HCD-EC50 - Sony Audio Service Manual (repair manual). Page 12

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12
HCD-EC50
RECORD/PLAYBACK  HEAD  AZIMUTH  ADJUSTMENT
Procedure:
1. Mode:  Playback
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
3. Mode:  Playback
4. After the adjustments, apply suitable locking compound to
the pats adjusted.
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position 
R-CH
peak
0 dB=0.775 V
DECK SECTION
set
JACK board
PHONES jack
(J102)
+
level meter 
test tape
P-4-A063
(6.3 kHz, 
10 dB)
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
Test Tape
Tape
Signal
Used for
P-4-A063
6.3 kHz, -10 dB
Azimuth Adjustment
set
test tape
P-4-A063
(6.3 kHz, 
10 dB)
oscilloscope
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
JACK board
PHONES jack
(J102)
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
demagnetizer. (Do not bring the head magnetizer close to the
erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, appiy suitable locking compound to
the parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
Tape Tension  Measurement
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 80 g
(more than 2.82 oz)
2.0 – 8.0 mN • m
(20 to 80 g • cm)
(0.28 – 1.12 oz • inch)
0.15 – 0.6 mN • m
(1.5 to 6 g • cm)
(0.021 – 0.083 oz • inch)
5 – 17.7 mN • m
(50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
5 – 17.7 mN • m
(50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
CQ-102AS
CQ-102C
CQ-201AS
CQ-201B
Mode
FWD
FWD
back tension
FF
REW
Torque meter
Meter reading
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS
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