Pioneer A-207 Service manual

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TAPE 2
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A SPEAKERS B

STEREO AMPLIFIER

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Direct Energy MOS

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STEREO AMPLIFIER

A-207

THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).

Type

MLXJ
SDXJ

Model

A-207

Power Requirement

AC220 – 230V
AC110V/120 –127V/220V/240V

The voltage can be converted by the
following method.

–––––––

With the voltage selector

ORDER NO.

RRV1935

CONTENTS

1. SAFETY INFORMATION

2. EXPLODED VIEWS AND PARTS LIST

3. SCHEMATIC DIAGRAM

4. PCB CONNECTION DIAGRAM

5. PCB PARTS LIST

6. ADJUSTMENT

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................

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14
22
25

2
3
6

7. GENERAL INFORMATION

7.1 IC

7.2 DISASSEMBLY

.................................................................

...........................................

7.3 BLOCK DIAGRAM

8. PANEL FACILITIES AND SPECIFICATIONS

PIONEER ELECTRONIC 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 ELECTRONIC (EUROPE) N.V. Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 501 Orchard Road, #10-00 Lane Crawford Place, Singapore 0923

PIONEER ELECTRONIC CORPORATION 1998

T – ZZE APR. 1998 Printed in Japan

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26
26
27
28
29

A-207

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
Lead in solder used in this product is listed by the California Health and Welfare agency as a known reproductive toxicant which may
cause birth defects or other reproductive harm (California Health & Safety Code, Section 25249.5).
When servicing or handling circuit boards and other components which contain lead in solder, avoid unprotected skin contact with
the solder. Also, when soldering do not inhale any smoke or fumes produced.

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)

Test all
exposed metal
surfaces

Leakage
current
tester

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

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.

•

(1) PACKING PARTS LIST

9

Mark No. Description Part No.

A-207

8
(SDXJ type

6

7

2

4

5

FRONT

Only)

1

NSP 6 Literature Bag AHG1180

9 Power Cord See Contrast table(2)

3

1 Operating Instructions ARE7158

(English/Spanish/Chinese)
2 Side Pad L AHA7205
3 Side Pad R AHA7206
4 Sub Pad AHA7218

5 Packing Case AHD7562
7 Packing Sheet AHG7015

8 Caution Label 220V See Contrast table(2)

(2) CONTRAST TABLE

A-207/MLXJ and SDXJ are constructed the same except for the following :

Mark

No.

8 Caution Label 220V Not used ARR1003
9 Power Cord ADG1154 ADG1158

Symbol and Description

MLXJ type SDXJ type

Part No.

Remarks

3

A-207

2.2 EXTERIOR

36

39

26

39

45

28

38

39

18

37

41

16

34

35

27

26

39

39

SDXJ Types
Only

1

5

2

9

11

41

39

6

17

43

39

15

8

4

15

15

7

13

39

42

39

15

SDXJ
Types Only

39

39

39

31

33

31

32

27

39

44

12

14

39

17

22

19

21

19

21

40

23

23

23

47

14

39

4

(1) EXTERIOR PARTS LIST

A-207

Mark No. Description Part No.

1 FRONT L Assy AWX7122
2 FRONT R Assy AWX7121
3 • • • • •
4 AC PRIMARY Assy See Contrast table(2)

NSP 5 HEADPHONE Assy AWX7114

6 VOLUME Assy AWX7112
7 AF Assy AWX7116

8 Fuse (FU1) See Contrast table(2)

9 Flexible Cable (19P) ADD7032

(AF CN202-FRONT R CN601)

10 • • • • •

11 Power Transformer (T1) See Contrast table(2)
NSP 12 Chassis ANA7064

13 Rear Panel See Contrast table(2)
14 Insulator AMR7198
15 Screw ABA1018

16 Screw ABA1027
17 Screw (4 × 10) ABA7047
18 Nut ABN-065
19 PCB Support AEC7006
20 • • • • •

NSP 21 PCB Holder AEC7057
NSP 22 Cord Clamp F AEC7134

23 PCB Mold AMR2533
24 • • • • •
25 • • • • •

Mark No. Description Part No.

