMP Assy PMT1LA100011
2 TRANSFORMER Assy PMT1LA100031
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
(1) EXTERIOR SECTION PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.
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

M-LA21
6
A
B
C
D
1234
1234
POWER METER ASSY
(PMT1LA100081)
E
JACK ASSY
(PMT1LA100021)
D
AMP ASSY
(PMT1LA100011)
A
IC601
STK411-230
POWER AMPLIFIER
RL601
PLY-DPDT
L
R
SPEAKER
OUT
18 14
IC504
BA4558N
From
XC-LA21
3
(PH)
(PH)
(PH)
4
4
4 4
4 4
7
7
5 7
3. SCHEMATIC DIAGRAM
3.1 OVERALL WIRING DIAGRAM

M-LA21
7
A
B
C
D
5678
5678
TRANSFORMER
ASSY
(PMT1LA100031)
B
PRIMAY ASSY
(PMT1LA100041)
C
AC IN
PHONES
HP JACK ASSY
(PMT1LA100111)
G
LED ASSY
(PMT1LA100051)
F
: AUDIO SIGNAL ROUTE
(PH)
(PH)
From
XC-LA21
3
: AUDIO SIGNAL ROUTE (PHONES)
(PH)
D311
Note :When ordering service parts, be sure to refer to "EXPLODEDVIEWS and PARTS LIST" or "PCB PARTS LIST".

M-LA21
8
A
B
C
D
1234
1234
AMP ASSY (PMT1LA100011)
010-550411-000A
A
CN602
136-08PMT3-200J
CN22
D
MTZJ6.2A
MTZJ6.2A
018-030036-300A
018-030036-300A
2/2
1/2
BA4558DX
BA4558DX
011-020602-001A
011-025401-000A
NJM78M12FA
NJM79M12FA
006-033200-80D
006-033200-63D
004-022410-100
004-022410-100
003-030840-050
003-030840-050
3.2 AMP, TRANSFORMER and PRIMARY ASSYS
A

M-LA21
9
A
B
C
D
5678
5678
PRIMARY ASSY (PMT1LA100041)
C
TRANSFORMER ASSY
(PMT1LA100031)
B
WH601
136-05PMT3-350J
WH1
025-230041-000A
CN604
136-07PMT3-202J
WH602 136-04PMT3-350J
CN1
135-PHS060-060J
CN8
CN603
136-06PMT3-200J
CN4
D
CN23
D
AC IN
2/2
1/2
BA4558DX
BA4558DX
011-025401-000A
011-020005-000A
011-020005-000A
011-020005-000A
011-020005-000A
011-020602-001A
011-024001-000A
BZ605
MTZJ3.0A
BZ604
MTZJ3.0A
010-024001-000A
128-1221125-000
Q617 DTA114YS 008-801144-000A
Q610 DTA114YS
008-801144-000A
D311
011-024001-000A
006-033200-63D
006-033200-80D
: AUDIO SIGNAL ROUTE (L ch)
: AUDIO SIGNAL ROUTE (PHONES)
HP
HP
HP
HP
• NOTE FOR FUSE REPLACEMENT
FOR CONTINUED PROTECTION AGAINST RISK OF FIRE.
REPLACE WITH SAME TYPE AND RATINGS ONLY.
CAUTION -
124063020001
124010020001
124031520003
124025020001
124025020001
1236C0250140
025-230041-000A
122006020060
AC CORD
124250220000
137-400001-000J
NEUTRAL
LIVE
135-PHS020-020J
128-090109-000A
CBA

M-LA21
10
A
B
C
D
1234
1234
CN23
JK501
118-000134-003J
JK502
118-020202-0001J
JACK ASSY (PMT1LA100021)
D
WH602
A
AUDIO IN
LR
IC504
BA4558DX
IC502
BA4558DX
1/2
MTZJ9.1C
MTZJ12B
135-053259-040J
004-033210-100
004-056210-100
004-056210-100
3.3 JACK, POWER METER, LED and HP JACK ASSYS
D

