[TechAssist] Re: CTC 187BD2 FIXED has bow now.
- From: Dennis Viereck <wa6ati@xxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 07 Jan 2002 22:34:06 -0800
I would suspect components in the Pin cushion circuit rather than C4303 in the
horizontal driver circuit. CR4403 should be a suspect or the components in the
Pin output circuit. I'm not sure what your chassis is using for a Pin cushion
modulator, but I think it is on a small vertically mounted CBA.
It is possible that you could have 1 of two different boards. Q4851 is the Pin
cushion output transistor. It is an NPN used on one of the two modules.
The other module uses an PNP for the Pincushion output. It is location Q4802.
If either one of these transistors or associated circuits fail to operate the
width and E/W pincushion will be effected.
Dennnis Viereck
"Richard Golden d.b.a. Golden Video Repair Center" wrote:
> 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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