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Preamplifier damaged explosion Class-d Crest
Preamplifier damaged explosion Class-d Crest
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Old 20th November 2009, 06:10 PM   #1
lee1976 is offline lee1976  Poland
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Join Date: May 2009
Location: 52.740N, 15.230E
Default Preamplifier damaged explosion Class-d Crest


Amp. CREST CD-series, model CD3000

Amplifier received after attempting to repair, as you can see he learned, the damage that such an amplifier.
Please support the identification of elements of the original and the missing.
No items id PCBs U26, U33, U34, U35, 5 pin (SOT25 SMD probably)
Identification of elements of D50 and D51 with the symbol of G14 C430, stabilizer 78M .... ( photo 2, 3 )
Maybe someone has a fragment of the preamplifier scheme.
The amplifier itself can manage because the second channel is complete.
The damaged channel transistors and explosion IR2110 output and relay output.

Please forward suggestions and tips ... and diagram a pre-amplifier

Thank you very much.

U26, U33, U34, U35

Diode D4 - what model/type ?
Attached Images
File Type: jpg crest amp1.jpg (894.4 KB, 307 views)
File Type: jpg crest amp2.jpg (248.3 KB, 254 views)
File Type: jpg c1.jpg (263.1 KB, 228 views)
File Type: jpg c2.jpg (833.8 KB, 218 views)
File Type: jpg c3.jpg (832.8 KB, 204 views)

Last edited by lee1976; 20th November 2009 at 06:32 PM. Reason: change gallery
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Old 21st November 2009, 11:46 AM   #2
Eva is offline Eva  Spain
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Try using the working channel to identify the parts, small SMD parts use two or three letters and the type of package for identification, try googling the letters and the package type.

Also, could you post more pictures? (also of the whole amplifier to see overall layout). I see the missing SOT23-5 (but not the type of the ICs near) but I fail to see the rest.
I use to feel like the small child in The Emperor's New Clothes tale
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Old 21st November 2009, 06:39 PM   #3
lee1976 is offline lee1976  Poland
diyAudio Member
Join Date: May 2009
Location: 52.740N, 15.230E
Eva, Thank you for your interest

amplifier output stage - I have complete the second channel so no problem the repair of damaged canal

The problem is with the SMD components to preamplifier

1.I miss the elements around the IC system, with symbols U26, U33, U34, U35 (picture above link)
2.Stabilizer broke, do not know what symbol?
3.I do not know what kind of diodes D50 and D51 and D4 in the attached pictures. I was looking at Google's symbol diodes D50 and D51, and unfortunately I did not find any information
4. The other elements is needed scheme

I'll add more photos tomorrow

Thank you for your help
Regards. Lee
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