[TechAssist] Re: Zenith SE2517P Chassis 9-707 No audio. Need schematic.
- From: gulftech@xxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 4 Mar 2006 10:04:28 -0600
470pF?? Wouldn't be much of a filter.
Kenneth Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL 32563
850-934-8324 (Voice) 850-932-0819 (Fax)
On Sat, 4 Mar 2006 09:54:02 -0500 "Hoyt's TV" <hoytstv@xxxxxxxxxxx>
writes:
> Gerry, in one of the tips they refer to CX3418 and call it a 470pf
> in the other one they cal lit C3418 and call it the filter for the
> 18v rail
>
> I don't believe the tips are written by Zenith tech writers. I think
> they
> are submitted by TV techs in the field.
> I know a lot of TV techs whose spelling accuracy leaves a lot to be
> desired.
> So I tend to think they are one and the same.
>
> Tip also says they are not being biased properly through the diodes
> and
> claims that C3418 filter was leaky.
> I would suspect leaky diodes, myself.
>
> If you would like a schematic, I can scan the relevant parts and
> send them
> if I have it.
>
> Russ Hoyt
> Hoyt's TV
> Exeter, NH
>
>
> ----- Original Message -----
> From: "GERALD GANN" <alpha21century1234@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, March 03, 2006 4:10 PM
> Subject: [TechAssist] Re: Zenith SE2517P Chassis 9-707 No audio.
> Need
> schematic.
>
>
> > Russ are you monitoring this if so can you till me where C3418
> is. We
> > did what the tip said and the audio came back. We found CX3418 an
> 470uf @
> > 50V. Changed that, no help. Why can?t we just leave those diodes
> > disconnected? Audio sounds OK. Thanks
> > Jerry
> > Alpha 21 Electronics
> > 1840 State St.
> > Granite City, IL 62040
> > 618-452-8620
> > alpha21century1234@xxxxxxxxxxxxx
> >
> > Hoyt's TV <hoytstv@xxxxxxxxxxx> wrote: From Z-Tips
> >
> > bad 18v supply rail at pin 2 of IC 101 & 201 on 9-599, scope it
> for ripple
> > lift biasing diodes at pin 2 of each IC, if audio comes back may
> have
> > leaky
> > C3418 filter cap. on 9-520
> >
> >
> > Russ Hoyt
> > Hoyt's TV
> > Exeter, NH
> >
> >
> > ----- Original Message -----
> > From: "GERALD GANN"
> > To:
> > Sent: Saturday, February 25, 2006 5:39 PM
> > Subject: [TechAssist] Zenith SE2517P Chassis 9-707 No audio. Need
> > schematic.
> >
> >
> >> Zenith SE2517P Chassis 9-707 No audio. Need schematic.
> >> Would any one have this oldie in PDF by any chance? Caps checked
> good and
> >> we are getting all the voltages we think we are supposed to get
> on the
> >> Stereo DEC/Audio Amp 9-599.
> >>
> >>
> >> Jerry
> >> Alpha 21 Electronics
> >> 1840 State St.
> >> Granite City, IL 62040
> >> 618-452-8620
> >> alpha21century1234@xxxxxxxxxxxxx
> >>
> >>
> >>
>
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