– 7 –
SECTION 3
ADJUSTMENTS
3-2. ELECTRICAL ADJUSTMENTS
PRECAUTION
•
Supplied voltage : 2.5V.
•
Switch and control position
MEGA BASS : OFF
VOLUME control : maximum
AVLS : NORM
PB EQ : NORM
ISS : 1
FM MODE : ST
TAPE SECTION
Test Tape
Used for
Tape Speed Adjustment
1. Playback WS-48A (tape center part) and adjust RV601 so that
the frequency counter reading becomes 3,000Hz.
Standard value : 2,985–3,015Hz
2. Playback WS-48A (tape top and end) .
Check that frequency counter reading is within
±
1.5% of the
reading of step 1.
0 dB = 0.775V
set
frequency counter
16
Ω
phones jack (J301)
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 with a head demagnetizer.
Do not use a magnetized screwdriver for the adjustments.
3. These measurement and adjustment should be performed with
the rated power supply voltage (2.5 V) unless otherwise noted.
Torque Measurement
Mode
Torque meter
Meter reading
1.97 – 2.94 mN•m
FWD
(20 – 30 g • cm)
CQ-102D
(0.28 – 0.41 oz• inch)
FWD
less than 0.19 mN•m
(less than 2 g • cm)
back tension
(less than 0.027 oz• inch)
more than 3.93 mN•m
FF, REW
CQ-201B
(more than 40 g • cm)
(more than 0.56 oz• inch)
RV601 : Tape speed Adjustment
TUNER SECTION
AM Section
BAND : AM
FM Section
BAND : FM
0 dB = 1
µ
V
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.
set
16
Ω
phones jack (J301)
level meter
CT1-2
3
FM RF signal
generator
22.5kHz frequency
deviation by 400Hz signal.
Output level :
as low as possible
ANT (TP30)
0.01
µ
F
MAIN BOARD (SIDE A)
Adjustment Location :
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TEL 13942296513 QQ 376315150 892498299
