4.2. Power AMP (AMP PCB)
No audio output.
Protection is activated.
Is the power transistor open or short circuit-
ed?
2SB1647/2SD2560
Is the emitter resistor of the power transis-
tor 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?
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
108
Содержание AVR-X4100
Страница 8: ...Personal notes 8...
Страница 25: ...Personal notes 25...
Страница 192: ...AK5358BET DIGITAL IC306 AK5358BET Pin Function 192...
Страница 199: ...NJW1194A INPUT IC484 BLOCK DIAGRAM 199...
Страница 200: ...2 FL DISPLAY FLD 17 BT 40GINK FRONT FL601 PIN CONNECTION GRID ASSIGNMENT Y2 q 200...
Страница 201: ...ANODE CONNECTION 201...