Sony CFD-980 Service Manual page 16

QQ
3 7 63 1515 0
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode : Playback
test tape
P-4-A063
(6.3kHz, –10dB)
set
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both
of output levels match together within 2dB.
L-CH
peak
within
output
2dB
level
R-CH
peak
Screw
position
TE
L 13942296513
L-CH
peak
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.
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level meter
32k Ω
+
–
J302 (phones)
within
2dB
screw position
R-CH
peak
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8
3. Phase Check
Mode : Playback
test tape
P-4-A063
(6.3kHz, –10dB)
L-CH
set
R-CH
screen pattern
45 ° 90 °
in phase
good
Note: Adjustment must be completed by cw turning of adjustment
screw.
After the adjustment, lock the screws with locking
compound.
Adjustment Location : Record/Playback head
Q Q
3 6 7 1 3 1 5
co
.
9 4 2 8
oscilloscope
L-CH
32 Ω
V H
32 Ω
R-CH
J302 (phones)
135 ° 180 °
wrong
0 5 8 2 9 9 4 2 8
m
9 9
9 9