M-LA21
11
A
B
C
D
5678
5678
CN11
136-11PMT3-200J
CN2 135-PHS110-110J
CN22 135-PHS080-080J
CN3 135-PHS070-070J
CN4
135-PHS070-070J
CN13
050-060060-200J
CN16
135-030060-200J
CN17
CN12
136-17PMT3-200J
CN20
135-053259-040J
JK503
116-008020-000
110-033162-003A
110-033040-013A
PHONES
POWER METER ASSY
(PMT1LA100081)
E
HP JACK ASSY
(PMT1LA100111)
G
LED ASSY
(PMT1LA100051)
F
CN602
A
CN604
A
IC502
BA4558DX
2/2
: AUDIO SIGNAL ROUTE (L ch)
: AUDIO SIGNAL ROUTE (PHONES)
HP
HPHPHPHP
HP
HP
HP
HP JACK ASSY
SW501 : DYNAMIC
021-022322-000A
GFED

M-LA21
12
A
B
C
D
1234
1234
E
E
E
Z2
Z1
WH601
Q617
P3
R670
D607 D609 D608 D610
CN603
EC633
IC605
W603
W607
W606
P2
W601
W602
W605
W604
EC622
EC623
R305
EC621
IC604
EC625
EC626
EC620
EC624
D612 D611
C618
C619
ORN BLU BLK WHT RED
WHT
YEL
ORN
RED
BRN
BLK
PWRCTL
CTLGND
MUTE
16VAC2
GND
16VAC1
ACVH2 ACVL2 ACGND ACVL1 ACVH1
NOTE FOR PCB DIAGRAMS :
• Part numbers in PCB diagrams match those in the schematic
diagrams.
• The parts mounted on this PCB include all necessary parts for
several destinations.
For further information for respective destinations, be sure to
check with the schematic diagram.
• View point of PCB diagrams.
Capacitor
Connector
P.C.Board Chip Part
SIDE A
SIDE B
Q617
AMP ASSY
A
WH1
B
CN1
B
SIDE A
A
4. PCB CONNECTION DIAGRAM
4.1 AMP ASSY

M-LA21
13
A
B
C
D
5678
5678
E
E
E
E
E
E
E
E
E E E E
E
E
E E
CN604
EC608
C637
C636
DZ605 DZ604
Z1
BLK
BLK.
R681
D616
WH602
P3
W612
W640
D615
D614
Q616
R672 R671
R669
W639
W638
W637
Q615
W630
C602
C630
C631
C601
C606
CN602
D613
R622
W613
EC630 EC631
W633
W628
R659
W614
W625
EC617
R667
D606
R646
R649
R647
R648
W618
W616
W611
W626
Q606
EC616
EC619
Q604
R654
R652
EC615
Q605 R639
W602
W619
W617
P1
W610
W627
W634
W629
W635
R661
R625
E
C622
W624
R618
R620
EC614
D601
DZ603
Q603
Q602
Q601
R623
R626
R644
R635
R663 R628
R624
R627
R631
R630
R633
R637
R645
R632
R634
R636
R638 R642 R643
R640
R641
EC610
EC611
EC607
EC609
C607
C610
C609
C608
EC612
EC613
C611
C612
IC603
IC602
W609
L601
L602
W620
W621
W622
W623
R602
R601
DZ602
DZ601
R609
R608
EC626
EC620
EC624
IC601
R657
C634
C633
R653
R651
R662
R656 Q613
Q611 Q614
Q612
Q610
R629
R604
R664
R650
EC601
R603
EC602
R605
C603
C604 R615
D602
R610
R607
R612
R617
R606
EC606
R611
EC605
R613
C635
R658
R668 R621
EC618
R665
Q607
RL601
R616
Q608
EC603
R619
EC604
R614
Q609
D604
PMT1LA-01-01 AMP BOARD
"BOND"
WHT
WHT
RED
BLK
BLK
ORN
WHT
WHT
WHT
WHT
RED
PWRCTL
AGND
L+R SIG
SPKR
GND
GND
SPKL
-12V
+12V
GND
HPRCH
HPGND
HPLCH
SPKCTL
AGND
RIN
AGND
LIN
CTL GND
Q617
IC603 IC602Q603
Q602 Q601 IC601Q609Q616Q610
Q607 Q615 Q604
Q606 Q605
Q611 Q613 Q614 Q612
Q608
CN23
D
CN4
D
CN22
D
A

M-LA21
14
A
B
C
D
1234
1234
CN9
CN8
PWRCTL
GND.
PWR
J2
F329
J1
F328
NL
SW301
C321
RL301
R308
C316
C315
L301
F321
D311
"BOND"
BRN
BLU
YEL
ORN
RED
BLK
F321
F328F329
LN
PRIMARY BOARD
PMT1LA-01-04
PRIMARY
DANGER
MUTE CTLGND
PRIMARY ASSY
C
AC IN
NEUTRAL LIVE
SIDE A
C
4.2 TRANSFORMER and PRIMARY ASSYS

