– 8 –
SECTION 4
ADJUSTMENTS
4-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :record/playback head playback head
pinch roller erase head
rubber belt capstan
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
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 unless otherwise noted.
Torque Measurement
Torque Torque Meter Meter Reading
Playback CQ-102C 18 – 60 g • cm
(0.25 – 0.83 oz• inch)
Back Tension CQ-102C 1 – 5 g • cm
(0.014 – 0.069 oz• inch)
Rewind CQ-201B 45 – 95 g • cm
Fast Forward (0.63 – 1.31 oz• inch)
TapeTension Measurement
Mode Tension Meter Meter Reading
FWD CQ-403A more than 60g (2.12 oz)
4-2. ELECTRICAL ADJUSTMENTS
TAPE SECTION
1. The adjustments should be performed in the order give in the
service manual. (As a general rule, playbak circuit adjustment
should be completed before performing recording circuit adjust-
ment.)
2. The adjustments should be performed for both L-CH and R-CH
unless otherwise indicated.
• Switch location
FUNCTION switch • • • • • • • • • • • • • • • • • TAPE (RADIO OFF)
PRESET MODE • • • • • • • • • • • • • • • • • • • • • MANUAL
GRAPHIC EQUALIZER • • • • • • • • center click
BALANCE • • • • • • • • • • • • • • • • • • • • • • • • • • • • • center click
VOLUME• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • MAX
MEGA BASS • • • • • • • • • • • • • • • • • • • • • • • • • mechanical center
Standard Output Level
Output terminal PHONES SP (FRONT) OUT
Load impedance 32Ω6Ω
Output signal level 0.25V (–10dB) 0.775V (0dB)
TestTape
Type Signal Used for
WS-48A 3kHz, 0dB Tape Speed Adjustment
0dB=0.775V
Tape Speed Adjustment
Procedure :
Mode : Playback
(Normal speed)
1. Deck A to playback mode.
2. Adjust the RV303 for 2,985 – 3,015Hz reading on digital fre-
quency counter.
3. Frequency difference between the beginning and the end of the
tape should be within 1% (30Hz).
(High speed)
4. Deck B to record mode.
5. Deck A to high speed playback mode.
6. Confirm that the reading of the digital voltmeter becomes 5,500
– 6,500Hz.
7. Frequency difference between the beginning and the end of the
tape should be within 1% (30Hz).
Adjustment Location :
set
test tape
WS-48A
(3kHz, 0dB) 32
Ω
digital frequency
counter
phones jack
IC201
RV303 : Tape Speed Adjustment
[ MAIN BOARD ]
(Component side)
