Safety Precaution; Before Repair And Adjustment - Panasonic SA-AK110P Service Manual

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1 Safety Precaution

(This "Safety Precaution" is applied only in U.S.A.)
1. Before servicing, unplug the power cord to prevent an electric shock.
2. When replacing parts, use only manufacturer's recommended components for safety.
3. Check the condition of the 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, be sure to make the following insulation resistance test to prevent the
customer from being exposed to a shock hazard.
1.1. Insulation Resistance Test
1. Unplug the power cord and short the two prongs of the plug
with a jumper wire.
2. Turn on the power switch.
3. Measure the resistance value with ohmmeter between the
jumper AC plug and each exposed metal cabinet part, such
as screwheads, antenna, control shafts, handle brackets,
etc.
Equipment with antenna terminals should read between
2.7MΩ and 3.9MΩ to all exposed parts*. (Fig.1)
Equipment without antenna
approximately infinity to all exposed parts. (Fig.2)
*Note : Some exposed parts may be isolated from the
chassis by design. These will read infinity.
4. If the measurement is outside the specified limits, there is a
possibility of a shock hazard. The equipment should be
repaired and rechecked before it is returned to the
customer.

2 Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C520 and C540 through a 10Ω, 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 120V, 60 Hz in NO SIGNAL mode should be ~600mA.
terminals should read
3
SA-AK110P /
Fig.1
Fig.2