[TechAssist] Re: RCA TV CTC178 proj. - question about B+ 135V
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 23 Jun 2005 15:16:39 -0400
I think they didn't want some pot-turner tube jocky to touch it due to
it's potential of increasing the HV. Set it and dribble a bit of silicon
or hot melt glue on it...sealed!
Phil
PS: Now ad a sign on it saying GARY (not RCA)doesn't want you to
adjust this pot!
;-)
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
Gary McCartney wrote:
>I have this CTC178 projection which originally some mouses pee'd on the
>chassis causing it to not start up. After many lengthy repair sessions,
>I now believe I have it running properly (will post the fixes shortly).
>
>I do have a question though. The mouses pee'd around the SMPS area of
>the board (among other ares) so I had to replace R4912 which is a
>factory sealed trim pot (warning in service manual to use only the
>official kit). I just used a trim pot I had and maybe a few related
>parts (been a long while and I can't remember exactly). The B+ was
>running at 127V with the pot set at center. The service manual says it
>is a 135V B+ supply. I have now adjusted the B+ to 135V. Checked the
>Xray shut-down tests which function OK).
>
>Is that good enough or is there another reason why RCA wants us to only
>use the factory supplied kit?
>
>Thanks for any help.
>
>
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