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especially careful not to look laser beam directly or to touch the
laser beam when adjusting the unit and checking its operation.
18.1. Laser Power Adjustment
Adjust each laser power: read power for reading (play) and write power for writing (record).
18.1.1. Necessary Instruments
- Laser power meter (LE8010)
- Test disc (Pre-mastered disc RFKV0006 or RFKV0014)
- Recordable disc available on sales route (with music recorded)
- Insulated driver for adjustment such as a ceramic driver
18.1.2. Set the Unit to the Adjustment Mode
Perform the (Step 1) and (Step 2) in the item 7.2.
Checks and Component Replacement Procedures.
Caution:
1. About handling the MD unit
- The magnetic head is precision unit and is very fragile. Do not
deform it.
- Laser diode in the optical pickup may be destroyed by the
static electricity 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±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 induction
noise. Also, if it short-circuits with the chassis, it may destroy or
Checking for the MD servo P.C.B.
34
in Operation
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