Pioneer a 203 service manual

Page 1

(U) PIONEER;

The Art of Entertainment

ORDER NO.
ARP2 8 5 2
The illustration shows model A-203.
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
A_203M°del A4 03 Power Requirement :gtlleo;ciall1t:gr:eri:2:e converted by the
HEXJ O I O i AC220-230V H I ' ' pica-409*
HBXJ I O O . A0240V l A0220-230V,*
HEWZXJ O O _ A0220-230V fl ACZ4O-V,*W4 O
HLXJ I O O mega-230v AC2AOV, 4r-
SDXJ O O. AC110V/120-127V/220V/240V With-the voltag; selector
YPWXJ -- O A0240V -

:1»: : Alter the wiring of the Power-supply block at the primary winding of Power-transformer referring to the Line Voltage
Selection described in Service Manual.

0 For the following: A-203/HBXJ, HEWZXJ, HLXJ and SDXJ; A-103/HBXJ, HEWZXJ, HLXJ, SDXJ
and YPWXJ, refer to page 22.

CONTENTS
'I. DISASSEMBLY ................................................... 2
2. EXPLODED VIEWS, PACKING AND PARTS LIST 3
3' SCHEMATIC DIAGRAM ....................................... 6
4. PCB CONNECTION DIAGRAMS ........................... 9
5. BLOCK DIAGRAM ............................................. 17
6. PCB PARTS LIST ............................................. 18
7. IC INFORMATION ............................................. 21
8. FOR A-203/HBXJ, HEWZXJ, HLXJ SDXJ,
A-103/HBXJ,HEWZXJ, HLXJ, SDXJ AND YPWXJ 22
9_ PANEL FACILITIES ............................................. 25
1o SPECIFICATIONS ............................................. 28

PIONEER ELECTRONIC CORPORATION 4-1, Meguro l-Chome. Meguro-ku. Tokyo 153. Japan

PIONEER ELECTRONICS SERVICE INC. PO. Box 1760. Long Beach. California 90801 U.S.A.

PIONEER ELECTRONICS OF CANADA, INC. 300 Allstate Parkway Markham. Ontario L3R 0P2 Canada

PIONEER ELECTRONIC [EUROPE] N.V. Haven 1087 Keetberglaan 1. 9120 Melsele. Belgium

PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Australia TEL: [03] 580-9911

© PIONEER ELECTRONIC CORPORATION 1994 0_FFO APR 1994 Printed in Japan

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A-203, A-103 I

1. DISASSEMBLY

O CHECKING FOFl POWER AMP ASSY

be)

. Remove the bonnet.
. Remove the VOLUME knob and unscrew nut the CD (Fig. 1).

. Unscrew the fastening screws Q) of the front panel (2 upper

and 5 lower screws. ).

Unscrew the fastening screws ® (1 screw) and (AD (2 screws)
of the RADIATOR.

Lift up the RADIATOR (in the direction of the arrow 6))
approximately 5mm, and remove it from the chassis hook

Remove the lower hooks © of the front panel (2 places).

Slowly remove the front panel together with the RADIATOR
When doing this, be careful so that the flat cable ® form CN
1 does not get caught.

. When the VOLUME knob shaft Q) has been distanced from

the front panel. lower the fins of the RADIATOR as shown
in Fig. 2 and raise the shaft.

0 HOW TO REMOVE THE POWER AMP ASSY

1.

Remove the fastening screw G) of the RADIATOR (1 screw)
and © (2 screws) and the center fastening screw ® (1
screw) 0f the POWER AMP ASSY (Fig. 1).

2. Lift up the RADIATOR (in the direction of the arrow 6))

3.

approximately 5mm, and remove it from the chassis hook.

Pull the RADIATOR backward and remove the POWER
AMP ASSY and RADIATOR together.

Note : The CONTROL ASSY of the front panel and the

POWER AMP ASSY are connected only with
connectors, and they can the refore be easily removed by
carrying out the above operations.

Fig. 1