View Single Post
  #2   Report Post  
Posted to sci.electronics.repair
Mike Mike is offline
external usenet poster
 
Posts: 83
Default sony STR-D965 blown R channel

I removed the protector current detector from the right channel, and if i
scope it, the top half the wave is clipped off. meaning no drive to NPN?


and all resistor paths to the NPN is fine, so im suspecting the STK3102
driver is fuxified.


"Mike" wrote in message
...
Ok the front panel was dead, had 2 fuses blown, and the MN2488 and MP1620
was shorted in the right channel. the rest was fine.

Well, i replaced both fuses, replaced both outputs and the 2 10ohm base
resistors. I checked every other resistors and found things to be normal.
i replaced a high ESR 47uf cap also.

there was a small PNP transistor near the 2 outputs that was shorted also,
replaced that.


The set now turns on and works, except as soon as I hook a speaker up to
the right channel output, it goes into protector. i checked and double
checked the resistors in the output circuit. If i leave the speaker
unhooked, its fine. there is NO DC offset according to me meter on the
right channel. if i set the meter on AC, I can see the AC signal on the
meter, and on my scope just normal. if i hook the speaker up to the right
channel, it fires protector mode. the other channels work fine.

any ideas?