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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.)
head.)
3. Do not use a magnetized screwdriver for 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
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)
Tape Tension 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.)
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
32
Ω
6
Ω
Output signal level
0.25V (–10dB)
0.775V (0dB)
Test Tape
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-
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
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)
WS-48A
(3kHz, 0dB)
32
Ω
digital frequency
counter
phones jack
IC201
RV303 : Tape Speed Adjustment
[ MAIN BOARD ]
(Component side)
(Component side)
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