Sony TC-RX370 - Phase and Playback Level Checks; Tape Speed Adjustment and Verification

3. Phase check
Playback Mode
test tape
P-4-A100
(10kHz, —10dB) oscilloscope
L-CH 47kQ
eu LINE OUT
Screen pattern
in phase 45° 90° 135° 180°
EEEEEEREENSSSSEEREEIIED ammnemeneeeeeeeeed oY
good wrong
4, Change the reverse playback mode and repeat the steps
1 to 3, (TC-RX370)
5. After the adjustment, lock the adjustment screw with
suitable locking compound.
Adjustment Location : — record/playback/erase head —
TC-K370
FWD(Adjustment screw)
TC-RX370
Adjustment screw
Tape Speed Adjustment
Procedure:
—Forward Playback Mode—
test tape
WS-48B
(3kHz, OdB) frequency counter
LINE OUT
Perform high speed adjustment before normal speed adjust-
ment.
(high speed adjustment)
1. Set to FWD playback mode.
2. Keep on pressing the HIGH SPEED DUBBING switch.
3. Adjust RV72 so that the frequency counter reading
becomes 6,000+30Hz.
(normal speed adjustment)
1. Set to FWD playback mode.
2. Adjust RV71 so that the frequency counter reading
becomes 3,000+10Hz.
Frequency difference between the beginning and the end of
the tape should be within 3%.
Adjustment Location: AUDIO board
Playback Level Adjustment
Procedure :
—Forward Playback Mode—
test, tape
P-4-L300
(315Hz, OdB)
LINE OUT
Adjust RV11 (L-CH) and RV21 (R-CH) so the VITVM
reading becomes the adjustment limits below.
Adjustment Value :
LINE OUT level: —5+0.5dB (0.412 to 0.461V)
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