MICROFILM
WM-SP1
SERVICE MANUAL
RADIO CASSETTE PLAYER
SPECIFICATIONS
AEP Model
E Model
Model Name Using Similar Mechanism
WM-FX123
Tape Transport Mechanism Type
MF-WMFX103-48CY
Radio
FM : 87.5 108MHz (Saudi Arabia model)
65 107.9MHz (East European model)
87.6 107.9MHz (AEP, E model)
AM : 526.5 1,606.5kHz (Saudi Arabia model)
531 1,602kHz (AEP, East European, E model)
Power requirements
· 3V DC batteries R6 (AA) x 2
· External DC 3V power sources
Dimensions
94.2x 119.0 x 36.0 mm (w/h/d)
(3 3/4 x 4 3/4 x 1 7/16 in) incl. projecting parts
Mass
Approx. 180g (6.4oz)
Approx. 260g (9.2oz) incl. batteries and cassette
Supplied accessories
· Stereo headphones or earphones (1)
· Belt clip (1)
Design and specifications are subject to change without notice.
Ver 1.0
1998.04
2
TABLE OF CONTENTS
Specifications ........................................................................... 1
1. GENERAL
Location and Function of Controls .................................... 2
2. DISASSEMBLY
2-1. Cabinet (Rear) Removal ............................................. 3
2-2. Cabinet (Front) Removal ............................................ 3
2-3. Main Board, Mechanism Deck Removal ................... 4
2-4. Cassette Holder Sub Assy Removal ........................... 4
2-5. Switch board Removal ............................................... 5
2-6. Dial Pointer Setting .................................................... 5
3. ADJUSTMENTS
3-1. Mechanical Adjustments ............................................ 6
3-2. Electrical Adjustments ................................................ 6
4. DIAGRAMS
4-1. Block Diagram ............................................................ 8
4-2. Printed Wiring Boards .............................................. 10
4-3. Schematic Diagram ................................................... 15
5. EXPLODED VIEWS
5-1. Cabinet and Board Section ....................................... 19
5-2. Mechanism Deck Section ......................................... 20
6. ELECTRICAL PARTS LIST ................................... 21
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.
· HOW TO CHANGE THE CERAMIC FILTERS
This model is used two ceramic filters of CF2 and X2.
You must use same type of color marked ceramic filters in order
to meet same specifications.
Therefore, the ceramic filter must changed two pieces together
since it's supply two pieces in one package as a spare parts
SECTION 1
GENERAL
LOCATION AND FUNCTION OF CONTROLS
Mark
Center Frequency
red
10.70MHz
blue
10.67MHz
orange
10.73MHz
black
10.64MHz
white
10.76MHz
mark
mark
CF2
X2
NORM LIMIT
AVLS
NORM CrO2/
METAL
FM ST MONO
FM
AM
T
APE
(RADIO
OFF)
PLAY
SPEAKER
SPEAKER
SWITCH
DC IN 3V
VOLUME
TUNING
p
2
0 )
3
SECTION 2
DISASSEMBLY
Note:Followthedisassemblyprocedureinthenumericalordergiven.
rTheequipmentcanberemo
vedusingthef
ollo wingpr ocedure .
2-1. CABINET (REAR) REMOVAL
2-2. CABINET (FRONT) REMOVAL
Main board, Mechanism deck
Cabinet (Front)
Cabinet (Rear)
Cassette holder sub assy
Switch board
Set
Cassette holder sub assy
Cabinet (Rear)
1
2
2
3
3
7
7
7
7
7
4
4
6
6
6
5
8
Cabinet (Front)
1 Flexible board
2
4
2-3. MAIN BOARD, MECHANISM DECK REMOVAL
2-4. CASSETTE HOLDER SUB ASSY REMOVAL
NOTE FOR INSTALLATION
Thetorsionspringwillberemovedtogetherwiththecassettelidthatpreformthefollowingforinstallation.
r
TORSION SPRING
Main board
Mechanism deck
1 Remove solder
2 Head flexible board
3 Claw
3 Claws
4
Cabinet (Front)
3 Flexible board
Cassette holder sub assy
2
4
1
1 Attach the torsion spring
as shown in the figure
2 Insert the torsion spring
in the hole as shown in the figure.