M-LA21
15
A
B
C
D
5678
5678
CN10
WH1
CN1
PT1
BRN
BLU
YEL
ORN
RED
BLK
F326
F327
F325
F324
F323
F322
ORN
BLU
BLK
WHT
RED
BLK
PWRCTL
GND
TRANSFORMER BOARD
PRIMARY DANGER
GND
16VAC1
16VAC2
MUTE
ACVH2
ACVL2
ACGND
ACVL1
ACVH1
PMT1LA-01-03
TRANSFORMER ASSY
B
CN603
A
WH601
A
SIDE A
B

M-LA21
16
A
B
C
D
1234
1234
MSSOP36-P-450-0.A
R577
R589
CN4
J564
J563
D511
C558
R581
R591
R520
EC541
R576
Q512
EC562
EC561
CN22
CN23
CN3
CN2
W1
J54
J83
J82
R575
Q513
J81
R555
J80
J78
J74
EC560
EC559
J71
EC546
Z2
Z1
J68
J67
C557
C556
R506
Q518
C549
R505
R504
R503
Q517
C548
R502
R501
R507
Q516
C547
R599 R598
Q515
R597
R596
R594
R593
DZ506
EC549
R592
Q514
R570
R569
J61
J59
C546
EC548
EC537
R561
EC531 R560
J52
J40
J39
J29
C545
C544
R588
R587
R586 R585
R584
JK502
JK501
C531
R580
R579
R572
R571
EC534
EC533
R567
C543
C541
C539
R590
R558
IC504
R557
C535
R529
EC530
C533
R530
C532
R554
R553
R552
R550
R551
R549
C530
C529 C528
R548 R547 C524 R542
R534
R533
R532
R545
C523
C520
C519
C518
C517
C516
R521
R523
R522
C525
R518
IC512
Q501
Q511
Q503
Q502
Q504
D510
D506
DZ504
D509
DZ505
EC520
EC518
EC515
EC517
EC513 EC512
EC511
EC521
EC528
EC527
EC526
EC525
EC524
EC523
EC522
EC545
EC535
EC544
EC532
EC529
EC536
EC514
IC502
"BOND"
"BOND"
"BOND"
"BOND"
PWRCTL
AGND
JACK BOARD
FOR NON-KARAOKE
TO EC522
TO EC523
RCHOUT
AGND
AGND
-12V
AGND
+12V
HPSW
HPRCH
HPGND
HPLCH
+12V
-12V
+12V
ECHOSIG1
ECHOSIG2
LIN
RIN
GND
MICIN
MICSW
VOLGND
PMT1LA-01-02
MICGND
MICSIG1
MICSIG2
-6dB SW
METER
METERIN
GND
HPRCH
HPGND
HPLCH
HPSW
LCHOUT
GND
GND
SPKR
SPKL
Q511
Q515
Q518
Q517 Q513 Q512 Q501 Q502 Q503Q504 IC502
IC504 IC512Q516 Q514
JACK ASSY
D
CN12
E
WH602
A
CN604
A
CN11
ECN602 A
SIDE A
D
4.3 JACK ASSY

M-LA21
17
A
B
C
D
1234
1234
MMETER
W6
CN12
CN13
CN11
CN15
CN14
W2
W1
W5
W3
W4
CN16
R574
R573
CN17
LED501
LED503
LED502
EC556
EC557
C551
R565
EC555
R564 R568
EC558
W554
W552 CN20
JK504
CN19
IC506
JK503
SW501
PMT1LA-01-11
PMT1LA-01-05
PMT1LA-01-08
ECHOS1
+12V
ECHOS2 VOLGND
MICS2 -12V MICS1
MIC SW
-12V
MIC
+12V
MIC GND
+12V
DYNAMIC
HP Lch HP GND HP Rch HP SW
HPSW
DYNAMIC
+12V
HP SW
+12V
DYNAMIC
MICS1
-12V
ECHOS2
+12V
+12V
DYNAMIC
+12v
GND
MIC
ECHOS1
MICS2
MIC SW
MIC GND
MIC
LED GND
METER
VOLGND
HP Rch
HP GND
HP Lch
PMT1LA-01-11
PMT1LA-01-05
PMT1LA-01-08
MIC SW
MIC GND
MIC
HPRCH HPLCH HPGND
DYNA +12v GND
-12V
HP JACK ASSY
G
LED ASSY
F
POWER
METER
ASSY
E
CN3
D
CN2
D
SIDE A
GFE
4.4 POWER METER, LED and HP JACK ASSYS

