6. ELECTRICAL P ARTS LIST ................................21
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.
• HOW TO CHANGED THE CERAMIC FILTERS
This model is used two ceramic filters of CF2 and X2.
Y ou must used 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
MarkCenter Frequency
red10.70MHz
blue10.67MHz
orange10.73MHz
black10.64MHz
white10.76MHz
LOCATION AND FUNCTION OF CONTROLS
••
NORM LIMIT
AVLS
SPEAKER
SWITCH
SPEAKER
DC IN 3V
SECTION 1
GENERAL
VOLUME
2
TUNING
p
0 )
••
NORM CrO
METAL
DX LOCAL
FM AM TAPE
(RADIO OFF)
2
/
PLAY
– 2 –
Page 3
SECTION 2
DISASSEMBLY
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The equipment can be removed using the following procedure.
Set
Cabinet (Rear)
Cabinet (Front)
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (REAR) REMOVAL
1
Main board, Mechanism deck
4
Cassette holder sub assySwitch board
Cassette holder sub assy
2
2
3
3
2-2. CABINET (FRONT) REMOVAL
7
7
7
4
7
7
Cabinet (Rear)
6
6
6
5
8
1
Flexible board
2
Cabinet (Front)
– 3 –
Page 4
2-3. MAIN BOARD, MECHANISM DECK REMOVAL
k
y
2
Head flexible board
3
Claw
2-4. CASSETTE HOLDER SUB ASSY REMOVAL
4
1
Remove solder
Main board
Mechanism dec
3
Claws
Cabinet (Front)
3
Flexible board
1
2
Cassette holder sub ass
4
NOTE FOR INSTALLATION
The torsion spring will be removed together with the cassette lid that preform the following for installation.
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TORSION SPRING
1
Attach the torsion spring
as shown in the figure
3
Lift the torsion spring in the arrow
direction and hook it properly
2
Insert the torsion spring
in the hole as shown in the figure.
– 4 –
Page 5
1
Screws
(1.7x3) tapping
Retainer, Speaker
Speaker
Cassette holder sub assy
Switch board
y
)
r
t
SECTION 3
S302
(MD POWER)
S304 - 1
S304
FM
AM
TAPE
RADIO
OFF
RV601
TAPE
SPEED
DC IN 3V
ADJUSTMENTS
WM-P A1
SECTION 4
DIAGRAMS
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.
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback headpinch roller
capstanrubber 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 supply voltage (2.5V) unless otherwise noted.
Torque Measurement
TorqueTorque MeterMeter Reading
FWD
CQ-102C
20 – 42 g • cm
(0.28 – 0.58 oz• inch)
FWDless than 2 g • cm
back tension(less than 0.03 oz• inch)
FF, REWCQ-201B
more than 60g • cm
(more than 0.83 oz• inch)
Tape Pulling Force Measurement
ModeTorque MeterMeter Reading
FWDCQ-403A
more than 40 g
(more than 1.42 oz)
3-2. ELECTRICAL ADJUSTMENTS
PRECAUTION
• Specified voltage : 2.5V.
• Switch and control position
TAPE switch: NORM
VOLUME control: maximum
AVLS switch: NORM
T APE SECTION
Test T ape
TypeSignalUsed for
WS-48A3kHz, 0dBTape Speed Adjustment
Tape Speed Adjustment
Procedure :
test tape
WS-48A
(3kHz, 0dB)
set
Play back WS-48A (tape center part) and adjust RV601 so that
the frequency counter reading becomes 3,000 ± 15Hz.
Frequency difference the beginning and the end of the tape
should be within 1.5%.
Adjustment Location :
frequency counter
16
Ω
J302 (phones)
+
–
TUNER SECTION
AM Section
BAND : AM
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
FM Section
BAND : FM
LOCAL/DX switch : DX
FM RF signal
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
set
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
Put the lead-wire
antenna close to
the set.
Ω
16
J302 (phones)
µ
0.01 F
level mete
+
–
(ANT TAP
(GND)
AM IF ALIGNMENT
Adjust for a maximum reading on level meter.
T11,000kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4505kHz
CT1–41,750kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1620kHz
CT1–11,400kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L386.0MHz
CT1–3109.5MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L286.0MHz
CT1–2109.5MHz
4-1. BLOCK DIAGRAM
Ferrite-rod antenna sub assy
Main board
a
Pointer
3
Ferrite-rod antenna sub ass
[MAIN BOARD] (Side A)
Adjustment Location :
b
Pointer
Fig. 1
Knob (tune)
1
Rotate tune knob fully to arrow direction.
