[TechAssist] Re: RCA G35772AT CTC187CL DEAD/More info
- From: <jhoeme@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 30 Sep 2004 16:58:10 -0500
With 98K to ground you have no shorts. C1622 and C7411 should be ok (I've
never seen an NPO cap fail). If you used an 8 pin DIP socket to install the
IC check it is seated properly. Is there any data/clock pulses present on
pins 5 & 6?
Jerry's TV Service (Since 1978)
840 So. Kansas Ave
Liberal, KS 67901
620-624-4302
jhoeme@xxxxxxxxxxxxx
----- Original Message -----
From: "Larry E" <videotech@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, September 30, 2004 3:54 PM
Subject: [TechAssist] Re: RCA G35772AT CTC187CL DEAD/More info
Jerry, resistance is 98K pin 6 to ground or across R3204, I can`t find C1622
or
C7411
can you advise where they are located? Larry E
Larry Eastman
American TV& Electronics
Crystal River, Fl. 34428
jhoeme@xxxxxxxxxxxxx wrote:
> What is the resistance from pin 6 of U3201 to ground? If you recently did
> a
> resolder in the tuner wrap check for solder bridges. Also check R3204
> (100K), C7411 (10pf NPO), C1622 (22pf NPO)
>
> Jerry's TV Service (Since 1978)
> 840 So. Kansas Ave
> Liberal, KS 67901
> 620-624-4302
> jhoeme@xxxxxxxxxxxxx
>
> ----- Original Message -----
> From: "Larry E" <videotech@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, September 30, 2004 12:21 PM
> Subject: [TechAssist] Re: RCA G35772AT CTC187CL DEAD/More info
>
> Hi Guys, replaced the eprom and still have the same problem, zero volts on
> pin 6,
>
> 4.32 on pin 8&5. Unsoldered pin 54 of U1001 thinking it might have been
> pulling
> it down, no change, Q4105 is supposed to be the 5v standby source? (no
> schematic)
>
> I have ( measured to cold ground) E= 4.77 B= 5.1 C= 11.7 volts. Could
> the
> 4.32
>
> be too low on pins 8 & 5 ? I was told pins 5&6 get the 5 volts from pin 8
> of
> U3201
> so I`m still confused how pin 5 can have 4.32 but pin 6 would be zero if
> the
> source
> is internally from pin 8 even with a new eprom installed, HELP!!! Larry
> E
>
> Larry Eastman
> American TV & Electronics
> Crystal River, Fl. 34428
>
> Larry E wrote:
>
> > Hi Guys, this 187CL is stone dead, no click from relay, HOT is good,
> > have 160 v on collector
> > in standby, resoldered H- driver transformer and the coil, C4107 is
> > good, found a bad
> > C4105 10uf @ 200 replaced it with no change, I need to know if the
> > voltages are correct
> > on U4101 as I don`t have the schematic, they are
> > Pin 1= -40
> > 2= -33
> > 4= 0
> > 5= .9
> > 6= .9
> > 7= .4
> > 8&9 = 0
> > 11&12 = 165 thanks in advance, Larry E
> > Larry Eastman
> > American TV & Electronics
> > Crystal River, Fl. 34428
> >
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