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E Model

Chinese Model

2005H02-1

© 2005.08

Model Name Using Similar Mechanism

WM-GX221

Tape Transport Mechanism Type

MT-WMGX221-175

FM: 87.6 - 107.9 MHz
AM: 531 - 1 602 kHz

Playback: 40 - 15 000 Hz
Recording: 100 - 8 000 Hz

Microphone (MIC) jack

Stereo earphones (i) jack
Load impedance: 8 - 300 

Ω

3 V DC batteries R6 (size AA)
x 2

Approx. 112.0 x 82.5 x 38.0 mm
(4 

1

/

2

 x 3 

1

/

4

 x 1 

1

/

2

 inches),excl.

projecting parts and controls

Approx. 210 g (7.4 oz) (main unit only)

Stereo earphones (1)

(JEITA*)

Sony alkaline

Sony R6P(SR)

LR6(SG)**

(using stereo earphones)

Playback

24

7

Radio

48

15

Mic recording

20

4.5

Radio recording

12

3

(using the speaker)

Playback

15

4.5

Radio

26

6

Radio recording

11.5

3

*

Measured by the standard of JEITA (Japan Electronics and Information
Technology Industries Association) (using a Sony HF series cassette tape)

** When using Sony LR6(SG) “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.

Design and specifications are subject to change without notice.

2

··············································································· 3

·························································································· 4

················································································ 5

3-1. Front Cabinet ASSY ······································································· 5
3-2. MAIN Board ··················································································· 6
3-3. Mechanism Deck (MT-WMGX221-175) ······································· 6
3-4. Belt (Cap), M601, HRP901, HE901 ··············································· 7
3-5. Cassette Holder Sub ASSY ····························································· 7

·················································· 8

······················································ 8

······················································································ 10

6-1. Block Diagram – Tuner Section – ················································· 11
6-2. Block Diagram – Main Section – ················································· 12
6-3. Printed Wiring Boards (Side A) ···················································· 13
6-4. Printed Wiring Boards (Side B) ···················································· 14
6-5. Schematic Diagram – MAIN Board (1/2) – ·································· 15
6-6. Schematic Diagram – MAIN Board (2/2) – ·································· 16
6-7. IC Block Diagrams ······································································· 17

······································································ 19

7-1. Overall Section ············································································· 19
7-2. Cabinet (Front) Section ································································· 20
7-3. Mechanism Deck Block-1 (MT-WMGX221-175) ······················· 21
7-4. Mechanism Deck Block-2 (MT-WMGX221-175) ······················· 22

······················································· 23

Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

Flexible Circuit Board Repairing
• Keep the temperature of 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.

3

In this set, record/play mode is detected using the switch S704 (TAPE POWER).
S704 is mounted on the MAIN board. If MAIN board is removed, it becomes impossible to detect
record/play mode.
Where MAIN board is removed, when you measure operation and voltage of each part of the mechanism
deck, please turn on S704.

– MAIN BOARD (SIDE A) —

S704

4

This section is extracted
from instruction manual.

PAUSE.

z REC

FM ST/MONO

ISS

Built -in microphone

SPEAKER/i

i

x STOP

N PLA Y * *

VOLUME*

(RADIO OFF) TAPE/AM/FM

SUPER BASS
(OFF/ON)

TUNING

BATT indicator

Tuning indicato r

MIC (PLUG IN POWER)**

AVLS (NORM/LIMIT)

m REW/REVIEW

M FF/CUE

FM rod antenna

* There is a tactile dot beside VOL on the main unit to show the direction to turn up the

volume.

** The button/jack has a tactile dot.

• LOCATION OF CONTROLS