[TechAssist] Re: RCA CTC185AB Dead F25216WT may 1996
- From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 04 Nov 2002 15:08:56 +0000
Mine had indications of a shorted cpu loading down the start voltage(7.6V
down to 4.8 v on pin 20 with C3126 ok and all glue removed so I gave an
estimate with that in mind and consitat with the possibilty of a eeprom
realign too). I haven't seen a bad eeprom on a 185 yet either but I was
leary of replacing on the 185 chassis after reading several post on eeproms
on tha chassis having individual tunner setting requiring complete
realignment of the tunner settings when the data was unrecoverable.
Peter Oliver
Tucson Radio
From: "Electric Medic" <info@xxxxxxxxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: <techassist@xxxxxxxxxxxxx>
Subject: [TechAssist] Re: RCA CTC185AB Dead F25216WT may 1996
Date: Sun, 3 Nov 2002 21:41:12 -0500
Hollis and All:
Do you see many CTC185's with bad eeproms? I see them bad all the time on
CTC175's thru CTC187's because of the tuner wrap problems. I might have
missed diagnosed some CTC185's because I don't think I have ever seen a bad
one on those. Most of the time they have power supply problems, however, I
have not fixed every one, but most. You would think the eeproms would fail
in those just like on the other TCE chassis, I just thought they didn't
because of the different tuner design. That is a good tip, I need to keep
the eeprom in mind on the CTC185. Thanks.
Perry Bower
Electric Medic
http://www.electricmedic.com
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-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of HSWAD@xxxxxxx
Sent: Sunday, November 03, 2002 5:58 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: RCA CTC185AB Dead F25216WT may 1996
I guerss you didn't read my suggestion. I just fixed three of these by
changing the eeprom. Hollis Bates, field engineer-retired
In a message dated 11/3/2002
9:46:18 AM Eastern Standard Time, oliver_peter1@xxxxxxxxxxx writes:
>
>
>
> Thanks everyone for the tips Unfortunatly this item has exceeded the
> cutomer
> cost threshold at est $130.
>
> Peter Oliver
> Tucson Radio TV
>
>
>
> From: "Mouton's Electronics" <moutons@xxxxxxxxxxxxxxxx>
> Reply-To: techassist@xxxxxxxxxxxxx
> To: <techassist@xxxxxxxxxxxxx>
> Subject: [TechAssist] Re: RCA CTC185AB Dead F25216WT may 1996
> Date: Mon, 28 Oct 2002 09:24:09 -0600
>
>
> I have had a similar problem and found more than 5 or 6 times it was in
the
> reset circuit. Check Q3101 (base), it is a surface mount near the Micro
> (collector connects to pin 2 of the micro through R3120 surfacemount). If
> is
> has any base voltage the likely cause is C3126 surfacemount (base voltage
> should be 0). Remove the capacitor and clean the glue under it also
replace
> the capacitor. It always checks good but you should put a new one anyway.
>
> Hope this helps
>
> Jason Mouton
> Mouton's Electronics
> 1116 Center St.
> New Iberia, LA 70560
> 337-364-1641 Phone/Fax
> moutons@xxxxxxxxxxxxxxxx
>
>
> ----- Original Message -----
> From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Sunday, October 27, 2002 5:54 PM
> Subject: [TechAssist] Re: RCA CTC185AB Dead F25216WT may 1996
>
>
> >
> > I need to look Didn't note that check point on my way out the door
> > yesterday, today I'm not at work. There are no FBT dervied voltages
since
> > there is no oscilation. Only B+ derived.
> >
> > Peter Oliver
> > Tucson Radio TV
> >
> >
> >
> >
> >
> >
> > From: "al m" <ampm@xxxxxxx>
> > Reply-To: techassist@xxxxxxxxxxxxx
> > To: <techassist@xxxxxxxxxxxxx>
> > Subject: [TechAssist] Re: RCA CTC185AB Dead F25216WT may 1996
> > Date: Sun, 27 Oct 2002 12:46:15 -0500
> >
> >
> > do you have your 7.5v on pin 20 of U1001
> > al marquardt
> > ampm@xxxxxxx
> >
> >
> > ----- Original Message -----
> > From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Sunday, October 27, 2002 9:51 AM
> > Subject: [TechAssist] Re: RCA CTC185AB Dead F25216WT may 1996
> >
> >
> > >
> > > The 5V supply is present at the front buttons.
> > >
> > > Peter Oliver
> > > Tucson Radio TV
> > >
> > >
> > >
> > > From: "al m" <ampm@xxxxxxx>
> > > Reply-To: techassist@xxxxxxxxxxxxx
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Subject: [TechAssist] Re: RCA CTC185AB Dead F25216WT may 1996
> > > Date: Sun, 27 Oct 2002 08:13:58 -0500
> > >
> > >
> > > You don't mention the 5V supply anywhere. Do you have a scat?
> > > al marquardt
> > > ampm@xxxxxxx
> > >
> > >
> > > ----- Original Message -----
> > > From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Saturday, October 26, 2002 5:34 PM
> > > Subject: [TechAssist] RCA CTC185AB Dead F25216WT may 1996
> > >
> > >
> > > >
> > > >
> > > > RCA model F25216WT
> > > > Chassis ctc185AB
> > > > MFD May 1996
> > > > Symptom DEAD no flux at plug in no attempt to start or turn on
> > > >
> > > > Has voltage
> > > > Q4114 D=165V, S=162V, G= 135V
> > > >
> > > > Q4401 H.O.T Collector = 162V
> > > >
> > > > U4107 (12V reg) pin 1 (in)= 27V pin 3 (out)=11.9
> > > > CR4110 cathode= 27.8V
> > > > saw tip for CR4704 replaced no change.
> > > >
> > > > The regulator and H.O.T. test normal in circut this set still has
> the
> > > > electoltic in regulator circurt.. I have the regulator KIT but it
> > doesn't
> > > > have all the symptoms, ie usually the regulator blows. The
customer
> > said
> > > it
> > > > just stopped working.. Any ideas
> > > >
> > > >
> > > > Peter Oliver
> > > > Tucson Radio TV
> > > >
> > > >
> > > >
> > > >
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