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– 12 –
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 1dB.
Screw
position
L-CH
peak
within
1dB
output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
angle
R-CH
peak
3. Mode : Forward Playback
4. Change the reverse playback mode and repeat the steps 1 to 3.
5. After the adjustment, lock the adjustment screw with suitable
locking compound.
Adjustment Location :
–record/playback head (Deck A and B)
Deck A
Deck B
forward
reverse
Adjustment Screw
Tape Speed Adjustment
Procedure :
•
Perform high speed adjustment before normal speed adjustment.
Mode : Playback
DECK A
DECK B
Speed
Deck
Adjustment
Frequency counter
*High
A
RV652
5,940 to 6,060 Hz
B
RV652
Normal
A
RV651
2,990 to 3,030 Hz
B
RV651
* Continuous to press HIGH SPEED DUBBING switch (S507) in
playback mode : High speed playback.
Frequency difference between the beginning and the end of the tape
should be within ± 3%.
Frequency difference between deck A and deck B the beginning of
the tape should be within 1.5%.
Adjustment Location : AUDIO board (see page 13)
Playback Level Adjustment
Procedure :
Mode : Playback
DECK A
DECK B
Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301 (L-
CH) and RV401 (R-CH) so that adjustment within adjustment level
as follows.
Adjustment Level :
OUTPUT level : –3.5 ± 0.5 dB (0.489 to 0.546 V)
Level Difference between Channels : within 0.5 dB
Confirm the OUTPUT level dose not change in playback mode while
changing the mode from playback to stop several times.
Adjustment Location : AUDIO board (see page 13)
set
+
–
test tape
P-4-A100
(10kHz, -10dB)
MD OUT
Oscilloscope
L-CH
R-CH
V
H
+
–
screen pattern
in phase
45
°
90
°
135
°
180
°
good
wrong
set
test tape
WS-48B
(3 kHz, 0 dB)
MD OUT
+
–
frequency counter
set
+
–
test tape
P-4-L300
(315 Hz, 0 dB)
MD OUT
level meter
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