Denon UD-M30 Repair

[admin_exported]

Hi,

I have bought a secondhand UD-M30 and found the left channel is slightly distored and weak. I belive the Left channel has been short circuited and damaged the STK-405-050A amplifer IC.

I ordered a STK-405-050A not made by Sanyo and fitted the IC. Now when I turn on the system I get a protection overide message I resoldered and still the same message. I changed the STK-405-050A back to the original and the system works as before.

Do I have a faulty STK-405-050A or do I have to buy a denon STK-405-050A?

Hope someone can help.

Thanks

 

[Crocodile]

I'd have thought the chances of a duff component are fairly slim but not impossible. Is the rear of the package metal? Maybe double check that there are no shorts to the heatsink with the new component.

 

[eggontoast]

Hi,

I have bought a secondhand UD-M30 and found the left channel is slightly distored and weak. I belive the Left channel has been short circuited and damaged the STK-405-050A amplifer IC.

I ordered a STK-405-050A not made by Sanyo and fitted the IC. Now when I turn on the system I get a protection overide message I resoldered and still the same message. I changed the STK-405-050A back to the original and the system works as before.

Do I have a faulty STK-405-050A or do I have to buy a denon STK-405-050A?

Hope someone can help.

Thanks

Wher did you get the STK pack from and what manufacturer made it ?

 

[Anonymous]

Hi & thanks for replies, Crocodile – The back is metal but there was so little heat transfer paste on the original and no insulation layer so I think contact between the heat sink and IC should be ok but I guess I could always try to insulate it to see. Eggontoast – I miss wrote the original post and didn’t know how to change it. It is a Sanyo IC bought from Nikko Electronics KT19 0DT.