Read Panasonic KV-SS905C Service Manual online
1 GENERAL PRECAUTIONS
1.1. Safety Precautions
1. Before servicing, unplug the power cord to prevent electrical shock hazard.
2. When replacing parts, user only manufacture’s recommended components for safety.
3. Check the condition of power cord. Replace if wear or damage is evident.
4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
5. Before returning the serviced equipment to the customer, perform the following electrical tests to prevent shock hazard.
1.2. Electrical Tests
1. Unplug the power cord and check for continuity between the earth ground connection on the plug and the Interface Board
Cover. There should be zero ohm resistance.
2. With the unit unplugged, short the AC live-neutral of the plug with a jumper wire.
3. Turn ON the power switch.
4. Measure the resistance value with an ohmmeter between the jumpered AC plug and an exposed metal cabinet part, such as
screwheads, etc. (Refer to Fig.2)
Note
Some exposed parts may be isolated from the chassis by design. They read infinity.
5. If the measurement is less than 1M
Ω
, a possibility for electric shock may exit.
Note
This hazardous condition must be corrected before the unit is returned to the end user.
Fig. 1
Fig. 2
1.3. For Service Technicians
ICs and LSIs are vulnerable to static electricity. When repairing, the following precautions will help to prevent recurring
malfunctions.
malfunctions.
1. Cover the plastic parts with aluminum foil.
2. Ground the soldering irons.
3. Use a conductive mat on the worktable.
4. Do not grasp IC or LSI pins with bare fingers.
4
KV-SS905C
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