Electrical Adjustments - Sony HCD-NEZ3 Service Manual

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3.

ELECTRICAL ADJUSTMENTS

DECK SECTION
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
• Test Tape
Tape
P-4-A063 6.3 kHz, -10 dB
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Note: Remove the cover (azimuth) before this adjustment.
TE
L 13942296513
Procedure:
1. Mode: Playback
test tape
P-4-A063
(6.3 kHz, –10 dB)
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0 dB=0.775 V
Signal Used for
Azimuth Adjustment
HEAD PHONE board
PHONES jack
(J500)
level meter
set +
–
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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.
L-CH
peak
Output
level
R-CH
peak
Screw
position
3. Mode: Playback
test tape
P-4-A063
(6.3 kHz, –10 dB)
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4. After the adjustments, apply suitable locking compound to
the pats adjusted.
Adjustment Location: Record/Playback/Erase Head
co
.
HCD-NEZ3/NEZ5
9 4 2 8
within
1dB
L-CH R-CH
peak
peak
HEAD PHONE board
PHONES jack
oscilloscope
(J500)
V
set
waveform of oscilloscope
0 5 8 2 9 9 4 2 8
in phase 45 ° 90 ° 135 ° 180 °
good wrong
m
9 9
within
1dB
Screw
position
H
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