Adjustments; Mechanical Adjustments; Electrical Adjustments - Sony CFS-515L Service Manual

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4-1. MECHANICAL ADJUSTMENTS

PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
rubber belt
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
Playback CQ-102C
Back Tension CQ-102C
Rewind
CQ-201B
Fast Forward
Tape Tension Measurement
TE Mode Tension Meter
L 13942296513
FWD CQ-403A

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
• • • • • • • • • • • • • • • • •
PRESET MODE
• • • • • • • • • • • • • • • • • • • • •
GRAPHIC EQUALIZER
• • • • • • • •
BALANCE
• • • • • • • • • • • • • • • • • • • • • • • • • • • • •
VOLUME
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
MEGA BASS
• • • • • • • • • • • • • • • • • • • • • • • • •
Standard Output Level
Output terminal PHONES
Load impedance 32Ω
Output signal level 0.25V (–10dB)
www
Test Tape
Type Signal
.
WS-48A 3kHz, 0dB
0dB=0.775V
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SECTION 4

ADJUSTMENTS

playback head
erase head
capstan
Meter Reading
18 – 60 g • cm
(0.25 – 0.83 oz• inch)
1 – 5 g • cm
(0.014 – 0.069 oz• inch)
45 – 95 g • cm
(0.63 – 1.31 oz• inch)
Meter Reading
more than 60g (2.12 oz)
TAPE (RADIO OFF)
MANUAL
center click
center click
MAX
mechanical center
SP (FRONT) OUT
6Ω
0.775V (0dB)
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Used for
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Tape Speed Adjustment
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Tape Speed Adjustment
Procedure :
Mode : Playback
test tape
WS-48A
(3kHz, 0dB)
set
(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 :
Q Q
3 6 7 1 3 1 5
[ MAIN BOARD ]
(Component side)
co
.
9 4 2 8
digital frequency
counter
32 Ω
phones jack
RV303 : Tape Speed Adjustment
0 5 8 2 9 9 4 2 8
IC201
m
9 9
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