[TechAssist] Re: CTC 187BD2 dead
- From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 7 Jan 2002 07:41:41 -0600
Richard:
Although the SAMS is a Little cheaper, the TCE CD for the ENTIRE ctc186/187
series is available for about $35.
Also, the ctc177 should be close enough, in most cases, to help you on this,
so, if you have one...
Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Penacola, Fl. 32506-3310
850-456-5995 voice
850-458-6369 fax
Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com
----- Original Message -----
From: "Richard Golden d.b.a. Golden Video Repair Center" <reldong@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, January 07, 2002 1:23 AM
Subject: [TechAssist] Re: CTC 187BD2 dead
>
> Thanks Dennis
> Yes it was 1.3 v on pin 4 of u4101 my mistake.I wrote
> it down right but typed it in wrong sorry.
> I'm working without a schematic for this unit,.I will order
> a sams for this unit. You have put me in the right direction thanks. I
was
> trying to repair unit without ordering sams or expensive parts.I only have
> $85.00 to work with on this unit. when I find the fix I will post it.
> thanks.
> 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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