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Ver 1.1 2001.01
With SUPPLEMENT-1
(9-873-025-81)
WM-GX100
SERVICE MANUAL
RADIO CASSETTE-CORDER
SPECIFICATIONS
E Model
Chinese Model
· Frequency range
FM: 65.0 - 107.9 MHz (Eastern Europe)
87.5 - 108 MHz (Italy and Saudi Arabia)
87.6 - 108 MHz (North, Central and South America)
87.6 - 107.9 MHz (Other countries)
AM:526.5 - 1,606.5 kHz (Italy and Saudi Arabia)
530 - 1,710 kHz (North, Central and South America)
531 - 1,602 kHz (Other countries)
· Power requirement
­ 3V DC batteries R6 (AA) x 2
­ External DC 3 V power sources
· Dimensions
88.8 x 118.6 x 38.0 mm (3 1/2 x 4 3/4 x 1 1/2 inches) (w/h/d)
· Mass
Approx. 160 g (5.7 oz)
· Supplied accessories
Stereo headphones or Stereo earphones (1), Belt clip (1),
Stereo microphone (1)
Design and specifications are subject to change without notice.
Battery life (approximate hours) (EIAJ*)
Sony alkaline LR6 (SG)**
Sony R6P (SR)
playback
24
7
radio
50
16
mic recording
11
3.5
radio recording
10
2.5
* Measured value by the standard of EIAJ (Electronic Industries
Association of Japan). (Using a Sony HF series cassette tape)
** When using LR6 (SG) Sony "STAMINA" alkaline dry batteries
(produced in Japan).
Note
· The battery life may be shorter depending on the operating condition,
the surrounding temperature and battery type.
Model Name Using Mechanism Type
WM-SR1
Similar Mechanism Tape Transport
MF-WMSR1-114


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Specifications ........................................................................... 1
1. GENERAL
Location and Function of Controls .................................... 2
2. DISASSEMBLY
2-1. Cabinet (Rear) ............................................................. 3
2-2. Main Board ................................................................. 4
2-3. Mechanism Deck ........................................................ 4
2-4. Motor (M901), "Head, Magnetic" (HRP901) ............ 5
2-5. Holder Sub ASSY, Cassette ........................................ 5
2-6. Setting the Pointer ...................................................... 6
3. ADJUSTMENTS
3-1. Mechanical Adjustments ............................................. 7
3-2. Electrical Adjustments ................................................ 7
4. DIAGRAMS
4-1. Block Diagram (1/2) ................................................... 9
4-2. Block Diagram (2/2) .................................................. 11
4-3. Printed Wiring Boards .............................................. 13
4-4. Schematic Diagram (1/2) .......................................... 15
4-5. Schematic Diagram (2/2) .......................................... 17
5. EXPLODED VIEWS
5-1. Cabinet Section ......................................................... 21
5-2. Mechanism Deck Section ......................................... 22
6. ELECTRICAL PARTS LIST ................................... 23
Flexible Circuit Board Repairing
· Keep the temperature of the soldering iron around 270
°C during
repairing.
· Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
· Be careful not to apply force on the conductor when soldering or
unsoldering.
Notes on chip component replacement
· Never reuse a disconnected chip component.
· Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
TABLE OF CONTENTS
SECTION 1
GENERAL
LOCATION AND FUNCTION OF CONTROLS
This section is extracted from
instruction manual.


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­ 3 ­
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (REAR)
z
The equipment can be removed using the following procedure.
L
K
J
I
B
C
D
E
F
G
H
2
Cabinet (rear)
(A­ L : Claws)
1
Screws (B 1.7)
A
Align switches and knobs with arrow direction
z
CAUTIONS DURING CABINET (REAR) ASSEMBLY
S310
S308
S2
S305
S307
Cabinet (Front)
Main board
Cabinet (rear)
"Holder sub ASSY, Cassette"
Mechanism deck
(MF-WMSR1-114)
Motor (M901), "Head, Magnetic" (HRP901)
Set


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­ 4 ­
2-3. MECHANISM DECK (MF-WMSR1-114)
2-2. MAIN BOARD
Main board
3
Screw (M1.4)
2
Head flexible board
(CN301)
1
Remove solder (4 places)
(M901)
4
Claws
5
1
Claws
Mechanism deck
(MF-WMSR1-114)
2


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­ 5 ­
2-5. HOLDER SUB ASSY, CASSETTE
2-4. MOTOR (M901), "HEAD, MAGNETIC" (HRP901)
1
Belt
Belt
3
Motor (M901)
2
Screws (M1.4)
4
"Head, Magnetic"
(HRP901)
Wheel ASSY (NP), capstan
How to apply the belt
M901
2
4
Holder sub ASSY, cassette
3
Spring (tortion)
Hinge
1
Move hinge awsy
from projection
1
Move hinge awsy
from projection
Hinge