[TechAssist] Re: CTC 187BD2 FIXED has bow now.FIXED
- From: "Richard Golden d.b.a. Golden Video Repair Center" <reldong@xxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 11 Jan 2002 18:22:42 -0800
Thanks CR4403 and C4407 certainly fixed the bow.
thanks Al ,and Dennis. And Everyone for the help.
Richard
----- Original Message -----
From: "al m" <ampm@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, January 08, 2002 7:06 AM
Subject: [TechAssist] Re: CTC 187BD2 FIXED has bow now.
>
> dennis change cr4403 and c4407 the cap is probably bulged.had the same
> problem this fixed it.
> al marquardt
> ampm@xxxxxxx
> ----- Original Message -----
> From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, January 08, 2002 12:34 AM
> Subject: [TechAssist] Re: CTC 187BD2 FIXED has bow now.
>
>
> > 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
> > > > > > >
> > > > > > > __________________________________________________
> > > > > > > Do You Yahoo!?
> > > > > > > Send FREE video emails in Yahoo! Mail!
> > > > > > > http://promo.yahoo.com/videomail/
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- » [TechAssist] Re: CTC 187BD2 FIXED has bow now.FIXED
