Panasonic SA-AK22 Service Manual page 3

2001 Matsushita Electronics (S) Pte. Ltd. All rights reserved.
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1. Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C536, C545, C546 through a 10
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 230 V, 50 Hz in NO SIGNAL mode should be ~400mA.
2. 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.
Power consumption
Power consumption in standby mode
Dimensions (W x H x D)
Mass
SYSTEM
SC-AK22 (E)
SC-AK22 (EB)
SC-AK22 (EG)
Notes:
1. Specifications are subject to change without notice. Weight and
dimensions are approximate.
2. Total harmonic distortion is measured by the digital spectrum analyzer.
170 W
0.4 W
250 x 332 x 316 mm
8.2 kg
Music Center: SA-AK22 (E)
Speaker: SB-AK22 (E)
Music Center: SA-AK22 (EB)
Speaker: SB-AK22 (E)
Music Center: SA-AK22 (EG)
Speaker: SB-AK22 (E)
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