Mechanical Adjustments; Electrical Adjustments - Sony HCD-GZR5D Service Manual

SECTION 5

MECHANICAL ADJUSTMENTS

• Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads
erase head
capstan
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, 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 Torque meter
FWD CQ-102AS
FWD
CQ-102C
back tension
FF CQ-201AS
REW CQ-201B
• Tape Tension Measurement
Mode Torque meter
FWD CQ-403A
pinch rollers
rubber belts
idlers
Meter reading
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)
Meter reading
more than 80 g
(more than 2.82 oz)
SECTION 6

ELECTRICAL ADJUSTMENTS

DECK SECTION
0 dB = 0.775V
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
• Test Tape
Tape Signal
P-4-A063 6.3 kHz, – 10 dB
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Procedure:
1. Mode: Playback
test tape
P-4-A063
(6.3 kHz, -10 dB)
set
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.
within
L-CH
1dB
peak
Output
level
R-CH
peak
Screw
position
L-CH
peak
3. Mode: Playback
test tape
JACK board
P-4-A063
PHONES jack
(6.3 kHz, -10 dB)
(J252)
set
waveform of oscilloscope
in phase 45
good
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
HCD-GZR5D
Used for
Azimuth Adjustment
JACK board
PHONES jack
(J252)
level meter
+
–
within
1dB
Screw
position
R-CH
peak
oscilloscope
V H
90 135 180
wrong
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