26 Screw PBA1096
27 LED Lens AAK2459
28 PVC Cover AAK7541
29 • • • • •
30 • • • • •

31 Rotary Knob A AAB7148
32 Rotary Knob B AAB7149
33 Volume Knob AAB7150
34 Speaker Button AAD7435
35 Power Joint AAD7439

36 Bnnet Case ANE7183
37 Panel Base AMB7489
38 Front Panel AMB7492
39 Screw BBZ30P080FZK
40 Screw BCZ30P060FCC

41 Nut NK90FUC
42 Voltage Selector (S2) See Contrast table(2)
43 Fuse (FU2, FU3 : 2A) See Contrast table(2)

44 LED Lens A AAK7537

45 PIONEER Badge PAM1755

46 • • • • •

47 Foot REC1263

(2) CONTRAST TABLE

A-207/MLXJ and SDXJ are constructed the same except for the following :

Mark

No.

Symbol and Description

MLXJ type SDXJ type

4 AC PRIMARY ASSY AWX7113 AWX7115
8 Fuse (FU1 : 1.25A) REK1023 Not used
8 Fuse (FU1 : 6.3A) Not used REK1030

11 Power Transformer ATS7190 Not used

(T1 : AC220–230V)

11 Power Transformer Not used ATS7191

(T1 : AC110V/120–127V/220V/240V)
13 Rear Panel ANC7642 ANC7641
42 Voltage Selector Not used AKX-507

43 Fuse (FU2, FU3 : 1.25A) Not used REK1023

Part No.

Remarks

5

1

23

A-207

3. SCHEMATIC DIAGRAM

3.1 OVERALL CONNECTION DIAGRAM

A

B

HEAD PHONE ASSY
AWX7114

B

4

F

FRONT R ASSY
AWX7121

D

AF ASSY
AWX7116

C

451

A

VOLUME ASSY
AWX7112

D

6

1234

5

678

A-207

Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and P AR TS LIST" or "PCB PARTS LIST".

E

FRONT L ASSY
AWX7122

1602

POWER CORD

MLXJ type

A

B

POWER TRANSFORMER

POWER TRANSFORMER

14

16

18

SDXJ type

C

AC PRIMARY ASSY
AWX7113(MLXJ)
AWX7115(SDXJ)

AKP1053 SDXJ only

VOLTAGE SELECTOR

MLXJ type

SDXJ type

SDXJ type

SDXJ type

C

D

7

5

6

7

8

1

23

A-207

3.2 VOLUME AND HEAD PHONE ASSEMBLIES

A

B

HEAD PHONE ASSY
AWX7114

B

D

4

J551A

: AUDIO SIGNAL ROUTE

VOLUME ASSY

A

AWX7112

C

J3

E

2

2

D

CN203

D

8

A

B

1234

1

3.3 AC PRIMARY ASSY

• NOTE FOR FUSE REPLACEMENT

CAUTION -

AC PRIMARY ASSY

C

AWX7113(MLXJ)
AWX7115(SDXJ)

FOR CONTINUED PROTECTION AGAINST RISK OF FIRE.
REPLACE WITH SAME TYPE AND RATINGS ONLY.

234

A-207

A

TO POWER

TRANSFORMER

NEUTRAL

LIVE

SDXJ model

SDXJ type

REK1023

T1.25AL250V

MLXJ type

POWER

ASG1035

FU1
REK1023 : MLXJ type
T1.25AL250V
REK1030 : SDXJ type
T6.3AL250V

SDXJ type

REK1023

T1.25AL250V

TO S2
VOLTAGE SELECTOR

B

TO POWER CORD

C

D

C

1

2

3

4

9

A-207

3.4 AF ASSY

A

1

23

4

BA

B

BA

C

1/4WR

1/4WR

1/4WR

BA

BA

1/4WR

IDLE ADJ.
(L CH)

BA

BA

IDLE ADJ.
(R CH)

D

CN501

A

D

10

1234