3 Lift the torsion spring in the arrow
direction and hook it properly
5
6
8
7
9
2-5. SWITCH BOARD REMOVAL
2-6. DIAL POINTER SETTING
2 Align pointer with arrow marked
side as shown in Fig. 1 and then
fit to groove in the order of
a and b.
1 Rotate tune knob fully to arrow direction.
3
Align point
Ferrite-rod antenna sub assy
A
B
(A=B)
Align point
Pointer
b
a
Fig. 1
Pointer
Ferrite-rod antenna sub assy
Knob (tune)
Main board
1 Screws (1.7x3) tapping
Retainer, Speaker
Speaker
Cassette holder sub assy
Switch board
2
SECTION 3
ADJUSTMENTS
3-2. ELECTRICAL ADJUSTMENTS
PRECAUTION
· Specified voltage : 2.5V.
· Switch and control position
TAPE switch
: NORM
VOLUME control
: maximum
AVLS switch
: NORM
TAPE SECTION
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
Tape Speed Adjustment
Procedure:
Play back WS-48A (tape center part) and adjust RV601 so that the
frequency counter reading becomes 3,015 2,985Hz.
Frequency difference the beginning and the end of the tape should
be within 1.5%.
Adjustment Location :
set
test tape
WS-48A
(3kHz, 0dB)
frequency counter
+
--
J302 (phones)
16
RV601
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback head
pinch roller
capstan
rubber belt
2. Demagnetize the playback head using a head demagnetizer.
3. Do not use a magnetized screwdriver for adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power sup-
ply voltage (2.5V) unless otherwise noted.
Torque Measurement
Torque
Torque Meter
Meter Reading
FWD
20 42 g · cm
CQ-102C
(0.28 0.58 oz· inch)
FWD
less than 2 g · cm
back tension
(less than 0.03 oz· inch)
FF, REW
CQ-201B
more than 60g · cm
(more than 0.83 oz· inch)
Tape Pulling Force Measurement
Torque
Torque Meter
Meter Reading
FWD
CQ-403A
more than 40 g
(more than 1.42 oz)
TUNER SECTION
AM Section
BAND : AM
FM Section
BAND : FM
FM ST/MONO switch : FM ST
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
FM RF signal
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
(ANT TAP)
(GND)
0.01
µF
set
16
+
--
J302 (phones)
level meter
AM IF ALIGNMENT
Adjust for a maximum reading on level meter.
T1
455kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
505kHz
< 516.5kHz >
[515kHz]
CT1 4
1,750kHz < 1,631.5kHz > [1,670kHz]
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
620kHz
< 800kHz >
CT1 1
1,400kHz
< 1,300kHz >
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
86.0MHz
< 87.35MHz > [64.0MHz]
CT1 3
109.5MHz < 108.25MHz > [109.5MHz]
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
86.0MHz
< 87.35MHz > [68.0MHz]
CT1 2
109.5MHz < 108.25MHz > [109.5MHz]
CT1- 4 : AM Frequency Coverage Adjustment
L4 : AM Frequency Coverage Adjustment
L3 : FM Frequency Coverage Adjustment
CT1-3 : FM Frequency Coverage Adjustment
T1 : AM IF Alignment
L1 : AM Tracking Adjustment
CT1- 1 : AM Tracking Adjustment
L2 : FM Tracking Adjustment
CT1- 2 : FM Tracking Adjustment
Adjustment Location :
[MAIN BOARD] (Side A)
· Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
<
> : Saudi Arabia model
[
] : East European model
· Signal path.
F
: FM
E
: PB
SECTION 4
DIAGRAMS
4-1. BLOCK DIAGRAM
WM-SP1