18
M-LA21
Mark No. Description Part No. Mark No. Description Part No.
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.
•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.
•When ordering resistors, first convert resistance values into code form as shown in the following examples.
Ex.1 When there are 2 effective digits (any digit apart from 0), such as 560 ohm and 47k ohm (tolerance is shown by J=5%,
and K=10%).
560 Ω→56 × 101→561 ........................................................ RD1/4PU 56
1
J
47k Ω→47 × 103→473 ........................................................ RD1/4PU
4 7
3J
0.5 Ω→R50 ..................................................................................... RN2H R5
0
K
1 Ω→1R0 ..................................................................................... RS1P
1
R0K
Ex.2 When there are 3 effective digits (such as in high precision metal film resistors).
5.62k Ω→ 562 × 101→5621 ...................................................... RN1/4PC 56
2
1F
LIST OF ASSEMBLIES
AMP ASSY PMT1LA100011
TRANSFORMER ASSY PMT1LA100031
PRIMARY ASSY PMT1LA100041
JACK SSY PMT1LA100021
POWER METER AASSY PMT1LA100081
LED ASSY PMT1LA100051
HP JACK ASSY PMT1LA100111
AMP ASSY
SEMICONDUCTORS
IC601 (STK411-230) 010-550411-000A
IC602,IC603 BA4558DX
IC604 NJM78M12FA
IC605 NJM79M12FA
Q601,Q602 2SK246
Q603 DTA124ES
Q605-Q608,Q616 2SC1815
Q611-Q614 2SD1468S
Q604,Q609,Q615 2SA1015
Q610,Q617 (DTA114YS) 008-801144-000A
D602,D616 1N4148
D604,D606 (RECTIFIER IN-4001B) 011-024001-000A
D607-D610 (RECTIFIER J-05) 011-020005-000A
D611,D612 (BRIDGE RECTIFIER) 011-020602-001A
D614,D615 (RECTIFIER IN-5401BL) 011-025401-000A
BZ604,BZ605 MTZJ3.0A
DZ601,DZ602 MTZJ6.2A
COILSL601,L602 (3µH) 018-030036-300A
RELAY
RL601 (12V OSA-SS-212DM5) 128-122125-000A
CAPACITORS
C603,C604,C633,C634 004-022410-100
(MYLAR CAP 0.22 uF/100V)
C606,C635 CKCYB471K50
C607,C610 CKCYB682K50
C608,C609,C611,C612 CCCCH100D50
C618,C619 CKCYB103K50
C630,C631 CKCYB102K50
C636,C637 CKCYB101K50
C601,C602 CCCCH030D50
EC607-EC609,EC618 CEAT1R0M50
EC615,EC630,EC631 CEAT2R2M2A
EC603,EC604 CEAT2R2M50
EC619 CEAT100M50
EC601,EC602 CEAT101M2A
EC621,EC633 CEAT101M25
EC616 CEAT221M16
EC617 CEAT331M10
EC620,EC624 (ELECT3300µF/63V) 006-033200-63D
EC625,EC626 (ELECT3300µF/80V) 006-033200-80D
EC605,EC606,EC610-EC614 CEAT470M16
EC622,EC623 CEAT471M25
RESISTORS
R603,R605 RS2LMF101J
R608,R609,R615,R616 RS1LMF4R7J
R652,R654 RS3LMFR22J
R664,R665 RS1LMF681J
Other Resistors RD1/4PU J
OTHERS
CN602 HSG PMT3-8A JST PHR- 136-08PMT3-200J
CN604 HSG PMT3-7C JST PHR- 136-07PMT3-202J
WH602 HSG MOLEX 51067-0400 136-04PMT3-350J
WH601 HSG MOLEX 51067-0500 136-05PMT3-350J
CN603 HSG PMT3-6A JST PHR- 136-06PMT3-200J
JP WIRE AWG22 80MM B 051-275080-009J
JP WIRE AWG26 80MM B 051-675080-009J
ROUND PIN 137-500001-000J
TRANSFORMER ASSY
OTHERS
CN1 HEADER CTL 6 PINS 135-PHS060-060J
WH1 HEADER MOLEX 5 PINS 135-053258-050J
FUSE HOLDER 7900,HT 550-790000-000J
A
B

