– 5 –
– 6 –
– 8 –
– 7 –
– 9 –
1
Screws
(1.7x3) tapping
Retainer, Speaker
Speaker
Cassette holder sub assy
Switch board
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
TUNER SECTION
AM Section
BAND : AM
FM Section
BAND : FM
LOCAL/DX switch : DX
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
Adjustment Location :
[
MAIN BOARD] (Side A)
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 F
µ
set
16
Ω
+
–
J302 (phones)
level meter
AM IF ALIGNMENT
Adjust for a maximum reading on level meter.
T1
1,000kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
505kHz
CT1–4
1,750kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
620kHz
CT1–1
1,400kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
86.0MHz
CT1–3
109.5MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
86.0MHz
CT1–2
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
SECTION 3
ADJUSTMENTS
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
Mode
Torque Meter
Meter Reading
FWD
CQ-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
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 3,000 ± 15Hz.
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
Ω
RV601
SECTION 4
DIAGRAMS
4-1. BLOCK DIAGRAM
S 3 0 2
( M D P O W E R )
S 3 0 4 - 1
S 3 0 4
F M
A M
TA P E
R A D I O
O F F
R V 6 0 1
TA P E
S P E E D
D C I N 3 V
• Signal path.
: FM
: PB
WM-PA1