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TUNER SECTION
AM Section
Function switch : AM
Volume
Volume
: MIN
FM Section
Function switch : FM
Volume
Volume
: MIN
AM RF signal
generator
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
FM RF signal
generator
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
400Hz signal.
Output level : as low as possible
telescopic
antenna
terminal
antenna
terminal
0.01
µ
F
set
32
Ω
J301 (phones)
level meter
SECTION 5
ADJUSTMENTS
5-2. ELECTRICAL ADJUSTMENTS
TAPE RECORDER SECTION
Standard Output Level
Output terminal
HP OUT
load impedance
32
Ω
output signal level
0.25V (–10dB)
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
0dB = 0.775V
Tape Speed Adjustment
Procedure :
Mode : Playback
set
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
32
Ω
speed checker
LFM-30 or
digital frequency
counter
LFM-30 or
digital frequency
counter
J301 (phones)
Tape speed adjustment
control inside motor
control inside motor
5-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
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 unless otherwise noted.
Torque Measurement
Torque
Torque Meter
Meter Reading
Forward
CQ-102C
30 – 70 g•cm
(0.42 – 0.97 oz•inch)
Forward
CQ-102C
1.5 – 5.5 g•cm
Back Tension
(0.020 – 0.076 oz•inch)
Fast Forward
CQ-201B
more than 60 g•cm
(more than 0.84 oz•inch)
Rewind
CQ-201B
more than 60 g•cm
(more than 0.84 oz•inch)
Tape Tension Measurement
Torque Meter
Meter Reading
CQ-403A
more than 100g
(more than 3.53 oz)
Adjustment Value :
Speed checker
Digital frequency counter
–1 to +1%
2,970 – 3,030Hz
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
should be within 1.5% (45Hz).
Adjustment Location :
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