Page 1
- 2 -
Section Title Page
SECTION 1. SERVICE NOTE ................................. 3
SECTION 2. GENERAL .......................................... 5
SECTION 3. DISASSEMBLY
3-1. Cassette Lid ASSY and Case ASSY ................................. 7
3-2. Bracket ASSY and Cassette Holder ASSY ....................... 7
3-3. Tuner Board ....................................................................... 8
3-4. Main Board ......................................................................... 8
SECTION 4. MECHANICAL ADJUSTMENT .......... 9
SECTION 5. ELECTRICAL ADJUSTMENT ........... 9
SECTION 6. DIAGRAMS
6-1. IC Pin Functions
IC501 BA3641FV REC AMP ......................................... 11
IC701 MSM63120B System Control .............................. 11
IC702 SMC62L3A LCD Drive ....................................... 13
6-2. Printed Wiring Board - Tuner Section - ..................... 14
6-3. Schematic Diagram - Tuner Section - ........................ 17
6-4. Schematic Diagram - Main Section - ......................... 21
6-5. Printed Wiring Board - Main Section - ...................... 25
6-6. IC Block Diagrams .......................................................... 29
SECTION 7. EXPLODED VIEWS
7-1. Case Section ..................................................................... 33
7-2. Main Board Section ......................................................... 34
7-3. Mechanism Section (MF-WMGX614-112) ..................... 35
SECTION 8. ELECTRICAL PARTS LIST ............. 36TABLE OF CONTENTS
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED
LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
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 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 solder-
ing or unsoldering.
Page 2
- 3 -
[MAIN Board]
- Side A -
- Side B -
[Lever (FR SW)]
SECTION 1
SERVICE NOTE
[Service Mode]
Mode which enables the mechanism to be operated with the
MAIN board opened.
Photo sensor PH701 mounted on the MAIN board is used to
detect rotaion of the reels. Because it is mounted on the MAIN
board, when the MAIN board is being removed, rotation of the
reels cannot be detected and the auto-off/tape-end detector
circuit does not operate correctly.
F/R switch (S701) is also mounted on the MAIN board.
Therefore, without the MAIN board, the head cannnot be
placed in playback position, and power cannot be supplied to
the circuitry of the playback system.
When the MAIN board is being removed, follow the
procedures below, in order to check operation of the
mechanisms of the tape deck and to check voltages supplied to
each circuit.
1. Setting
1) Refer to Disassembly and remove the cabinet and open
the MAIN board.
2) Connect the MAIN board to the motor and plunger using a
jumper wire. Use Extension tool (1-769-143-11)) (one set
10 tools) to make connection simple.
3) Short-circuit the service mode land (BP2) by soldering.
4) Apply a square wave signal to TP20. (See the figure on the
right.)
5) Supply 1.5V to the battery terminals (+) and (-“) using a
DC power supply.
2. Preset State
This state must be set to set the PLAY, FF, and REW
modes.
1) Check that the lever (FR SW) is at the center and F/R
switch (S701) is at the center. If not, set the preset state as
follows.
2) Move the F/R switch (S701) according to the side faced by
the lever (FR SW).
3) Turn OFF the DC power supply switch once and then turn
it ON again so that the lever (FR SW) can be moved.
Move the F/R switch (S701) according to this timing and
set to the center.
3. FF REW Mode
1) Set the preset state and press the FF switch and REW
switch.
4. PLAY Mode
1) Set the preset state.
2) Press the ~ switch. The lever (FR SW) will move to the F
side once and then to the R side. Move the F/R switch
(S701) according to this timing to set the PLAY (R side)
mode. Press the ~ switch another time and move the F/R
switch (S701) according to the movement of the lever (FR
SW) to set the PLAY (F side) mode.
Note 1 : If the above cannot be performed, start again from
preset.
Note 2 : Use the remote control ~, &, FF, and REW switches
as much as possible. If the remote control is not
available, do not touch S703 to S706 with the hand
and use something with a round tip to press them.
F side
R sideCenter
Lever (FR SW)
CenterF side
R sideS701 F/R SWITCH
(FWD n STOP n REV) PH701S702
(HOLDER
SWITCH)
S714
(C HOLD)
S707
(RADIO ON
BAND) S711
(TUNING +)S712
(TUNING -“) S713
(ENTER)Connect to
plunger
S703
(RADIO OFF p)
S704
(REPEAT Å“) Battery Terminal (-“)
S709
(SET)S710
(MENU)S706
(AMS REW
PRESET -“)
Service
mode landS705
(AMS FF
PRESET +)Connect to
motor Battery
Terminal (+)
TP20 AF OSCILLATORSQUARE WAVE (SINE WAVE)
10Hz
3.5 dB (1.5V)
