4.2. Power AMP (AMP PCB)
No audio output.
Protection is activated.
Is the power transistor open or short circuited?
2SB1560 / 2SD2390
Is the emitter resistor of the power transistor open?
0.47 Ω
Is the base resistor of the power transistor open?
22 Ω
Is the trimmer potentiometer between the base of
the power transistor open?
1 k 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
81
Содержание SR5010/K1B
Страница 8: ...Personal notes 8 ...
Страница 100: ...POWER DIAGRAM S2 8V 8V MAIN TRANS S1 AMP B MAIN PWR ON VCC DIAGRAM AC CORD 100 ...
Страница 156: ...2 FL DISPLAY FLD GP1261AI FRONT FLT4400 PIN CONNECTION PATTERN DETAIL 156 ...
Страница 157: ...ANODE CONNECTION 157 ...