Aktuelle Version von: jayeff
Titel:
Why audio amplifier is blowing fuse?
Original-Beitrag von::
| I have an audio amplifier (FPL 400) which constantly blow its fuse when started. I reproduce it even without speaker connected or audio input source. | |
| The fuse is located just after the power supply cable. | |
| I did tests by isolating some parts. When I disconnect the cable A and B, the fuse blow but when I disconnect the cable C, it didn't blow (see photo). So the cause must be in the main card. | |
| [image|1495577] | |
| [image|1495578] | |
| No component of this card seems visually to be degraded, so I don't know which one is defective. | |
| With a multimeter, how can I identify the defective component? | |
| I did my tests with slow fuses, same as provided by the manufacturer (T1AL250V). I also tested the diode bridge after having unsoldered it and it was ok. | |
| === Update (07/04/2018) === | |
| - | |
| 2 of the transistors looks to be ok (between 0.5 to 0.6 with the diode test). The 2 others ones are both at 0.0v. |
Gerät:
| - | |
|---|---|
| + | Home Audio Amplifier |
Status:
open
Akzeptierte Antwort:
497979
Bearbeitet von: Alain
Titel:
Why audio amplifier is blowing fuse?
Original-Beitrag von::
I have an audio amplifier (FPL 400) which constantly blow its fuse when started. I reproduce it even without speaker connected or audio input source. The fuse is located just after the power supply cable. I did tests by isolating some parts. When I disconnect the cable A and B, the fuse blow but when I disconnect the cable C, it didn't blow (see photo). So the cause must be in the main card. [image|1495577] [image|1495578] No component of this card seems visually to be degraded, so I don't know which one is defective. With a multimeter, how can I identify the defective component? I did my tests with slow fuses, same as provided by the manufacturer (T1AL250V). I also tested the diode bridge after having unsoldered it and it was ok. === Update (07/04/2018) === 2 of the transistors looks to be ok (between 0.5 to 0.6 with the diode test). The 2 others ones are both at 0.0v.
Gerät:
amplifier
Status:
open
Akzeptierte Antwort:
| + | 497979 |
|---|
Bearbeitet von: Alain
Titel:
Why audio amplifier is blowing fuse?
Original-Beitrag von::
| I have an audio amplifier (FPL 400) which constantly blow its fuse when started. I reproduce it even without speaker connected or audio input source. | |
| The fuse is located just after the power supply cable. | |
| I did tests by isolating some parts. When I disconnect the cable A and B, the fuse blow but when I disconnect the cable C, it didn't blow (see photo). So the cause must be in the main card. | |
| [image|1495577] | |
| [image|1495578] | |
| No component of this card seems visually to be degraded, so I don't know which one is defective. | |
| With a multimeter, how can I identify the defective component? | |
| I did my tests with slow fuses, same as provided by the manufacturer (T1AL250V). I also tested the diode bridge after having unsoldered it and it was ok. | |
| + | |
| + | === Update (07/04/2018) === |
| + | |
| + | 2 of the transistors looks to be ok (between 0.5 to 0.6 with the diode test). The 2 others ones are both at 0.0v. |
Gerät:
amplifier
Status:
open
Original-Beitrag von: Alain
Titel:
Why audio amplifier is blowing fuse?
Original-Beitrag von::
I have an audio amplifier (FPL 400) which constantly blow its fuse when started. I reproduce it even without speaker connected or audio input source. The fuse is located just after the power supply cable. I did tests by isolating some parts. When I disconnect the cable A and B, the fuse blow but when I disconnect the cable C, it didn't blow (see photo). So the cause must be in the main card. [image|1495577] [image|1495578] No component of this card seems visually to be degraded, so I don't know which one is defective. With a multimeter, how can I identify the defective component? I did my tests with slow fuses, same as provided by the manufacturer (T1AL250V). I also tested the diode bridge after having unsoldered it and it was ok.
Gerät:
amplifier
Status:
open