Re: Beocord 9000 no audio output

Mikemaxcel — Tue, 03 Aug 2010 03:39:07 GMT

I Have tried several times without success！The message just repeated itself and getting longer and longer...！？

Here is the original message posted:

The problem is caused by a faulty 7915(the measured voltage is -21V instead of -15V) and after replacing

the regulator, a dead 9000 comes to live but the output signals accompany with unexpected load annoying

cracking sound properly a symptom of burnt fets(Tr102 and Tr202) as the output are taken from R156 and R246.

The burnt PF5103 fets are difficult to get.

And now I needed to tackle the problems of audio dB level display.It seems the level display is in working order but with normal

audio signal input (0dB level),the display hardly shown above -20dB! When cracking distortion get in the level meter would shoot

to full scale to +5dB.

......

Re: Beocord 9000 no audio output

chartz — Tue, 03 Aug 2010 00:18:42 GMT

Hi there,

Your post has a problem, it is barely readable!

Could you please correct it?

Thank you,

Jacques

Beocord 9000 no audio output

Mikemaxcel — Mon, 26 Jul 2010 04:19:38 GMT

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Normal 0

The problem is caused by a faulty 7915（the measured voltage is -21V instead of -15V) and after replacing the

regulator, a dead 9000 comes to live but the output audio signals accompany with unexpected loud annoying cracking distortion sound properly a symptom of burnt fets(Tr102 and Tr202) as the outputs are taken from R156 and R256.

The burnt PF5103 fets are difficult to get.

And now I needed to tackle the problems of audio dB level display.It seems that the level display is in working order but with normal audio signal input ,the display hardly shown above -20dB! When cracking distortion sound get in,the level meter would shoot to full scale to +5dB.

And you can`t find any information given in regarding to the calibration of audio display meter.

Please help!

The Workbench

Re: Beocord 9000 no audio output

Re: Beocord 9000 no audio output

Beocord 9000 no audio output