Tape Deck Adjustments - Sharp QT-MP5W Service Manual

[2] Tape Deck Adjustments

1. HEAD REPLACEMNET
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., 8 KHz) 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 azimuth-adjustment screw.
3. MOTOR REPLACEMENT
4. AC BIAS FREQUENCY ADJUSTMENTS
(1) Connect counter to T801 (BS).
(2) R/P switch in recording state.
(3) Adjusting T801 use a plastic screw, AC bias frequency: 80 KHz.
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 Torque
PLAY: TW-2111A
F.FWD/REW: TW-2231
30 - 70 gf.cm
55 gf or more
55 gf or more
2 – 2
Back Tension
PLAY: TW-2111A
1.5 - 5 gf.cm
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QT-MP5W
Tape Tension
Drive-power cassette
TW-2412
70 gf or more
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