MOSFETs in Definitive Technology Pro Sub 1000 Defaced

[evansluytman]

I have never seen this done, hence this post:

I acquired a Definitive Technology ProSub 100 that has stopped working. I opened it up and noticed the POS+ and NEG- strips on the PCB after the caps were burnt open. I corrected that and moved on to the output stage. The FETs were shorted. OK so I just replace those and it'll be good to go.

When I removed the FETs, I noticed they were all defaced . Someone took the time to scratch of the ID numbers on all three components. This unit was never repaired/opened, so it had to have come from the manufacturer like that.

Has anyone ever seen this done at the manufacturing level, or at any level? I will need a schematic to identify these components. If anyone can help that would be awesome.

 

[TundraLTD]

have you tried calling/emailing tech support? I've had companies send me parts no charge before by just asking for the part by the board ID #

 

[evansluytman]

I did send out an email. Will update if anything comes back.

 

[evansluytman]

Update: I was able to locate the part numbers. Apparently the Electro-Voice SXA180 subwoofer uses the same output module (DS-300), and I found the schematic here. Works out great.

 

[lawbadman]

How is the amp performing? Is it what you expected? How is the sound?


Thanks

 

[tiefbassuebertr]

Update: I was able to locate the part numbers. Apparently the Electro-Voice SXA180 subwoofer uses the same output module (DS-300), and I found the schematic here. Works out great.

This Class-D module (DS-300) is also to find in Infinity's powered subwoofer model No "TSS-SUB4000" - go to page 30 of follow pdf-service-manual:
http://diagramasde.com/diagramas/audio/TSS-SUB4000 Infinity subwoofer service manual.pdf
and this URL:
Electro help: INFINITY TSS-SUB4000 - POWER AMPLIFIER SCHEMATIC (Circuit Diagram)
if this site don't goes open, try this URL:
INFINITY TSS-SUB4000 - POWER AMPLIFIER SCHEMATIC (Circuit Diagram) | Electro help
Troubleshooting instructions:
http://electro-medical.blogspot.de/...sub4000-active-sub-woofer.html?view=flipcard#!

 

[nigelwright7557]

Defacing of electronic components was often used to stop people messing with equipment and make them send it back to manufacturer to fix.