– 5 –– 6 –– 8 –– 7 –– 9 –
Align point
A
(A=B)
B
Align point
RV601
CT1–4 : AM Frequency Coverage Adjustment
CT1–3 : FM Frequency Coverage Adjustment
T1 : AM IF Alignment
L4 : AM Frequency Coverage Adjustmen
L3 : FM Frequency Coverage Adjustment
L2 : FM Tracking Adjustment
CT1–2 : FM Tracking Adjustment
CT1–1 : AM Tracking Adjustment
L1 : AM Tracking Adjustment
• Signal path.
: FM
: PB
Page 6
4-3. SCHEMATIC DIAGRAM
STEREO
DECODER
SWHYS
ST
LED
TU
LED
FM
DET
VCO
PHASE
COM
PHASE
COM
FREQ.
DIVIDER
FM/AM
MONO SW
FM
IF
L
DET
AM
IF
PRE
AF
AM
OSC
FM
OSC
AM
MIX
FM
MIX
FM
RF
AM
RF
AM
DET
AM
AGC
1
2423222120181716151413
23456789101112
19
AM RF INFM RF IN
GND1
FM MIX
AM MIX
AGC
VCC2
AM IF IN
FM IF IN
GND2
TUN LED
ST LED
QUAD
FM RF OUT
VCC1
FM OSC
AM OSC
DET OUT
MPX IN
LPF1
LPF2
VCO
L OUT
R OUT
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IC BLOCK DIAGRAM
IC1 TA8122AF
WM-PA1
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics and
tantalums.
• All resistors are in Ω and 1/
specified.
¢
•
: internal component.
4
W or less unless otherwise
•: B+ Line.
•: adjustment for repair.
• Power voltage is dc 3V and fed with regulated dc power
supply from external power voltage jack (J301).
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
() : AM
<> : PLAY
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
• Signal path.
: FM
: PB
– 15 –– 16 –– 18 –– 17 –
Page 7
NOTE :
• -XX, -X mean standardized parts, so they
may have some difference from the original
one.
• Items marked “ * ”are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
5-1. CABINET AND BOARD SECTION
12
11
SP1
SECTION 5
EXPLODED VIEWS
• The mechanical parts with no reference
number in the exploded views are not
supplied.
• Accessories and packing materials are given
in the last of this parts list.
J3011-750-061-11 JACK,DC(POLARITY UNIFIED TYPE)(DC IN 3V)
J3021-565-287-11 JACK (2)
R4101-216-001-00 METAL CHIP105%1/10W
R4111-216-097-91 METAL GLAZE100K5%1/10W
R6011-217-905-11 METAL GLAZE1.55%1/10W
R6021-216-298-00 METAL CHIP2.25%1/10W
R6031-216-043-91 METAL GLAZE5605%1/10W
< JUMPER RESISTOR >
JC11-216-295-00 METAL CHIP05%1/10W
JC41-216-295-00 METAL CHIP05%1/10W
JC51-216-295-00 METAL CHIP05%1/10W
R11-216-009-00 METAL CHIP225%1/10W
R21-216-081-00 METAL CHIP22K5%1/10W
R31-216-077-00 METAL CHIP15K5%1/10W
R41-216-077-00 METAL CHIP15K5%1/10W
R51-216-037-00 METAL CHIP3305%1/10W
R61-216-065-00 METAL CHIP4.7K5%1/10W
R71-216-065-00 METAL CHIP4.7K5%1/10W
R1011-216-006-11 METAL GLAZE165%1/10W
R1021-216-077-00 METAL CHIP15K5%1/10W
R2011-216-006-11 METAL GLAZE165%1/10W
R2021-216-077-00 METAL CHIP15K5%1/10W
R3011-216-089-91 METAL GLAZE47K5%1/10W
R3021-216-073-00 METAL CHIP10K5%1/10W
R3041-216-308-00 METAL CHIP4.75%1/10W
R3051-216-081-00 METAL CHIP22K5%1/10W
R3061-216-073-00 METAL CHIP10K5%1/10W
R3221-216-097-91 METAL GLAZE100K5%1/10W
R4011-216-097-91 METAL GLAZE100K5%1/10W
R4021-216-097-91 METAL GLAZE100K5%1/10W
R4031-216-113-00 METAL CHIP470K5%1/10W
R4041-216-049-91 METAL CHIP1K5%1/10W
R4051-216-057-00 METAL CHIP2.2K5%1/10W
R4061-216-049-91 METAL GLAZE1K5%1/10W
R4071-216-057-00 METAL CHIP2.2K5%1/10W
R4081-216-089-91 METAL GLAZE47K5%1/10W