Sony PHC-Z10 Service Manual page 12

3. Phase Check
Mode: playback
test tape
P-4-A063
(6.3 kHz, –10 dB)
L-CH
32 Ω
L-CH
set
R-CH
32 Ω
R-CH
J901 (phones)
Screen pattern
in phase 45˚
good
Note: Finish the screw adjustment with a turn in the clockwise
direction.
After the adjustment, lock the adjustment screw.
Adjustment Location: playback head (deck A)
record/playback head (deck B)
adjustment screw
12
osilloscope
V H
90˚ 135˚ 180˚
wrong
Tape Speed Adjustment DECK A
Procedure:
Mode: Playback
test tape
WS-48B
(3 kHz, 0 dB)
set
J901 (phones)
Adjustment Value: normal tape speed
Adjust the tape speed adjustment control inside motor, so that the
frequency counter reading becomes 3,000 Hz.
Specification Value:
Digital frequency counter
2,910 – 3,090Hz
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45 Hz).
Adjustment Location:
CASSETTE DECK
Tape speed adjustment
control inside motor
Sample Value of Wow and flutter
W.RMS (JIS) less then 0.3%
(test tape: WS-48B)
DECK B
digital frequency
counter
0000
32 Ω