Read Sony CFD-575 / CFD-577 Service Manual online
– 8 –
Tape Speed Adjustment
Procedure :
Mode : Playback
Adjustment Value :
Speed checker
Digital frequency counter
± 0.66%
2,980 – 3,020Hz
Frequency difference between the beginning and the end of the tape
should be within 1% (30Hz).
should be within 1% (30Hz).
Adjustment Location : MAIN board
Torque
Torque Meter
Meter Reading
Forward
CQ-102C
22.5 – 50 g•cm
(0.32 – 0.76 oz•inch)
Forward
CQ-102C
2 – 5 g•cm
Back Tension
(0.03 – 0.06 oz•inch)
Fast Forward
CQ-201B
60 – 120 g•cm
(0.84 – 1.67 oz•inch)
Rewind
CQ-201B
60 – 120 g•cm
(0.84 – 1.67 oz•inch)
SECTION 4
ADJUSTMENTS
4-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
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 the adjustments.
4. After the adjustments, apply suitable locking compound to the
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Torque Measurement
Tape Tension Measurement
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 150g
(more than 5.30 oz)
set
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
32
Ω
speed checker
LFM-30 or
digital frequency
counter
LFM-30 or
digital frequency
counter
J302 (phones)
– +
RV300
Record/Playback Head Azimuth Adjustment
DECK A
DECK B
Procedure :
Mode : Playback
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 1dB.
of output levels match together within 1dB.
test tape
P-4-A063
(6.3kHz, –10dB)
P-4-A063
(6.3kHz, –10dB)
set
32
Ω
J302 (phones)
level meter
+
–
L-CH
peak
peak
R-CH
peak
peak
L-CH
peak
peak
R-CH
peak
peak
Screw
position
position
output
level
level
within
1 dB
1 dB
within
1 dB
1 dB
screw
angle
angle
4-2. ELECTRICAL ADJUSTMENTS
TAPE SECTION
1. The adjustments should be performed in the order given in the
service manual . (As a general rule playback circuit adjustment
should be completed befor performing recording circuit adjust-
ment.)
should be completed befor performing recording circuit adjust-
ment.)
2. The adjustments should be performed for both L-CH and R-CH
unless otherwise indicated.
• Switch location
FUNCTION
: TAPE
ROTARY EQUALIZER : center click
VOLUME
VOLUME
: MAX
MEGA BASS
: mechanical center
Standard Output Level
Output terminal
PHONES
SP OUT
load impedance
32
Ω
3.2
Ω
output signal level
0.25V (–10dB)
0.775V (0dB)
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
P-4-A063
6.3kHz, –10dB
Azimuth Adjustment
0dB=0.775V
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