[TechAssist] Re: RCA TV mod. 20GT324 chas. CTC175A, partial schematic please
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 2 Dec 2002 19:58:18 -0500
Gary,
From RCA Fix Finder:
X-Ray Shutdown due to excessive Reg B+; Using a variac to control Reg B+,
U1001-30 was measured at .5V; Checking in Reg B+ circuit, R4157 was found to
be open. Replacing it restored normal B+ regulation. (Note: In this version
R4157 is actually a 143K instead of 95.3K, R4158 is an alternate value &
R4170 is not installed) .
Note: RCA Parts Finder lists the two values indicated above (143K and
95.3K). I guess it depends on the set. The RCA part numbers are as follows
for the two:
143K - RCA# 184980
95.3K - RCA# 217311
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, December 02, 2002 7:45 PM
Subject: [TechAssist] RCA TV mod. 20GT324 chas. CTC175A, partial schematic
please
>
> I have this RCA TV mod. 20GT324 chas. CTC175A which has a couple of
> problems. The standby power transformer has an open primary winding and
> R4157 is burnt open. I have the value for the resistor as 13k 1/4W
> flameproof. R4157 is connected to raw 168V B+, and on the other end I
> trace it to pin 30 of U1001V, LA7610 jungle IC. When I replace R4157, I
> get 2.3V dc on pin 30 of U1001V and the resistor draws too much current.
> If I lift the IC pin 30, I get 38V on that side of R4157. I tried
> replacing the IC but problem is still the same.
>
> Would anyone already have a partial schematic on their computer
> involving these parts they could email me so I can trace the short? (my
> fax is not working at the moment).
>
> Sams 3254 or 3383
>
>
> Thanks for any help.
>
> --
>
>
>
>
> Gary McCartney
>
> McCartney Electronics
> 7134 Fife Rd, RR 7
> Guelph Ontario Canada N1H 6J4
> Fax: (519)821-1530
> email: gary (at) number63.ca
>
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