Laser Beam Safety Precaution; Cd Pick-Up Maintenance; Tape Adjustments - Sanyo DC-DA1000 Service Manual

LASER BEAM SAFETY PRECAUTION

• Pick-up that emits a laser beam is used in this CD player section.
CAUTION :
THIS PRODUCT CONTAINS A LOW
POWER LASER DEVICE,TO ENSURE
CONTINUED SAFETY DO NOT REMOVE
ANY COVERS OR ATTEMPT TO GAIN
ACCESS TO THE INSIDE OF THE
PRODUCT.REFER ALL SERVICING TO
QUALIFIED PERSONNEL.
LASER OUTPUT .............. 0.6 mW Max. (CW)
WAVELENGTH .................. 790 nm

CD PICK-UP MAINTENANCE

About pick-up (Optical lens) Cleaning
Clean a lens with swab of the cotton which moistened it with alcohol, cleaning paper or cleaning disc appointed.
Specified cleaning disc : LC-1 (Part code : 645 026 1961 ..... manufactured by SANYO.)
Show a clean procedure in the following in reference by swab of cotton.
1. Cotton swab is wrapped with Cleaning paper.
2. Add the isopropyl alcohol.
3. Gently move the tip of cotton swab just like a draw a whirlpool from inside to outside on the surface of lens.

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.
R / P HEAD
RED WHITE
YELLOW EARTH
e. Checking the mechanism torques
- 1 -
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.
d. Replacing the motor
MOTOR SPEED
ADJUSTMENT
1
• Clean the head, capstan and pinch roller before making
any measurement.
Measurement Take-up torque
Cassette for PLAY : TW-2111A
measurement F.FWD/REW : TW-2231
PLAY 30 ~ 70gr.cm
F.FWD/REW 55 gr or more
3
2
4
4
Back tension Tape tension
PLAY : TW-2111A Drive-power cassette
TW-2412
1.0 ~ 6.0gr.cm 80 gr or more
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