4.2. Power AMP (AMP PCB)
No audio output.
Protection is activated.
Is the power transistor open or short cir-
cuited?
2SB1560/2SD2390
Is the emitter resistor of the power transis-
tor open?
0.47 Ω
Is the base resistor of the power transistor
open?
4.7 Ω
Is the trimmer potentiometer between the
base of the power transistor open?
1k Ω
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
79
Содержание AVR-S710W
Страница 8: ...8 Personal notes ...
Страница 144: ...NJU72340AFH3 DIGITAL_ANALOG IC821 NJU72340A Terminal Functions 144 ...
Страница 147: ...2 FL DISPLAY FLD 018BT021GINK FRONT FL101 PIN CONNECTION GRID ASSIGNMENT 147 ...
Страница 148: ...ANODE CONNECTION 148 ...
Страница 168: ...EXPLODED REF No Part No Part Name Remarks Q ty New Ver S14 nsp SCREW CTW3 6JR VTW3 6JR 2 20 ...