Tape Deck Adjustments - Sanyo DC-DA150 Service Manual

TAPE ADJUSTMENTS
a. Replacing the head
1. After replacement, demagnetize the heads by using a
degausser.
2. Be sure to clean the heads before attempting to make any
adjustments.
3. Be sure both channels (1 and 2) are the same level.
(Using a dual-channels oscilloscope).
4. All wiring should be returned to the original position after
work is completed.
b. Adjusting head azimuth
1. Load a test tape (VTT-738, etc. :10kHz) for azimuth
adjustment.
2. Press the PLAY button.
3. Use a cross-tip screwdriver to turn the screw for normal
azimuth adjustment so that the left and right outputs are
maximized at the same phase during normal playback.
4. Press the STOP button.
c. Adjusting motor speed
1. Insert the test tape (MTT-111 or etc. 3,000 Hz).
2. Press the PLAY button.
3. Use a flat-tip screwdriver to turn the SVR to adjust so that
the frequency counter becomes 3,000 Hz.
4. Press the STOP button.
e. Checking the mechanism torques
• Clean the head, capstan and pinch roller before making any measurement.
Measureent
Cassette for
measurement
F.FWD/REW
Take-up torque
PLAY : TW-2111A
F.FWD/REW : TW-2231
PLAY 30 ~ 70gr.cm
55 gr or more
d. Replacing the motor
MOTOR SPEED
ADJUSTMENT
1
4
Back tension
PLAY : TW-2111A
1.0 ~ 6.0gr.cm
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- 3 -
R / P HEAD
RED WHITE
YELLOW EARTH
3
2
4
Tape tension
Drive-power cassette
TW-2412
80 gr or more
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