Panasonic SA-PM30MD Service Manual page 23

10.3. Alignment Points
<Cassette Deck>
Fig. 8
10.4. Laser Power Adjustment
Adjust each laser power : read power for reading (play) and
write power for writing (record).
10.4.1. Necessary Instruments
• Laser power meter (Advantest TQ8210 or compatible
meter)
• Test disc (Pre-mastered disc RFKV0006 or RFKV0014)
• Recordable disc available on sales root (with music
recorded)
• Insulated driver for adjustment such as a ceramic driver
• Jitter meter
10.4.2. Set the Unit to the Adjustment
Mode
1. Perform the item "8.1.6. Checking for the MD Servo P.C.B."
in "Operation Check and Main Component Replacement
Procedures", Step 1 to Step 4.
2. Turn the power on.
3. Press CD play button with no CD, cassette or MD loaded.
4. Press and hold the STOP button for at least 2 seconds, and
4. While pressing STOP on the unit, press 4 followed by
while still pressing the STOP button, press the Forward
7 on the remote. Display will now show CD E no disc,
Skip/Search button for at least 2 seconds. The unit enters
MD E no disc or TAPE E (E is shown by 3 horizontal
Self-Diagnostic Mode and display "TEST".
bars)
5. Pressing STOP will toggle between these displays.
5. While pressing STOP button on the unit, press 4 and 7 on
With MD E no disc in the display, continue with 10.4.3.
the remote control. The unit enters doctor mode for
adjustment.
Cautions
1. About handling the MD unit
• The magnetic head is a precision unit and is very
<Tuner>
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
23
Fig. 9
Fig. 10
SA-PM30MD