4
1.4.
Before Repair and Adjustment
Disconnect AC power to discharge unit AC Capacitors as such (C5700,C5701, C5703, C5704, C5705, C5708) through a 10
, 10
W resistor to ground.
Caution:
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 110~127 V, 60 Hz in Power ON, FM Tuner, No Signal, volume minimal mode should be ~ 400 mA.
Current consumption at AC 220~240 V, 50 Hz in Power ON, FM Tuner, No Signal, volume minimal mode should be ~ 300 mA.
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.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
Summary of Contents for SA-AKX12
Page 7: ... M ...
Page 15: ...15 5 3 Media Information ...
Page 26: ...26 7 3 D Amp IC Operation Control ...
Page 30: ...30 8 2 Main Components and P C B Locations ...
Page 52: ...Step 3 Step 4 Step 5 52 ...
Page 59: ...Step 9 Ground the 24P FFC with a short pin 59 ...
Page 70: ...13 Simplified Block Diagram 13 1 Overall Simplified Block Diagram 70 ...
Page 90: ... 90 ...
Page 95: ... 95 ...
Page 96: ... 0 96 ...
Page 97: ... 97 ...