Pioneer MIS-21 Service manual

ORDER NO.

RRV2129

STEREO POWER AMPLIFIER

M-IS21

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

Type

MYXJ AC220-230V
NVXJ AC230V

This product is a component of a system.
For the accessories, instruction manuals etc., refer to the service manuals RRV2124 for
XC-IS21MD and RRV2123 for XC-IS21T.
This product does not function properly when independent; to avoid malfunctions, be
sure to connect it to the prescribed system component(s), otherwise damage may
result.

Model

M-IS21

Power Requirement Remarks

Component

CD MD TUNER XC-IS21MD ––– RRV2124
CD TUNER DECK ––– XC-IS21T RRV2123
STEREO POWER AMPLIFIER M-IS21 M-IS21 RRV2129 This Service Manual
SPEAKER SYSTEM S-IS21 S-IS21 RRV2128

IS-21MD IS-21T

System

Service Manual Remarks

CONTENTS

1. SAFETY INFORMATION

2. EXPLODED VIEWS AND PARTS LIST

3. SCHEMATIC DIAGRAM

4. PCB CONNECTION DIAGRAM

5. PCB PARTS LIST

6. ADJUSTMENT

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. 253 Alexandra Road, #04-01, Singapore 159936

PIONEER ELECTRONIC CORPORATION 1999

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14
16

2
3
6
8

7. GENERAL INFORMATION

7.1 SINGLE OPERATION METHOD

8. PANEL FACILITIES AND SPECIFICATIONS

T – ZZK APR. 1999 Printed in Japan

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17
17
18

M-IS21

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.

(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 60 Hz outlet and turn the AC power switch on. Any
current measured must not exceed 0.5 mA.

Reading should
not be above

0.5 mA

Earth
ground

Device
under
test

Also test with
plug reversed
(Using AC adapter
plug as required)

Test all
exposed metal
surfaces

AC Leakage Test

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
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.

on the schematics and

2

2. EXPLODED VIEWS AND PARTS LIST

NOTES:

2.1 PACKING

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 product are used for disassembly.

M-IS21

4

21

¶ PACKING PARTS LIST

Mark No. Description Part No.

1 Side Pad AL AHA7238
2 Side Pad AR AHA7239
3 Packing Case AMP MY AHD7747
4 Packing Sheet AHG7053

3

3

M-IS21

2.2 EXTERIOR

36

28

32

32

32

36

15

26

36

19

8

36

7

36

32

20

11

36

34

32

14

16

25

27

32

10

31

29

6

9

5

37

38

4

28

C11

C12

36

1

32

32

13

32

4

M-IS21

Caution when disassemble.
Even if the power supply code is pulled out from the outlet, neither C11 nor C12 of AF ASSY are discharged.
Please discharge C11 and C12 of AF ASSY by the resistor of 100 Ω or more before removing AF ASSY or POWER SUPPLY ASSY.
There is a possibility to destroy the transistor, and Please discharge by the resistor of 100 Ω or more.

33

33

30

21

2

18

30

23

12

35

35

(1) EXTERIOR PARTS LIST

Mark No. Description Part No.

1 AF Assy A WU7337
2 AMP Assy AWU7340

3 POWER SUPPLY Assy AWU7344
NSP 4 PRIMARY Assy AWU7345
NSP 5 SECONDARY Assy AWU7350

6 HP Assy AWU7351

7 METER Assy AWU7353

8 METER CONNECT Assy AWU7356

9 Power Transformer ATS7249

10 Fuse (FU1 : T2.5A) REK1026

17

30

33

33

30

22

23

3

Mark No. Description Part No.

21 Holder ANG7009
22 Power PAC Holder ANG7109
23 Heat Sink ANH7058
24 • • • • •
25 Escutcheon A AAK7617

26 Top Panel AAN7192
27 Front Panel A AMB7564
28 Side Bonnet ANE7242
29 Screw With Washer ABA1005
30 Screw ABA1021

11 VU Meter AAW7002
12 DC FAN Motor AXM7003

NSP 13 Chassis A ANA7086

14 Rear Panel See Contrast table (2)
15 Lens A AAK7614

16 Rubber Sheet AEB1111
17 Mold A AMR7005
18 Mold B AMR7006
19 Lens Holder A AMR7245
20 Refrector AMR7248

31 Screw FBT40P060FZK
32 Screw BBZ30P080FMC
33 Screw BBZ30P180FMC
34 Screw BMZ30P060FZK
35 Screw BPZ30P350FZK

36 Screw VPZ30P080FMC
37 Binder ZCA-SKB90BK

NSP 38 BIND Assy AWU7349

(2) CONTRAST TABLE

M-IS21/MYXJ and NVXJ are constructed the same except for the following :

Mark No. Symbol and Description

14 Rear Panel ANC7823 ANC7839

MYXJ Type NVXJ Type

Part No.

Remarks

5

1

23

4

M-IS21

3. SCHEMATIC DIAGRAM

3.1 AF, AMP, POWER SUPPLY, PRIMAR Y , SECONDAR Y, HP, METER and METER
CONNECT ASSYS

A

B

B

AMP ASSY
(AWU7340)

C

POWER
SUPPLY

C

ASSY
(AWU7344)

D

6

1234

CBA