Sony WM-EX900 User Manual

5 A-3021-147-A MAIN BOARD, COMPLETE (AEP,KR,JE)
5 A-3021-207-A MAIN BOARD, COMPLETE (FR)
6 3-029-923-01 LID (N), BATTERY CASE (GOLD)
6 3-029-923-11 LID (L), BATTERY CASE (BLUE) (JE)
6 3-029-923-21 LID (B), BATTERY CASE (BLACK) (KR,JE)
9 A-3050-802-A ORNAMENT (OPEN) BLOCK ASSY
9
17 3-029-932-01 ORNAMENT (CASSETTE)
17
18 X-3376-372-1 LID ASSY (N), CASSETTE (GOLD)
18 X-3376-602-1 LID ASSY (L), CASSETTE (BLUE) (JE)
18 X-3376-603-1 LID ASSY (B), CASSETTE (BLACK)
20 3-029-205-01 MD COVER (JE)
20 3-029-205-11 MD COVER (AEP,FR,KR)
22 3-029-921-01 CASE (N) (GOLD)
22 3-029-921-11 CASE (L) (BLUE) (JE)
22 3-029-921-21 CASE (B) (BLACK) (KR,JE)
24 3-029-933-01 KNOB (VOL) (N) (GOLD)
24 3-029-933-11 KNOB (VOL) (L) (BLUE) (JE)
24 3-029-933-21 KNOB (VOL) (B) (BLACK) (KR,JE)
A-3021-259-A MAIN BOARD, COMPLETE (AEP,KR,JE)
A-3021-308-A MAIN BOARD, COMPLETE (FR)
3-029-923-31 LID (NA), BATTERY CASE (GOLD)
3-029-923-41 LID (LA), BATTERY CASE (BLUE) (AEP,KR,JE)
X-3378-432-1 OPEN (SV-H) ASSY, ORNAMENT
(GRAY)…(GOLD)
X-3378-433-1 OPEN (SV-W) ASSY, ORNAMENT
(PEARL WHITE)…(BLUE) (AEP,KR,JE)
3-029-932-11 ORNAMENT (CASSETTE) (GOLD)
3-029-932-21 ORNAMENT (CASSETTE) (BLUE) (AEP,KR,JE)
X-3377-887-1 LID ASSY (N), CASSETTE (GOLD)
X-3377-888-1 LID ASSY (L), CASSETTE (BLUE) (AEP,KR,JE)
3-039-380-11 COVER (A), MD (JE)
3-039-380-21 COVER (A), MD (AEP,FR,KR)
3-039-379-01 CASE (GOLD)
3-039-379-11 CASE (BLUE) (AEP,KR,JE)
3-029-933-31 KNOB (VOL) (NA) (GOLD)
3-029-933-41 KNOB (VOL) (LA) (BLUE) (AEP,KR,JE)
Ver 1.1 2000. 01
WM-EX900
AEP Model
E Model
Tourist Model
SERVICE MANUAL
Part No. Description Remark
• Difference of Exploded Views
WM-EX900 AEP, French, Korean and Tourist model are almost same as WM-EX9 AEP, French, Korean and Tourist model.
This Service Manual contains only the points which differ from WM-EX9 AEP, French, Korean and Tourist model.
However accessories and packing materials are all listed.
For the informations not contained in this manual, please refer to WM-EX9 service manual (9-926-960-∏) previously issued.
Page WM-EX9 (AEP, FR, KR, JE model) WM-EX900 (AEP, FR, KR, JE model)
24
Ref. No. Part No. Description Remark
CASSETTE PLAYER
MICROFILM
• Color Indication of Appearance Parts
Example :
KNOB, BALANCE (WHITE) ... (RED)
RR
Parts Color Cabinet’s Color
• Abbreviation
FR : French model
KR : Korean model
JE : Tourist model

Sony WM-EX900 Specifications

General

Type	Cassette Player
Brand	Sony
Model	WM-EX900
Frequency Response	20 Hz - 20 kHz
Mega Bass	Yes
AVLS (Automatic Volume Limiter System)	Yes
Remote Control	No
Power Supply	1 x AA battery
Wow and Flutter	0.1% WRMS

Summary

Difference of Exploded Views

Difference of Electrical Parts List

Accessories & Packing Materials

Specifications

Servicing Note

Service Mode

Mode to allow mechanical parts to operate with the audio board open.

Rotational System

PLAY Mode Rotational System

Diagram showing gear train for PLAY mode operation.

FF Mode Rotational System

Diagram showing gear train for FF mode operation.

REW Mode Rotational System

Diagram showing gear train for REW mode operation.

General

Location of Controls

Identifies controls on the main unit and stereo headphones.

Disassembly

Cassette Lid Assy Disassembly

Procedure for disassembling the cassette lid assembly.

Case Disassembly

Procedure for disassembling the case of the unit.

Ornament (OPEN) Block Assy Disassembly

Procedure for disassembling the ornament (open) block assembly.

Sub Board, Leaf Switch, Main Board Disassembly

Procedure for disassembling sub board, leaf switch, and main board.

Belt (F1), Motor (F1) Disassembly

Procedure for disassembling the belt and motor.

Mechanical Adjustments

Torque Measurement

Details torque measurements for FWD, REV, and FF/REW modes.

Tape Speed Adjustment

Procedure for adjusting tape speed using a digital frequency counter.

Electrical Adjustments

Tape Speed Adjustment Procedure

Detailed procedure for adjusting tape speed using a digital frequency counter.

Diagrams

Block Diagram

Overall block diagram of the WM-EX900 system.

IC Pin Description

Detailed pin descriptions for system control IC701.

IC Block Diagrams

IC301 TA2123F Block Diagram

Block diagram for IC301 TA2123F.

IC302 NJM2185AV Block Diagram

Block diagram for IC302 NJM2185AV.

IC703 XC6383C251ML Block Diagram

Block diagram for IC703 XC6383C251ML.

IC601 LB1994M Block Diagram

Block diagram for IC601 LB1994M.

IC702 MM1305 Block Diagram

Block diagram for IC702 MM1305.

IC704 S-80808ANNP-E7Y Block Diagram

Block diagram for IC704 S-80808ANNP-E7Y.

Exploded Views

Case Section Exploded View

Exploded view of the case section and its components.

Mechanism Deck Section Exploded View

Exploded view of the mechanism deck and its components.

Electrical Parts List

Capacitors

List of capacitors used in the WM-EX900.

Diodes

List of diodes used in the WM-EX900.

Fuse

List of fuses used in the WM-EX900.

Ferrite Bead

List of ferrite beads used in the WM-EX900.

Integrated Circuits (ICs)

List of integrated circuits used in the WM-EX900.

Resistors

List of resistors used in the WM-EX900.

Jacks

List of jacks used in the WM-EX900.

Jumper Resistors

List of jumper resistors used in the WM-EX900.

Coils

List of coils used in the WM-EX900.

Photo Reflectors

List of photo reflectors used in the WM-EX900.

Transistors

List of transistors used in the WM-EX900.

Network Resistors

List of network resistors used in the WM-EX900.

Variable Resistors

List of variable resistors used in the WM-EX900.

Switches

List of switches used in the WM-EX900.

Vibrator

List of vibrators used in the WM-EX900.

Miscellaneous Components

List of miscellaneous components like head, motor, and solenoid.

Accessories & Packing Materials