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Board index » DIY Forums » Solid State / Op-Amps / Chip Amps / Class-D

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Rotel RA-935BX help

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gregkr

Post subject: Rotel RA-935BX help

Posted: 11 Dec 2015, 21:14

Joined: 30 Nov 2015, 10:26
Posts: 3
Location: Birmingham / UK

Hi.
I have a Rotel RA-935BX amp. while adjusting the Bias I accidentally slipped with the probe and shorted out pin tp2 to j36 what looks like a bridging wire, resulting in a blown fuses f901 and f902 [all positions are taken from pcb markings].
When I replace the fuses and power ON the amp the ON led flashes for a second and same fuses blow again and all goes dead. I think I have probably blown a 2SB817E transistor. But I would like to ask if there is anything I can check to see what I have damaged and how to check it. I have wiring manual but being a newbie I don't know where to start checking. I do own Fluke 112 rms multi meter and I'm not too bad with soldering iron but that is where it ends. Thanks in advance for all your help. Greg

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gregkr

Post subject: Re: Rotel RA-935BX help

Posted: 16 Dec 2015, 18:36

Joined: 30 Nov 2015, 10:26
Posts: 3
Location: Birmingham / UK

Hi.
Just an update the amp is up and running it was a pre-driver transistor 2SA1507 shorting out and a rectifier diode.

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