Tape Eck Adjustment - Sanyo DC-DA1400M Service Manual

TAPE DECK ADJUSTMENTS
1. HEAD REPLACEMENT
After replacement, demagnetize. The heads by using a degausser.
Be sure to clean the heads before attempting to make any adjustments.
All wiring should be returned to the original position after work is completed.
2. HEAD AZIMUTH ADJUSTMENT
(1) Load the test tape(STT-113CN,etc., 8KHz) for azimuth
adjustment.
(2) Press the PLAY button.
(3) Use a cross-tip screwdriver to turn the screw for azimuth
adjustment so that left and right output are maximized
(4) Press the STOP button.
(5) After completion of the adjustment, use thread lock (TB-1401B)
to secure the azimuth-adjustment screw.
3. MOTOR REPLACEMENT
4. AC BIAS FREQUENCY ADJUSTMENTS
(1) connect counter to T801(BS);
(2) R/P swith in recording state;
(3) Adjusting T801 use a plastic screw, AC bias frequency: 82KHz.
5. MOTOR SPEED ADJUSTMENT
(1) Insert the test tape(MTT-111N,etc., 3,000 Hz)
(2) Press the PLAY button.
(3) Use a flat-tip screwdriver to turn the SVR(located inside the
rear of the motor) to adjust SVR so that the frequency counter
become 3,000 Hz .
6. CHECKING THE MECHANISM TORQUSE AND TENSION
Measurement
Cassette of
measurement
PLAY
F.FWD
REW
Take-up torqe
PLAY:TW-2111A
F.FWD/REW:TW-2231
30-70 gf.cm
55 gf or more
55 gf or more
- 3 -
Back tension
PLAY:TW-2111A
1.5 - 5 gf.cm
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This is a basic tape deck adjustment.
Tape tension
Drive-power cassette
TW-2412
70 gf or more
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