CD PRO2 repair....

kUmSE · 24th February 2011, 11:02 AM

Hello out there

I have a B&O Beosound 3000 from '02 with a defective cd. The mechanism is a VAM 1253. It had difficuilty in reading the CD. When it succeed in reading the CD, it will play a couple of minutes, and return with the error (read in service mode) 37 : Translated in the service manual "Selection error". I cant figure out what that mean!

When it try to read the CD, the Focus is moving nice back and forth.
The output from the driver gives a nice output.

But the spindle motor does not run.
I can by the way see a wierd triangular waveform at the output from the driver, with a frequency of ~176khz.

This frequency is the same as the maximum operating frequency for the driver (TDA7073A). Maybee something is oscillating?
I can hear some acoustic noise when i rotate the disc with a finger.
But i cant really measure this triangular waveform at the input of the driver.

Have you heard about these driver fail?

Regards

Thomas

24th February 2011, 11:02 AM	#1
kUmSE diyAudio Member Join Date: Dec 2003 Location: Copenhagen	CD PRO2 repair.... Hello out there I have a B&O Beosound 3000 from '02 with a defective cd. The mechanism is a VAM 1253. It had difficuilty in reading the CD. When it succeed in reading the CD, it will play a couple of minutes, and return with the error (read in service mode) 37 : Translated in the service manual "Selection error". I cant figure out what that mean! When it try to read the CD, the Focus is moving nice back and forth. The output from the driver gives a nice output. But the spindle motor does not run. I can by the way see a wierd triangular waveform at the output from the driver, with a frequency of ~176khz. This frequency is the same as the maximum operating frequency for the driver (TDA7073A). Maybee something is oscillating? I can hear some acoustic noise when i rotate the disc with a finger. But i cant really measure this triangular waveform at the input of the driver. Have you heard about these driver fail? Regards Thomas

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