[TechAssist] Re: Advent Model HT3251A (base model# Q3235) Tries to come up but just shuts down
- From: "John at Main TV" <maintv2004@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 25 Mar 2005 17:02:33 -0700
I have the service manual for a HT3251 (not A) and Q3235A in PDF. The first
is 5 meg and the second is 17 meg. Let me know if I can send them to you.
The horiz freq can be 15734 or 31khz to 38khz depending on the signal you
are giving it. I didn't know the HTxxxx and the Qxxxx models were related.
Let me know, John.
John Mielke
Main TV
Longmont,Co 80501
303 776 6955
303 776 0792 fax
maintv2004@xxxxxxxxxxx
www.longmontmaintv.com
----- Original Message -----
From: "Dale Lubow" <harristv50010@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, March 25, 2005 4:35 PM
Subject: [TechAssist] Advent Model HT3251A (base model# Q3235) Tries to come
up but just shuts down
>
> I am working on a Advent Model# HT3251A, Base Model# Q3235. This unit is a
> HDMonitor. When you plug the unit in you have 50V B+ on the Flyback. When
> youpush the power button it rises to about 105V then the HV tries to come
up
> but the Flyback pulse on the collector gets to a distorted 200v p-p, the
> power supply drops a bit and it shuts down. When it tries to come for a
> second or two it sound like the flyback is arching internally or it could
be
> because the pulse is no clean. I disconnected the Horiz. Output collector
> andput a resistor load of about 200 Ohms on the B+ and it will stay about
> 105V.
>
> I took the flyback out and it rang ok. I tried using my Sencore TVA92 to
> drive the flyback and it had less output than I would expect other than
the
> Sencore is a 15KHZ system and I assume this flyback runs at 32KHZ.
>
> Does any one have any idea what might be wrong? Does anyone have a
schematic
> for this unit?
>
> TIA
>
> Dale
>
>
> Dale A. Lubow C.E.T.
> Harris TV &Appliance
> 335 Lincoln Way
> Ames, IA 50010
> 515-232-1109 (Voice)
> 515-232-3356 (Fax)
> HarrisTV50010@xxxxxxx[1]
>
>
>
> --- Links ---
> 1 mailto:HarrisTV50010@xxxxxxx
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