[TechAssist] Re: Rca CTC-169CL5 lightbulb placement?
- From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 21 Dec 2002 08:51:45 -0500
The TV should stay on, the micro looks at the 9V supply from the SMPS which
is created from the 14V source (CR4118). This supply drives the horiz osc in
the video jungle, so it's monitored, but then I think the vert circuit is
monitored also....since it's supply comes from the IHVT, it could possibly
shut down. Check for H drive at the Horiz Base or the Horiz drive transistor
with the bulb connected, if so then you know that part of the circuit is
working at least. Of course the original complaint is the HOT gets munched
rather quickly, so the important thing to monitor is the loaded B+ which
should be 143 - 145V. That will isolate the problem to the power or Horiz
output side.
I'm betting the Horiz output side is at fault. After verifying the B+ is
good, I'd reattach the output Transistor, hang my scope on the collector and
fire it up, hoping to see the retrace pulse without blowing the transistor
again. A single raggy looking pulse (not multiple pulses) has always led me
to the retrace caps, especially if the rag is on the left-leading side of
the pulse. A really low pulse or wide pulse would point to the retrace diode
or the IHVT, and multiple pulses generally point to the IHVT.
A bad Splitter will pull down a pulse, as will a bad CRT, but I'd have that
section of the system completely disconnected before I'd run these tests,
and add them on as I proceeded.
Damon Brunger
damon101@xxxxxxxxxxxxxx
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Pete" <wpt19@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, December 21, 2002 4:04 AM
Subject: [TechAssist] Re: Rca CTC-169CL5 lightbulb placement?
>
>
> That's is a good test, but does the set state on without the horizontal
> pulses to the micro?, or the low voltages sources from the flyback
> txmer?
>
>
> Pete
>
> Perdomo TV Inc.
> Miami, Fla.
> wpt19@xxxxxxxxx
>
>
> E-mail message
>
> Sender: techassist-bounce@xxxxxxxxxxxxx From: DAMON101@xxxxxxxxxxxxxx
> (Damon) Date: Fri, Dec 20, 2002, 11:37pm To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Rca CTC-169CL5 lightbulb placement?
> Reply=A0to: techassist@xxxxxxxxxxxxx
>
> Allows you to verify the power supply is regulating under a load.
> Damon Brunger
> damon101@xxxxxxxxxxxxxx
> Telrad Electronic Services
> Ft Wayne, IN 46815
>
> ----- Original Message -----
> From: "Pete" <wpt19@xxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, December 20, 2002 7:24 AM
> Subject: [TechAssist] Re: Rca CTC-169CL5 lightbulb placement?
>
> Hook up bulb from collector to ground of the HOT?.... can you please
> describe the purpose of this test?
> Pete
> Perdomo TV, Inc.
> Miami Fla.
> wpt19@xxxxxxxxx
>
> techassist-bounce@xxxxxxxxxxxxx From: DAMON101@xxxxxxxxxxxxxx (Damon)
> Date: Thu, Dec 19, 2002, 9:54pm To: techassist@xxxxxxxxxxxxx Subject:
> [TechAssist] Re: Rca CTC-169CL5 lightbulb placement? Reply=3DA0to:
> techassist@xxxxxxxxxxxxx
>
> Remove HOT, hook up bulb from collector to ground
>
> ----- Original Message -----
> From: "Mitchs Electronics" <Mitchstv@xxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, December 19, 2002 10:32 AM
> Subject: [TechAssist] Rca CTC-169CL5 lightbulb placement?
> Guys, cant find my Idiot sheet on where to place the 60 watt lightbulb
> in HOT stage. was it
> A. In series Emitter to ground with the 1885 in circuit, Or
> B. Remove the 1885 and series it collector to emitter? Hate to waist
> another 1885 even at $3.00.
> Thanks
> =A0=A0Rick Mitchell
> Mitch's Electronics Ser.Co.
> Mitchstv@xxxxxxxxxx
> 3935 south 20th
> Lincoln, Nebraska 68502
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