Sony TC-WR445 - Playback Level Adjustment; Tape Speed Adjustment

3. Playback Mode
test tape
P-4-A100
10kHz, — 10dB, ,
( cs ) oscilloscope
L-CH
LINE OUT
Screen pattern
OOOO
(7 phase. 45° 90° 135° 180°,
good wrong
4, Change the reveres playback mode and repeat the steps 1 to 3.
5. After the adjustment, lock the adjustment screws with suitable
locking compound.
Adjustment Location : — record/playback head —
reverse side
forward side
adjustment screws
Tape Speed Adjustment
Procedure :
— Forward Playback Mode —
test tape
WS-48B
(3kHz, OdB)
LINE OUT
(high speed adjustment)
1. Connect @ pin of IC801 to ground.
2. Set to FWD playback mode.
3. Keep on pressing the SYNCRO DUBBING switch.
4. Adjust RV652 so that the frequency counter reading becomes
6,000 + 20Hz.
(normal speed adjustment)
1. Set to FWD playback mode.
2. Adjust RV651 so that the frequency counter reeding becomes
3,000 + 10Hz.
Frequency difference between the beginning and the end of the tape
should be within 3%.
Frequency difference between the deck-A and deck-B the beginning
of the tape should be within 1.5%.
Adjustment Location : AUDIO board
Playback Level Adjustment
Procedure :
— Forward Playback Mode —
test tape
P-4-L300
(315Hz, 0dB)
le
LINE OUT
Adjust deck-A is RV311(L-CH) and RV411(R-CH), deck-B is
RV301(L-CH) and RV401(R-CH) so the VTVM reading becomes
the adjustment limits below.
Adjustment Value :
LINE OUT level : — 7.7 = 0.5dB (0.301 to 0.338V)
Level difference between channels : within 0.5dB
Confirm the LINE OUT level does not change in playback mode
while changing the mode from playback to stop several times.
Adjustment Location : AUDIO board