Pay close attention to the following two points when removing/attaching the DAMP PCB to the MAIN
PCB.
1. Wait for approximately 5 minutes after turning the power off before removing the wire connector
that connects the SMPS PCB and DAMP PCB.
When connected to the SMPS PCB wire connector, a surge current may flow due to the charge stored
in the AMP PCB causing damage to the DAMP IC70.
2. When attaching the DAMP PCB to the MAIN PCB connector, insert the connector pins into the DAMP
PCB in advance, and securely connect while checking that the position is correct.
If the MAIN PCB and DAMP PCB terminals are connected incorrectly (if the connection pins are mis-
aligned), the PWM Processor IC40 and DAMP IC70 may be damaged by the charge stored in the con-
denser.
Removing the DAMP PCB from the MAIN PCB
NOTES ON HANDLING AND REPLACEMENT OF THE LASER PICK-UP
1. Protection of the LD
Solder a part of the LD circuit to short-circuit. After connecting the circuit, remove the soldering form.
Precautions when handling the laser CD mechanism
2. Precautions when handling the laser CD mechanism
• Be careful not to expose the laser pick-up to dust.
• Do not leave the laser pick-up bare. Be sure to cover it.
• If dust adheres on the laser pick-up lens, blow it off with a blower brush.
• Do not apply shock to the laser pick-up.
• Do not watch the light of the laser pick-up.
3. Cautions on assembling and adjustment
• Be sure that the bench, jig, head of soldering iron (with ceramic) and measuring instruments are well
grounded.
• Workers who handle the laser pick-up must be grounded.
• The finished mechanism (prior to anchoring in the set) should be protected against static electricity
and dust.
The mechanism must be stored where abnormal external force is not applied.
• When carrying the finished mechanism, hold it by the chassis body.
• Do not use or store the mechanism where corrosive gas such as H2S, SO2, NO2 and CI2 or toxic gas
may be generated, or where substances especially organosilicon, cyanide, formalin and phenolic
materials exist. In particular, make sure that these substances which generate toxic gas do not exist in
the set. This may cause the motor not rotating.
4. Notes on Handling the Laser Pick-Up
Check lop in "
SPECIAL MODE
"(Laser drive current). (See "
1-7-7. Displaying the laser current
")
• If the present Iop (current) value is "
60 mA
" or higher, replace the Traverse unit with a new one.
• No mechanical adjustment is necessary after the replacement.
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
56
