Re: Sony Home Cinema Amp STR KSL5 problem
- From: "Michael Kinnaird" <mkinn@xxxxxxxxxxxx>
- Date: Sun, 22 Jan 2006 22:13:39 -0800
Could be any of the 5 output amps, the sensing
circuits or the CPU IC. You'll need a schematic to troubleshoot it. All 5 amps
have a transistor Q401-Q405 2SA1162 (Protect) near them which monitor current
flow to that output amp IC. These 5 all connect together to Q406 near IC321 on
the main board.
Q406 should have +5V on the collector. That
goes to pin 2 of IC321, out pin 3 of IC 321, then out connector D to Digital
board, thru R112 to pin 53 of IC101 (CPU IC) on the digital board.
If you have +5V on pin 53, the CPU is bad. Part #
6-800-673-01 IC101 MB90553ABPF-G-209-BND. You won't, so you have to find out
where the problem is.
"Davy H" <dave@xxxxxxxxx> wrote in message
news:1137752419.388128.54630@xxxxxxxxxxxxxxxxxxxxxxxxxxxx...
> I have a SONY a
home Cinema system (STR KSL5) which after about 2 mins> shuts down with the word PROTECT in the display screen. I have checked
> all the speaker outputs and they are fine, no shorts. I have removed
> all the speakers and the same problem occurs. The fan works so doesn't
> seem to be an overheating problem. This PROTECT fault occurs even when
> the volume is turned right down therefore not driving the amp. Anyone
> have any ideas what might cause this fault? and how to rectify it?
>
> Thanks
>
> Davy H
>
- References:
- Sony Home Cinema Amp STR KSL5 problem
- From: Davy H
- Sony Home Cinema Amp STR KSL5 problem
- Prev by Date: Re: Sony DVP S300 - distorted pic and sound
- Next by Date: Re: Sony KP53S25 Vertical Hold Problem
- Previous by thread: Re: Sony Home Cinema Amp STR KSL5 problem
- Next by thread: RCA TV 24V511T ch. M134C Turns On for 1 - 2 Secs, Goes Off
- Index(es):
Relevant Pages
|
