[TechAssist] Re: RCA CTC185AB Dead F25216WT may 1996
- From: "Electric Medic" <info@xxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- 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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