Sony CFD-W57L Service Manual ▷ View online
– 13 –
2-9. HOLDER (MG) ASSY
2-10. DISC TABLE
1
BVTP 3x8
2
Push the two claws in the
arrowed direction and lift
the holder (MG) assy.
the holder (MG) assy.
3
Push the two claws in the
arrowed direction and lift
the holder (MG) assy.
the holder (MG) assy.
holder (MG) assy
2
shaft (table guide)
3
disc table
1
KTP 2.6x6
– 14 –
2-11. PULLEY (S)
2-12. HOLDER (BU) ASSY
3
belt
4
pulley (S)
2
gear (C)
1
gear (P)
3
cam
4
holder (BU) assy
2
yoke bracket
1
connector
– 15 –
PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
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 the 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
supply voltage unless otherwise noted.
6. Power supply voltage: 12 V dc.
Torque Measurement DECK A DECK B
Mode
Torque meter
Meter reading
Forward
CQ-102C
22.5 to 55 g • cm
(0.31 to 0.76 oz • inch)
Forward
CQ-102C
2 to 5 g • cm
back tension
(0.03 to 0.07 oz • inch)
Fast Forward
60 to 120 g • cm
and
CQ-201B
(0.83 to 1.67 oz • inch)
Rewind
Tape Tension Measurement DECK A DECK B
Mode
Tension meter
Meter reading
Forward
CQ-403A
more than 150 g
(more than 5.29 oz)
SECTION 4
ELECTRICAL ADJUSTMENTS
SECTION 3
MECHANICAL ADJUSTMENTS
TAPE SECTION 0 dB = 0.775 V
Standard Input Level
Input terminal
MIX MIC
source impedance
300
Ω
input signal level
3.085 mV (–48 dB)
Standard Output Level
Output terminal
SP OUT
PHONES OUT
load impedance
6
Ω
32
Ω
output signal level
0.775 V (0 dB)
0.25 V (–10 dB)
Test Tape
Tape
Signal
Used for
WS-48A
3 kHz, 0 dB
tape speed adjustment
P-4-A063
6.3 kHz, –10 dB
head azimuth adjustment
Tape Speed Adjustment DECK A
Procedure:
• Perform normal speed adjustment before high speed check.
Mode: playback (deck A)
• Perform normal speed adjustment before high speed check.
Mode: playback (deck A)
record (deck B)
Deck
Tape
Adjustment
Frequency
speed
point
counter
A
Normal (playback)
RV301
2,970 to 3,000 Hz
A
HI-SPEED DUBBING
(confirmation) 5,500 to 5,900 Hz
(playback)
B
HI-SPEED DUBBING
———
———
(record)
Frequency difference between the beginning and the end of the
tape should be within
tape should be within
±
1.5% (both Normal and Hi-speed).
Adjustment Location:
–set rear view–
0000
phones jack
digital frequency
counter
counter
set
32
Ω
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
RV301
TAPE
SPEED
ADJ
– 16 –
R-CH
peak
peak
R-CH
peak
peak
L-CH
peak
peak
L-CH
peak
peak
screw
position
position
Output
level
level
within
3 dB
3 dB
within
3 dB
3 dB
angle
REC/PB Head Azimuth Adjustment DECK A DECK B
Procedure:
1. Mode: playback
1. Mode: playback
3. Phase Check
Mode: playback
Note:
Finish the screw adjustment with a turn in the clockwise
direction.
After the adjustment, lock the adjustment screw.
direction.
After the adjustment, lock the adjustment screw.
Adjustment Location: playback head (deck A)
record/playback head (deck B)
phones jack
set
32
Ω
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
level meter
phones jack
set
L-CH
32
32
Ω
32
Ω
R-CH
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
osilloscope
R-CH
L-CH
V
H
Screen pattern
in phase
45˚
90˚
135˚
180˚
good
wrong
adjustment
screw
screw
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 3 dB.
of output levels match together within 3 dB.
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