Panasonic SC-EN17P, Руководство по обслуживанию

Страница: 5 / 48

4 Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:
· No sound is heard when the power is turned on.
· Stop during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires
are “shorted”, or if speaker with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outline below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
5 Handling Precautions For Traverse Deck (Optical
Pickup)
The laser diode in the traverse deck (optical pickup) may break down due to potential caused by static electricity of clothes or
human body. So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup).
·
Handling of traverse deck (optical pickup)
1. Do not subject the traverse deck (optical pickup) to static electricity as it is extremely sensitive to electrical shock.
2. To prevent the breakdown of the laser diode, an antistatic shorting pin is inserted into flexible board (FFC board).(Fig.1)
3. Take care not to apply excessive stress to the flexible board (FFC board). When removing or connecting the short pin, finish
the job in as short time as possible.
4. Do not turn the variable resistor (laser power adjustment). It has already been adjusted.
· Grounding for electrostatic breakdown prevention
1. Human body grounding (Fig.2)
Use the anti-static wrist strap to discharge the static electricity from your body.
2. Work table grounding (Fig.2)
Put a conductive material (sheet) or steel sheet on the area where the traverse deck (optical pickup) is place, and ground
the sheet.
Caution:
The static electricity of your clothes will not be grounded through the wrist strap. So, take care not to let your clothes touch
the traverse deck (optical pickup).
Caution when replacing the Traverse Deck
The traverse deck has a short point shorted with solder to protect the laser diode against electrostatics breakdown. Be sure
to remove the solder from the short point before making connections.
5
SC-EN17P / SC-EN17PC