Sanyo MCD-Z250F, Service Manual

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TAPE ADJUSTMENTS
a. Adjusting Azimuth
Be sure to clean the heads before attempting to make any adjustment.
Be sure both channel’s waveform are the same for the phase matching.
Be sure both channels (1 and 2) are the same level using a dual-channel oscilloscope.
After completion of the adjustment, apply the threadlock (TB-1401 B) to the azimuth adjustment screws to fix them securely.
(3)
(4)
Load an azimuth adjustment test tape (VT-T-703 etc., 10
in tape deck.
Press the PLAY button.
Use a cross-tip screwdriver to turn the screw for azimuth
adjustment so that the left and right outputs are maximized.
Press the STOP button.
b. Replacing the Head
HEAD
l
After replacing the head, demagnetize the head by using a
degausser.
RIP
HEAD
l
All wiring should be returned to the original position after work is
completed.
c. Replacing the Motor
0
d. Adjusting Tape Speed
l
Use a plastic screwdriver for adjustment.
(1) Inset the test tape 11 N etc., 3000 Hz).
(2) Press the PLAY button.
(3) Use a flat-tip screwdriierto turn the SVR to adjust so that the frequency
counter becomes 3000 Hz.
e. Checking the Mechanism Torques
Clean the head, capstan and pinch roller before making any measurement.
Measurement
Cassette for
measurement
PLAY
Take-up torque
PLAY TW-2111 A
I REW
30-60
55-l 20 gr.cm
gr.cm
Back tension Tape tension
PLAY:TW-2111A
Drive-power cassette
TW-2412
1.5-4.5 gr.cm 60 gr or more