Mechanical Adjustments; Electrical Adjustments; Tape Deck Section - Sony CFS-616S Service Manual

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MECHANICAL ADJUSTMENTS

3 7 63 1515 0
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback head
playback head
erase head
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 the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
Mode
Playback
Back tension
Rewind
Fast forward
Tape Tension Measurement
TE
L 13942296513
Tension Meter
CQ-403A
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SECTION 4
pinch rollers
rubber belts
idlers
DECK A DECK B
Torque Meter Meter Reading
30 – 75 g•cm
CQ-102C
(0.42 – 1.04 oz•inch)
1.5 – 6.0 g•cm
CQ-102C
(0.021 – 0.083 oz•inch)
Deck-A: More than 60 g•cm
(More than 0.84 oz•inch)
CQ-201B
Deck B: More than 50 g•cm
(More than 0.70 oz•inch)
DECK A DECK B
Meter Reading
Deck-A: More than 90 g (3.18 oz)
Deck-B: More than 100 g (3.53 oz)
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ELECTRICAL ADJUSTMENTS

8

TAPE DECK SECTION

1. The adjustments should be performed in the order given in the
service manual. (As a general rule. Playback circuit adjust-
ment should be completed before performing recording cir-
cuit adjustment.)
2. The adjustments should be performed for both L-ch and R-ch
unless otherwise indicated.
• Switch and control position
FUNCTION switch ............................. TAPE (RADIO OFF)
BALANCE control ............................. center click
MEGA BASS control ......................... mechanical center
BALANCE control ............................. center click
PRESET MODE switch ...................... MANUAL
VOLUME control ............................... maximum
Standard Output Level
Load impedance
Output level
Test Tape
Type
WS-48B
Tape Speed Adjustment
Q Q
3 6 7 1 3
Procedure:
Mode: FWD/REV playback (DECK A)
FWD playback (DECK B)
test tape
WS-48B
(3kHz, 0 dB)
1. Set playback mode (normal speed).
2. Make sure that the value indicated on the frequency counter
falls into the specification.
3. If out of specification, adjust RV303 so that the value on the
frequency counter becomes 3 kHz.
Specifications: 2,985 to 3,015 Hz
4. Adjust so that the frequency at the beginning and that at the
end of tape winding are between 2,970 and 3,030 Hz.
5. Set high speed dubbing mode.
6. Confirm so that the value on the frequency counter is between
5,300 and 6,300 Hz.
7. Confirm frequency difference the beginning and the end of
the tape should be within 1%.
Adjustment Location: MAIN board (See page 11)
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SECTION 5
2 9 9 4 2 8
0 dB=0.775 V
SP Out
6 Ω
0.775 V (0 dB)
Signal
3 kHz, 0 dB Tape speed adjustment
DECK-A
1 5 0 5 8 2 9 9 4
32 Ω
set
PHONES jack (J301)
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9 9
Phones
32 Ω
0.25 V (–10 dB)
Used for
DECK-B
2 8 9 9
frequency
counter
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