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
79
Содержание NR1606/FB
Страница 8: ...Personal notes 8 ...
Страница 98: ...POWER DIAGRAM S5 VKK S4 VIDEO S2 8V 8V MAIN PWR ON S3 TRIGGER S1 AMP B S6 FILAMENT OPEN AC CORD MAIN TRANS 98 ...
Страница 132: ...Personal notes Personal notes 132 ...
Страница 134: ...Personal notes Personal notes 134 ...
Страница 150: ...2 FL DISPLAY FLD 018BT021GINK FRONT U4400 PIN CONNECTION GRID ASSIGNMENT q T7 150 ...
Страница 151: ...ANODE CONNECTION 151 ...