Panasonic SA-NC9GC, Service Manual

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1.2. Safety Precaution for AC Power Supply Cord (For GS only)
1.3. Before Use (For GS/GCS only)
Be sure to disconnect the mains cord before adjusting the voltage selector.
Use a minus(-) screwdriver to set the voltage selector (on the rear panel) to the voltage setting for the area in which the unit will
be used. (If the power supply in your area is 110V or 127V, set to the “127V” position.)
Note that this unit will be seriously damaged if this setting is not made correctly. (There is no voltage selector for some countries,
the correct voltage is already set.)
1.4. Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C5951 through a 10
Ω
, 5W resistor to ground.
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
Current consumption at AC 110 ~ 127V, 50 / 60 Hz in NO SIGNAL (vol. min, at CD mode) should be ~900mA. [For GCS/GS only]
Current consumption at AC 220 ~ 240V, 50 / 60 Hz in NO SIGNAL (vol. min, at CD mode) should be ~500mA . [For GC/GCS/GS
only]
Current consumption at AC 230 ~ 240V, 50 Hz in NO SIGNAL (vol. min, at CD mode) should be ~500mA . [For GN only]
1.5. 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.
· Sound stops 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 systems with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines 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.
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SA-NC9GC / SA-NC9GS / SA-NC9GCS / SA-NC9GN