[TechAssist] Re: Crosley CC27760 chassis 27E502 - Repeat failure of H.O.T.
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 25 May 2005 09:10:50 -0400
Check C505 first. You should use a good quality replacement for Q502. If it
still fails, then I suspect a bad FBT. See the following:
If an overvoltage condition develops, the collector of Q530 or Pin 5 of
IC530 will go high. This increases the voltage on Horizontal AFT line
causing the Horizontal frequency to increase. This may be caused by the
130V B+ supply reading high or by a defective IFT. If the 130V supply reads
OK, then check the 200V source to the CRT board. If this source is high,
replace the IFT.
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxx
----- Original Message -----
From: "Tel-Tek" <teltek3@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, May 25, 2005 6:19 AM
Subject: [TechAssist] Re: Crosley CC27760 chassis 27E502 - Repeat failure of
H.O.T.
> LeRoy..
> Sound like you covered all the bases. You need to check your Regulator
> circuit for bad caps.
>
> Either you used a poor sub for H/O, or your B+ is going high due to bad
> caps in the Reg. circuit.
>
> This does not apply to Crosley, in particular, but most sets.
> Shorted H/O with no bad solder connection on drive tranformer, usually
> means a trip to the shop.
>
> -Ed-
>
> Ed Gaidies
> Tel-Tek Electronics
> Ontario-Canada
>
> teltek3@xxxxxxxxxxxx
> teltek@xxxxxxxxx
>
>
>
> LeRoy Westlund wrote:
>
> >Hi members,
> >I have the above listed Crosley chassis, that I replaced the (shorted)
> >H.O.T. with a BU2508DF (Generic). It had a 610597 which the new OEM
number
> >is 483513047749. I also replaced C432 (100 @ 200) e-cap., which tested
bad.
> >I also soldered Horz driver txfmr.(Top & Bottom). I replaced F401, and
> >soldered some other questionable connections as needed.
> >
> >I re-assembled the chassis in the home, and it turned on with a beautiful
> >picture. Regulation seemed to be OK, so I made out the bill,...the
customer
> >paid,....and about an hour later, the customer called, and said the set
went
> >dead again. I pulled the chassis again, and the H.O.T was blown again.
> >
> >Do you think my only problem is using the generic H.O.T., in place of the
> >OEM original ? or,...did I miss something, that normally should have been
> >checked, or replaced ? I will order the OEM part,...I just like to know
if I
> >missed something, that is a common problem.
> >
> >TIA,
> >LLW
> >
> >LeRoy Westlund
> >Westlund TV & Electronics
> >97 North Main " I forgot,..to remember,..
> >Centerfield, UT 84622-0087 to forget "
> >Ph./Fax 435-528-3822
> >mailto:LLW@xxxxxxxxxx
> >
> >
>
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