– 27 –
32
Ω
test tape
WS-48B
(3 kHz, 0dB)
set
PHONES jack
speed checker
LFM-30 or
digital frequency
counter
Tape Speed Adjustment
Procedure:
Mode: playback
3. Phase Check
Mode: playback
+
–
V
H
+
–
Screen pattern
Good Wrong
in phase 45
°
90
°
135
°
180
°
PHONES jack
set
R-CH
L-CH
32
Ω
32
Ω
oscilloscope
test tape
P-4-A063
(6.3 kHz, –10 dB)
4. After the adjustment, lock the screws with locking compound.
Adjustment Location:
Frequency difference between the beginning and the end of the
tape should be within 1% (30 Hz).
Adjustment Location:
Speed checker Digital frequency counter
–1% to +1% 2,970 to 3,030 Hz
Adjustment Values:
M691
adjustable
resistor
forward
reverse
screwdriver
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