[TechAssist] Re: RCA Proj. CTC169PA P52750WK B+ too high/dead
- From: HSWAD@xxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 27 Nov 2002 16:28:12 EST
You didnt say what the regulated B+ was after you changed parts. Measure it
with the set ON. Hollis Bates, field engineer-retired
In a message dated 11/27/02 2:33:35 PM
Eastern Standard Time, videotech@xxxxxxxxxxxx writes:
> Subj:[TechAssist] RCA Proj. CTC169PA P52750WK B+ too high/dead
> Date:11/27/02 2:33:35 PM Eastern Standard Time
> From:<A HREF="mailto:videotech@xxxxxxxxxxxx";>videotech@xxxxxxxxxxxx</A>
> Reply-to:<A
> HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx</A>
> To:<A HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx</A>
> Sent from the Internet
>
>
>
>
> Hi guys, have a lightbox for a CTC169PA projection set that seems to
> not be regulating correctly. Raw B+ is 159v, pin 16 of U4101 is 11.5v,
> Cr4118`s cathode is 14.85v, but cathode of cr4116 is 155v, if I hold
> down the power button this voltage drops to 80 volts and something in
> the power supply tics, I`ve replaced, C4102,104,108, Cr4118 & C4145,
> checked across CR4123 and have 5.6 volts, Regulated B+ was 167v before
> replacing C4102,104 & 108. My tech notes say this problem is caused by
> either C4102 or CR4123 is zenering at 8.6v instead of 5.6v. Obviously
> this isn`t the problem, any ideas ??? tia, Larry E
> --
> Larry Eastman
> American TV & Electronics
> Crystal River, Fl.
> http://www.tvjunkyard.com
>
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