Read Sony DXA-WZ88D / MHC-WZ88D Service Manual online
11
DXA-WZ88D
SECTION 3
ELECTRICAL ADJUSTMENTS
[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 1 dB of peak.
so that outputs match within 1 dB of peak.
set
SPEAKER terminals (TM401)
L-CH, R-CH
L-CH, R-CH
+
–
–
level meter
test tape
P-4-A63J
(10 kHz, –10 dB)
P-4-A63J
(10 kHz, –10 dB)
Screw
position
position
L-CH
peak
peak
within
1 dB
1 dB
Output
level
level
L-CH
peak
peak
R-CH
peak
peak
within
1 dB
1 dB
Screw
position
position
R-CH
peak
peak
DECK SECTION 0 dB=0.775V
Note:
Confirm each contents of this section first of all. If the results are
not satisfied, do the adjustment.
not satisfied, do the adjustment.
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to
3. After the adjustments, apply suitable locking compound to
the parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual.
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
Signal
Used for
Tape
P-4-A63J
10 kHz, –10 dB
4. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to
5. After the adjustments, apply suitable locking compound to
the pats adjusted.
Adjustment Location: Record/Playback/Erase Head
3. Mode: Playback
set
test tape
P-4-A63J
(10 kHz, –10 dB)
P-4-A63J
(10 kHz, –10 dB)
R-CH
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
SPEAKER terminals (TM401)
L-CH
L-CH
Azimuth Adjustment
adjustment screws
Note: Refer to 2-8. TC Holder (A), TC Holder (B),
Lid (TC) Assy (see page 10)
Lid (TC) Assy (see page 10)
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