Sony HCD-NEZ30 Service Manual - Page 14

Hcd-nez30, Electrical, Adjustments

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HCD-NEZ30 SECTION 6 ELECTRICAL ADJUSTMENTS DECK SECTION 0 dB=0.775 V 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 Signal 6.3 kHz, -10 dB Used for Azimuth Adjustment RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT Note: Remove the cassette lid assy before this adjustment. 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 within 1dB Output level Screw position R-CH peak L-CH R-CH peak peak within 1dB Screw position 3. Mode: Playback test tape HEAD PHONE board P-4-A063 (6.3 kHz, -10 dB) PHONES jack (J500) oscilloscope VH set Procedure: 1. Mode: Playback test tape P-4-A063 (6.3 kHz, -10 dB) HEAD PHONE board PHONES jack (J500) level meter set + - waveform of oscilloscope in phase 45° 90° 135° 180° good wrong 4. After the adjustments, apply suitable locking compound to the pats adjusted. Adjustment Location: Record/Playback/Erase Head 14

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14
HCD-NEZ30
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.
Adjustment Location:
Record/Playback/Erase Head
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
RECORD/PLAYBACK
HEAD
AZIMUTH
ADJUSTMENT
Note:
Remove the cassette lid assy before this adjustment.
Procedure:
1.
Mode:
Playback
0 dB=0.775 V
DECK
SECTION
set
HEAD PHONE board
PHONES jack
(J500)
+
–
level meter
test tape
P-4-A063
(6.3 kHz, –10 dB)
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
HEAD PHONE board
PHONES jack
(J500)
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
SECTION
6
ELECTRICAL
ADJUSTMENTS