Tape Deck Adjustments - Sanyo MCH-900F Service Manual

iii
. .
TAPE DECK ADJUSTMENTS
a.
(a)
(b)
(1)
(2)
(3)
(4)
(5)
b.
(a)
I
(b)
HEAD REPLACEMENT AND HEAD AZIMUTH ADJUSTMENT
HEAD REPLACEMENT
4
After replacement, demagnetize the heads
by using a degausser.
Be sure to clean the heads before attempting to make any adjustments.
21P HEAD
Ml wiring should be returned to the original position after work is completed.
LOW
HEAD
AZIMUTH ADJUSTMENT
Load the test tape ( VIT-703, etc., 10 kHz ) for azimuth
adjustment.
Press the PLAY button.
Use a cross-tip screwdriver to turn the screw for azimuth
adjustment so that the left and right output are maximized.
Press the the STOP button.
After completion of the adjustment, use thread lock (TB-1401 B)
to secure the azimuth-adjustment screw.
MOTOR REPLACEMENT AND SPEED ADJUSTMENT
MOTOR REPLACEMENT
MOTOR SPEED ADJUSTMENT
(1) Insert the test tape (
MTT-lllN, etc., 3000 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
becomes 3,000 Hz.
c.
CHECKING THE MECHANISM TORQUES AND TENSION
WHiTE
HEAD AZIMUTH ADJ.
MOTOR
SPEED
. Clean the head, capstan and pinch roller before making any measurement.
Measurement
Take-up torque
Back tension Tape
tension
Cassette
for
PLAY:TW-211 1A Orive-power cassette
PLAY: TW-21 11A
measurement
F.FWD/REW:TW-2231 TW-2412
PLAY
30-60 gr.cm
2.0- 4.5 gr.cm 60 gr or more
F.FWD 55-120 gr.cm
REW 55-120 gr.cm
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