[TechAssist] Re: CTC 187BD2 FIXED has bow now.
- From: "Richard Golden d.b.a. Golden Video Repair Center" <reldong@xxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 7 Jan 2002 21:49:31 -0800
CTC187bd2 Came in dead.
Thanks Dennis,Gonzalo,Al,Wayne for your help;
I replaced U4101 and CR4109, unit is working now.But
had slight bow on sides.I replaced CR4303 took some
of the bow out.It now has a full picture,but still bowed.
And it is now, a little to wide.And picture narrows when I change channels,
or G2 (screen) I suspect C4303.I don,t
have it in stock,I am going to order it tomorrow,
thanks very much.
Richard
----- Original Message -----
From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, January 06, 2002 10:20 PM
Subject: [TechAssist] Re: CTC 187BD2 dead
> I'm confused. Originally you stated that U4101(4) =0 volts. Are you now
saying
> that it is really 1.3 volts? Or only when you isolate the pin on U4101(4)?
>
> It appear that U4101 is not running. I would try to start this device at
low
> voltage. Using a variac at 10 vac should start this supply running and
when the
> the A.C. voltage gets to about 40 vac the secondary will rise to near
normal
> levels. If it never starts oscillation then I would suspect U4101.
>
> If oscillation starts and exceeds secondary voltages and shuts off suspect
> C4127 or associated circuit. This is the filter for the feedback
comparison for
> the error amp in U4101.
>
> Dennis Viereck
>
>
>
>
> "Richard Golden d.b.a. Golden Video Repair Center" wrote:
>
> > r4104 has 165v in out 1.3v out , then unsoldered u4101 now has 144v out
of
> > r4104, resistor is good, replace u4101 or?
> > thanks
> > Richard
> >
> > ----- Original Message -----
> > From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Sunday, January 06, 2002 9:03 PM
> > Subject: [TechAssist] Re: CTC 187BD2 dead
> >
> > >
> > > Assuming U4101(4) is at 0 volts then I would have to check R4104 a 1.5
> > > meg 1/2 watt resistor. This is the soft start resistor. It may be open
> > > or something is loading down the input of U4104(4)
> > >
> > > Dennis Viereck
> > >
> > > Richard Golden wrote:
> > >
> > > > CTC187BD2 d.o.a checked common known problems
> > > > with this chassic everything checks good ohms check
> > > > etc. replaced cr4106 cr4107,fuse good ,hot qood
> > > > Q4101( C) +5.99v,Q4301=(C)=0v, U3201 0v on all,
> > > > r4104 =+165v Q4303=0v, ( regulator #1=+1.5v,
> > > > 2&3=0v), (r4128= -2v ), U4101 pins (1=-2v),
> > > > (2=-1.2v), (3=0),(
> > > > 4=0),(5=+1.5v),(6=+1.5v),7=+.019v),
> > > > (8=0v), (9=0v), (10=0v), (11&12 =+163v)
> > > > any help appreciated
> > > > > Richard
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > =====
> > > > > Richard Golden
> > > > > Golden Video Repair Center
> > > > > 1214 e. 6th street
> > > > > ontario ca. 91764
> > > > > (909)988-3356
> > > > >
> > > > > reldong@xxxxxxxxx
> > > > >
> > > > > __________________________________________________
> > > >
> > > > =====
> > > > Richard Golden
> > > > Golden Video Repair Center
> > > > 1214 e. 6th street
> > > > ontario ca. 91764
> > > > (909)988-3356
> > > >
> > > > reldong@xxxxxxxxx
> > > >
> > > > __________________________________________________
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