Panasonic SA-PM65MD Service Manual page 34

- The magnetic head is a precision unit and is very fragile. Do
not deform it.
- Laser diode in the optical pickup may be destroyed by the
staticelectricity generated in your clothes or body. Be
especially careful with the static electricity.
- The optical pickup is structured extremely precisely. Do not
subject to the strong impact or shock. Do not touch the lens.
2. About handling the magnetic head
When replacing the magnetic head, do not tighten the mounting
screw (RHD17022) too firmly. If the screw is tightened too much to
deform the resin, the position of the head is moved, and this
affects its recording operation.
Recommended torque for mounting screw: 700 g cm +/- 100 g cm
Reference: This is the same force as using a screwdriver with a 15-
mm diameter grip, you fasten the screw naturally with your thumb
and index finger.
3. About the driver for adjusting laser power
Use only insulated driver such as a ceramic driver. With the metal
driver, it is not possible to adjust properly because of the
induction noise. Also, if it short-circuits with the chassis, it may
destroy or damage the laser diode.
Recommended driver: VESSEL 9000 1.8 -30 (Ceramic driver)
Cautions on optical pickup:
- The optical pickup and the magnetic head are structured precisely;
therefore, they are very fragile. Be careful not to touch them with
the edge of the laser power meter.
- The sensor of the laser power meter is a very fine part. Be careful
not to touch it to the optical pickup lens.
- The focus point of the laser reaches to 356°F. Therefore, avoid
adjusting using laser power for a long time because the sensor of
the laser power meter may be burned.
- Do not allow the write power to even momentarily reach or exceed
7.5 mW. Doing so will result in damage to the optical pickup.
- Do not set the unit to the laser power adjustment mode with the
MD loaded. Doing so may result in damage to the MD.
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