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ORDER NO.
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
RRV1935
STEREO AMPLIFIER
A-207
1. SAFETY INFORMATION ...................................... 2
2. EXPLODED VIEWS AND PARTS LIST ................ 3
3. SCHEMATIC DIAGRAM ....................................... 6
4. PCB CONNECTION DIAGRAM .......................... 14
5. PCB PARTS LIST ............................................... 22
6. ADJUSTMENT .................................................... 25
CONTENTS
7. GENERAL INFORMATION ................................ 26
7.1 IC ................................................................. 26
7.2 DISASSEMBLY ........................................... 27
7.3 BLOCK DIAGRAM ....................................... 28
8. PANEL FACILITIES AND SPECIFICATIONS .... 29
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Type
Model
A-207
MLXJ
SDXJ
AC220 ­ 230V
Power Requirement
The voltage can be converted by the
following method.
­­­­­­­
With the voltage selector
T ­ ZZE APR. 1998 Printed in Japan
AC110V/120 ­127V/220V/240V
PHONES
A SPEAKERS B
POWER
OFF
ON
STEREO AMPLIFIER
-
­
z¿<? Direct Energy MOS
TAPE 1
/MD
TAPE 2
MONITOR
LINE
TUNER
PHONO
CD
BASS
+
­
TREBLE
+
­
VOLUME
MIN
MAX
LOUDNESS
DIRECT
BALANCE
R
L
INPUT SELECTOR
TAPE 2
MONITOR


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A-207
2
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
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.
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


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3
A-207
2.1 PACKING
Mark No.
Description
Part No.
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.
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
NSP
6
Literature Bag
AHG1180
7
Packing Sheet
AHG7015
8
Caution Label 220V
See Contrast table(2)
9
Power Cord
See Contrast table(2)
(1) PACKING PARTS LIST
(2) CONTRAST TABLE
A-207/MLXJ and SDXJ are constructed the same except for the following :
6
7
2
4
5
3
9
1
8
(SDXJ type
Only)
FRONT
Mark
MLXJ type
SDXJ type
8
Caution Label 220V
Not used
ARR1003
9
Power Cord
ADG1154
ADG1158
Part No.
Remarks
Symbol and Description
No.


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4
A-207
2.2 EXTERIOR
41
18
28
37
39
34
35
5
41
16
1
2
9
45
31
33
31
32
38
27
27
44
14
39
21
21
39
14
47
17
12
22
19
19
23
23
23
13
39
SDXJ
Types Only
42
39
40
39
39
7
15
39
4
43
8
15
15
15
6
39
11
17
39
39
26
26
39
39
39
39
36
SDXJ Types
Only


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5
A-207
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.
Mark No.
Description
Part No.
(1) EXTERIOR PARTS LIST
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
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 : AC220­230V)
11
Power Transformer
Not used
ATS7191
(T1 : AC110V/120­127V/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
Symbol and Description
No.