— 5 —
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 1dB of peak.
3.
Mode: Playback (FWD)
4.
Repeat steps 1 to 3 in playback (REV) mode.
5.
After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location:
Record/Playback Head (Deck A and B)
and main board.
reverse
forward
Tape Speed Adjustment
DECK A
Note: Start the Tape Speed adjustment as below after setting to the
test mode.
Procedure:
Mode: Playback (FWD)
1.
Insert the WS-48B into the deck A and the blank tape into the
deck B.
2.
Press the REC button and
·
button on the deck B. Then
the deck B is at recording mode.
3.
Set the deck A to playback mode.
4.
Press the DUBBING SPEED HIGH button in playback mode.
Then at HIGH speed mode.
5.
Adjust RV652 on the AUDIO board do that frequency counter
reads 6,000 ± 90 Hz.
6.
Press the DUBBING SPEED NORMAL button in playback
mode.
Then at NORMAL speed mode.
7.
Adjust RV651 on the AUDIO board so that frequency counter
reads 3,000 ± 90Hz.
8.
Frequency difference between deck A and deck B the beginning
of the tape should be within ± 1.5 %.
Adjustment Location: AUDIO board
Sample Value of Wow and flutter
W.RMS (JIS) within 0.3%
(test tape: WS-48B)
Playback level Adjustment
DECK A
DECK B
Procedure:
Mode: Playback (FWD)
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:
VIDEO1 AUDIO OUT PB level: 301.5 to 338.3 mV (–8.2 to
–7.2 dB) level difference between the channels: within ± 0.5
dB
Adjustment Location: AUDIO and main boards
Screw
position
L-CH
peak
within
1dB
output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
set
test tape
P-4-A100
(10kHz, –10dB)
oscilloscope
L
R
V
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
rear panel
VIDEO1
AUDIO OUT connector
H
+
–
set
test tape
WS-48B
(3 kHz, 0 dB)
frequency counter
rear panel
VIDEO1
AUDIO OUT connector
(L: L-CH)
(R: R-CH)
+
–
level meter
set
test tape
P-4-L300
(315 Hz, 0 dB)
rear panel
VIDEO1
AUDIO OUT connector
(L: L-CH)
(R: R-CH)
