MICROFILM
SERVICE MANUAL
CASSETTE PLAYER
AEP Model
E Model
Tourist Model
SPECIFICATIONS
WM-EX570
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol
a are trade-
marks of Dolby Laboratories Licensing Corporation.
Model Name Using Similar Mechanism
NEW
Tape Transport Mechanism Type
MT-WMEX550-125
Photo: Black model
Ver 1.0 1999. 02
2
Flexible Circuit Board Repairing
· Keep the temperature of the soldering iron around 270 °C dur-
ing 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
1.
SERVICING NOTES ............................................... 3
2.
GENERAL ................................................................... 5
3.
DISASSEMBLY ......................................................... 6
4.
MECHANICAL ADJUSTMENTS ....................... 11
5.
ELECTRICAL ADJUSTMENTS ......................... 11
6.
DIAGRAMS
6-1. Block Diagram ................................................................ 12
6-2. Printed Wiring Board ...................................................... 14
6-3. Schematic Diagram ......................................................... 17
6-4. IC Pin Function Description ........................................... 23
7.
EXPLODED VIEWS ................................................ 25
8.
ELECTRICAL PARTS LIST ............................... 28
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 PUB-
LISHED BY SONY.
3
SECTION 1
SERVICING NOTES
1. Setting
1) Refer to "3. DISASSEMBLY", and remove the cabinet and
open the MAIN board.
2) Connect the MAIN board to the M901 (motor) and PM901
(plunger) using jumper wires.
3) Short the ATS terminals.
4) Press and fixed the S701 (CASSETTE HOLDER).
5) Supply 1.5V to the battery terminals
` and ' using a stabi-
lized power supply.
2. FF, REW Modes
1) Input a square wave to the TP35 (PHOTO IN) and TP23
(GND). (See figure below)
2) Press the S704 (STOP) for selecting STOP mode.
3) Press the S706 (FF) or S707 (REW).
3. PLAY mode
1) Input a square wave to the TP35 (PHOTO IN) and TP23
(GND). (See figure below)
2) Press the S704 (STOP) for selecting STOP mode.
3) Press the S705 (PLAY). (Each time the switch is pressed, the
mode is changed over)
This set detects the rotation of GEAR (S) using the PH701 (photo
reflector). The PH701 is mounted on the MAIN board, and there-
fore the GEAR cannot be detected with the MAIN board removed.
As a result, the motor cannot be controlled, causing malfunction.
Further, the S702 (FWD/REV switch) is also mounted on the MAIN
board, and with the board removed, the mechanism position
cannnot be detected and the operation is not changed over.
Therefore, when the voltage check is executed with the MAIN
board removed, follow the procedure provided below.
Note : Do not move the S702 swithc position when removing the MAIN
board.
If it is moved, the set will not be changed over to the selected mode.
In this case, reconnect the MAIN board to the set and retry the
work from the beginning.
-- MAIN BOARD (Side B) --
AF
oscillator
square wave
10 Hz, 3.5 dB
S702
IC701
S705 (PLAY)
S704 (STOP)
TP23
(GND)
FWD
REV
S706 (FF)
S707 (REW)
RV601
connect to
M901 (motor)
battery terminal
PH701
TP35
PHOTO
IN
battery terminal
ATS terminals
(to S901)
connect to
PM901 (plunger)
S701
CASSETTE
HOLDER
+
4
Lever (SW)
Rotation system
Rotation system during PLAY.
Rotation system during FF.
Rotation system during REW.
senter
lever (SW)
side R
side F
Pulley (reverse)
flywheel (R) assy
flywheel (N) assy
gear (Y)
gear (TA)
gear (TB)
gear (S)
motor pulley
gear (REEL)
(S side)
gear (NR)
(REV: right side/
FWD: left side)
gear (REEL)
(T side)
clutch assy (M)
gear (TB)
gear (REEL)
(T side)
gear (Y)
gear (NR)
motor pulley
pulley (reverse)
clutch assy (M)
flywheel (R) assy
flywheel (N) assy
gear (FR)
(FF: left side)
gear (NR)
gear (Y)
gear (S)
flywheel (N) assy
flywheel (R) assy
pulley (reverse)
clutch assy (M)
motor pulley
gear (REEL)
(S side)
gear (FR)
(REW: right side)
5
SECTION 2
GENERAL
This section is extracted from
instruction manual.