9BST repair

Discuss Bryston's modular 5-channel 9BSST² amplifier and all previous versions of the 9B

9BST repair

by Luciano-Audiogene » Wed Sep 24, 2014 3:42 pm

Hello everyone,

Recently I did a repair in 9BST model, was a short on transistors in a module, after that I applied 9BST SST Mod Rev2. (change transistors SJ6521 and SJ 6522 TO-3 by TRMJ21194 and TRMJ21193 remove caps and add new one and add parallel diode) I followed all instruction on the tech bulletin, after that I perceived two things:

1 - the module has a excessive heat;

2 - I can't do the Bias adjustment (in 8mv how indicated).

If anyone has any suggestions ,I thanking you in advance.

Best regards :roll:
Luciano Carvalho - Audiogene Brazil
Luciano-Audiogene
 
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Re: 9BST repair

by Luciano-Audiogene » Wed Sep 24, 2014 7:51 pm

***one more important thing to describe it's about the frontal Led , I perceived this Led (module was repaired) blinks in Red .
Luciano Carvalho - Audiogene Brazil
Luciano-Audiogene
 
Posts: 7
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Location: Brazil

Re: 9BST repair

by Gary Dayton » Wed Sep 24, 2014 8:56 pm

Hi Luciano,

You said you can't do the bias adjustment. Are you not able to reach the correct voltage? Or, something else is preventing you from doing it?

--Gary / Bryston
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Re: 9BST repair

by Luciano-Audiogene » Thu Sep 25, 2014 8:15 pm

Hi Gary,
Firstly thank you for your reply.

I just can't reach adjustment in 8 mv !

when I measure around 5.4 mV the heatsink is very heat and the voltage jumps to 300 mV instantly, after this the front Led turn on in Red and the module stops work (heat protection).

best regards,
Luciano Carvalho - Audiogene Brazil
Luciano-Audiogene
 
Posts: 7
Joined: Wed Sep 24, 2014 3:28 pm
Location: Brazil

Re: 9BST repair

by Luciano-Audiogene » Mon Dec 15, 2014 1:57 pm

Dear sirs, we've received a new Amp module to solve it.

Many thanks for your help in this matter.

Best regards. :D
Luciano Carvalho - Audiogene Brazil
Luciano-Audiogene
 
Posts: 7
Joined: Wed Sep 24, 2014 3:28 pm
Location: Brazil


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