Mechanical Adjustments; Electrical Adjustments; Tape Deck Section - Sony CFD-CD777SMK2 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
pinch roller
rubber belts
idlers
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.
6. Power supply voltage: 12V dc.
Torque Measurement
Mode
Playback CQ-102C
Back tension CQ-102C
Rewind
CQ-201B
Fast foward
Tape Tension Measurement
Tension Meter
TE
L 13942296513
CQ-403A
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SECTION 4
PRECAUTION
playback head
erase head
capstan
DECK-A
Torque Meter Meter Reading
30 – 60 g•cm
(0.42 – 0.83 oz•inch)
1.8 – 7 g•cm
(0.025 – 0.097 oz•inch)
55 – 120 g•cm
(0.77 – 1.66 oz•inch)
DECK-A
Meter Reading
more than 60 g (2.12 oz)
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ELECTRICAL ADJUSTMENTS

8

TAPE DECK SECTION

1. The adjustments should be perfomed 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 CD/RADIO OFF
MEGA BASS control ..............................................minimum
VOLUME control ................................................... maximum
BALANCE control .................................... mechanical center
Standard Output Level
Load impedance
DECK-B
Output level
Test Tape
Type
WS-48B
P-4-A063
Record/Playback Head Azimuth Adjustment
DECK-B
Procedure:
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1. Mode: FWD/REV playback (DECK A)
3 6 7 1 3
FWD playback (DECK B)
test tape
P-4-A063
(6.3 kHz, –10 dB)
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both
of output levels match together within 1 dB.
L-CH
peak
Screw
position
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CFD-CD777SMK2
SECTION 5
2 9 9 4 2 8
0 dB=0.775 V
SP Out
4 Ω
0.775 V (0 dB)
Signal
3 kHz, 0 dB Tape speed adjustment
6.3 kHz, –10 dB Head azimuth adjustment
1 5 0 5 8 2 9 9 4
level meter
32 Ω
set
PHONES jack (J301)
within
1 dB
output
level
R-CH
peak
L-CH R-CH
peak peak
m
co
9 9
Phones
32 Ω
0.25 V (–10 dB)
Used for
DECK-A
DECK-B
2 8 9 9
+
–
within
1 dB
Screw
angle
11