19
M-LA21
Mark No. Description Part No. Mark No. Description Part No.
PRIMARY ASSY
SEMICONDUCTOR
D311 (RECTIFIER IN-4001B) 011-024001-000A
RELAY • SWITCH
RL301 (RELAY 9 OSA-SS-212DM) 128-090109-000A
SW301 (SLIDE SW VOLT.SELECTOR) 025-230041-000A
CAPACITORS
C315,C321 (CERAMIC CAP 0.01µF) 003-010320-250A
OTHERS
CN8 HEADER CTL 2 PINS 135-PHS020-020J
JP WIRE AWG22 BROWN 054-010150-010J
JP WIRE AWG22 ORANGE 054-010150-030J
JP WIRE AWG22 BLUE 054-010150-050J
JP WIRE AWG22 RED 054-010150-061J
JP WIRE AWG22 BLACK 054-010150-093J
JP WIRE AWG22 YELLOW 054-010150-100J
AC CONTACT TERMINAL 137-400001-000J
FUSE HOLDER 7900,HT 550-790000-000J
JACK ASSY
SEMICONDUCTORS
IC502,IC504 BA4558DX
Q502,Q515 DTA124ES
Q501,Q503,Q513 DTC124ES
Q504 2SA1015
Q511 DTC114ES
Q512 2SC1815
Q516-Q518 2SK246
D506,D509,D510,D511 1N4148
DZ504 MTZJ9.0C
DZ505 MTZJ12B
CAPACITORS
C541,C543 CKCYB101K50
C539,C546 CKCYF103Z50
C547,C548 (MYLAR CAP 5600pF) 004-056210-100
C549 (MYLAR CAP 3300pF) 004-033210-100
C556,C557 CKCYB102K50
C533,C558 CGCYF104Z25
EC544,EC545 CEJQ2R2M50
EC532,EC548 CEJQ101M16
EC535,EC536 CEJQ220M16
EC561,EC562 CEJQ470M16
EC531,EC533,EC534,EC537 CEJQ100M16
EC546,EC559,EC560 CEJQ100M16
EC529,EC530,EC541 CEJQ1R0M50
RESISTORS
All Resistors RD1/4PU J
OTHERS
CN3,CN4 HEADER CTL 7 PINS 135-PHS070-070J
CN22 HEADER CTL 8 PINS 135-PHS080-080J
CN2 HEADER CTL 11 PINS 135-PHS110-110J
JK501 PUSH TERMINAL BOARD 118-000134-003J
JK502 PIN JACK BOARD 118-020202-001J
JP WIRE AWG26 50MM R 051-675050-006J
JP WIRE AWG26 50MM B 051-675050-009J
CN23 HEDER MOLEX 4PINS 53 135-053259-040J
POWER METER ASSY
OTHERS
CN11 HSG PMT3-11A JST 136-11PMT3-200J
CN12 HSG PMT3-7A JST 136-07PMT3-200J
CN13 CONN PIN 6 PINS 050-060060-200J
CN16 CONN PIN 3 PINS 050-030060-200J
LED ASSY
SEMICONDUCTORS
LED502,LED503 (LED-R-3MM&-S-STP)110-033040-013A
LED501 (LED-BL-3MM&-S-&&&) 110-033162-003A
RESISTORS
All Resistors RD1/4PU J
HP JACK ASSY
SWITCH
SW501 (PUSH BOTTON SWICH 2P2T) 021-022322-000A
OTHERS
JK503 HEADPHONE JACK ST 116-008020-000
D
C
6. ADJUSTMENT
There is no information to be shown in this chapter.
E
F
G

20
M-LA21
7. GENERAL INFORMATION
7.1.1 SINGLE OPERATION METHOD
7.1 DIAGNOSIS
CN9
CN8
PWRCTL
GND.
PWR
J2
F329
J1
F328
NL
SW301
C321
RL301
R308
C316
C315
L301
F321
D311
"BOND"
BRN
BLU
YEL
ORN
RED
BLK
F321
F328F329
LN
PRIMARY BOARD
PMT1LA-01-04
PRIMARY
DANGER
MUTE CTLGND
PRIMARY ASSY
C
DC power supply
DC+9V
GND
Please supply +9V from DC power supply to the following point.