4.2. Power AMP (AMP PCB)
No audio output.
Protection is activated.
Is the power transistor open or short circuit-
ed?
2SB1560/2SD2390
Is the emitter resistor of the power transistor
open?
0.22Ω
Is the base resistor of the power transistor
open?
22Ω
Is the trimmer potentiometer between the
base of the power transistor open?
1kΩ
Are any other transistors faulty?
Are any other resistors faulty?
Turn on the power and check that the voltage of each part is correct and that there is an idling
current.
Replace the power transistor.
Replace the transistor.
Replace the resistor.
Replace the emitter resistor.
Replace the base resistor.
Replace the trimmer potentiometers.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
85
Summary of Contents for NR1605/FB
Page 8: ...Personal notes 8 ...
Page 26: ...Personal notes 26 ...
Page 103: ...CX870 7P 8P 5P PLATE PLATE 2P 7P 4P 7P 11P 5P 8P PLATE S30SC6MT WIRING DIAGRAM 103 ...
Page 140: ...Personal notes Personal notes 140 ...
Page 161: ...2 FL DISPLAY FLD 018BT021GINK FRONT U4400 PIN CONNECTION GRID ASSIGNMENT q T7 161 ...
Page 162: ...ANODE CONNECTION 162 ...