I will E-mail you the power supply as a pdf file to your E-mail address tonight. Dennis "Richard Golden d.b.a. Golden Video Repair Center" wrote: > 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 > > > > > > > > > > __________________________________________________ > > > > > Do You Yahoo!? > > > > > Send FREE video emails in Yahoo! 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