[TechAssist] Re: RCA ProJo PTK169PABS
- From: "albert marquardt" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 21 Nov 2001 08:06:48 -0800
sounds to me like the run regulator isn't working. look for a pwm feedback
signal at pin 2 of u4101.if the pulses are present the regulator control
circuit is probably working.if the signal is missing check for a 2vp-p
horizontal rate ramp on base of q4106 if you need more info contact me this
is out of a training manual.
al marquardt
ampm@xxxxxxx
----- Original Message -----
From: OrpheusComputing.com Repair <techassist@xxxxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, November 21, 2001 3:05 AM
Subject: [TechAssist] Re: RCA ProJo PTK169PABS
>
> (Name?), here's some info that may help.
>
> Replace CR4118, C4108, CR4402, C4402 & C4401
> even if they check good. Also check CR4101, CR4606,
> CR4111, C4105, Q4101, CR4122, CR4123, R4150, R1928,
> R4114, C4705, C4115, CR4709, C4145, C414, CR3101,
> R4150, C4141, SCR501, CR4504, C4503, R3126, CR4303,
> CR4710, C4145, Q4105, R4102, C3124, R4704, R4713,
> Q3102, R4904, U4101, the yoke, pin of 12-13 of T4102
> could be open, resolder L4803 & T4401, and possibly
> L4702, U4801, U1902, Q4302 check for shorts (pin 1-3) in
> U1901 If you are getting ~15v from the PS, IC3101 & Q4601
> could be bad. If it's down below 15v, replace C4145.
> -Clint
>
> God Bless Us All
> Clint Hamilton, Owner
> http://OrpheusComputing.com
> http://ComputerHardware-ConsumerElectronics.com
> sales@xxxxxxxxxxxxxxxxxxxx
> Fax: 209-882-9602
> TechAssist Administration
> http://tech-assist.org
> techassist@xxxxxxxxxxxxx
>
>
> ----- Original Message -----
> From: <tvdoctors@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, November 20, 2001 5:03 PM
> Subject: [TechAssist] RCA ProJo PTK169PABS
>
>
> OK here's the deal: I brought this projector module into my
> shop and found R767U open and R763U to be discolored. I
> replaced these with the high voltage splitter and checked
> other surrounding components. Set still won't activate. My B+
> is 130 volts and all other secondary voltages are right on
> the track. I have a good pulse to the base of the horiz..
> Output transistor. When I push the power button, I notice
> that the 130 volts gets loaded down to around 70 volts. If I
> disconnect the anode lead from the splitter and clip a lead
> from about a tenth of an inch from the lead to ground, it
> makes a spark once then shuts down, so I know my high voltage
> is trying to come up, but shuts down. I've checked the caps
> in the horiz.output collector circuit and they check good.
> The only thing I can find out of place is my 130 volt line is
> dropping down. Has anyone had a problem like this in the
> past? Could it be the flyback? Thanks for input on this.
> My customer would like to have this set back before
> Thanksgiving. N
>
> TV Doctors 108 W. Main St. Monroe,Wa. 98272
> 360-794-6469
>
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