[TechAssist] Re: Zenith Z52Z95D8 9-1674 SWEEP 9-1690 CONVERGENCE. update
- From: "Jerome Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 25 Jan 2005 20:35:10 -0500
Posts I have seen by people that know more about it than I do say that if
the yoke and magnets are properly adjusted, the convergence ICs dont have to
work very hard, draw less current, and run cooler.
Jerry Silverman
Greentron Inc
4 Newland Ave Greenville SC 29609
Fax/Phone 864 232 3889
greentron@xxxxxxx
----- Original Message -----
From: "Gerald Gann" <alpha21century@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, January 25, 2005 3:49 PM
Subject: [TechAssist] Re: Zenith Z52Z95D8 9-1674 SWEEP 9-1690 CONVERGENCE.
update
> They are the same IC doing the same job. I would think they should run
the same. I could be wrong. In this case they both read close to the same
according to my MINOLTA/LAND CYCIOPS MIMI LASER.
> Jerry
>
> Alpha 21 Electronics
>
> Granite City, IL 62040
>
> Ph. 618-452-8620
> www.alpha21century@xxxxxxxxxxxxx
>
> al m <ampm@xxxxxxx> wrote:
> Thanks Jerry. I had no problem changing the IC's, I think the heat is
coming
> from the -5V regulator. But it might be normal, or are you saying that
both
> IC's on the 9-1960 board should run the same? The insulator on the heat
sink
> is still intact. the -5V regulator is regulating at 5.1V. Maybe I should
> change that.
> Al Marquardt
> ampm@xxxxxxx
> Al Marquardt Electronic Repair
> 206 W Main
> Girardville Pa. 17935
> ----- Original Message -----
> From: "Gerald Gann"
> To:
> Sent: Monday, January 24, 2005 11:14 PM
> Subject: [TechAssist] Re: Zenith Z52Z95D8 9-1674 SWEEP 9-1690 CONVERGENCE.
> update
>
>
> > Al: Just got back from a long weekend and got around to checking
> > email. I had this happen one time. Tech changed the STK's on
convergences
> > board. One was dried on so hard on the heat sink he had to us a small
> > screwdriver and chisel it off the heat sink. In doing so he scared the
> > heat sink and left a burr and he did not notice it happened. This keep
the
> > STK from making good contact the head sink. This caused the STK and heat
> > sink to heat up. This was a recall STK did fail after a few days. After
> > removing the STK and wipeing off the heat sink compound we found the
burr.
> > Took a flat file and filed off the burr. New STK and compound, let play
> > for an hour or so. Checked temperatures both IC's the same. No more
> > recalls. I don't know if this will help or not but stranger things do
> > happen.
> > Jerry
> >
> > Alpha 21 Electronics
> >
> > Granite City, IL 62040
> >
> > Ph. 618-452-8620
> > www.alpha21century@xxxxxxxxxxxxx
> >
> > al m wrote:
> > If someone gets a 9-1690 convergence board in, could you please let me
> > know
> > if the blue convergence heatsink should be running hotter than the red
> > one.
> > Mine is running at 138f deg..
> > Al Marquardt
> > ampm@xxxxxxx
> > Al Marquardt Electronic Repair
> > 206 W Main
> > Girardville Pa. 17935
> > ----- Original Message -----
> > From: "al m"
> > To:
> > Sent: Wednesday, January 19, 2005 4:18 PM
> > Subject: [TechAssist] Re: Zenith Z52Z95D8 9-1674 SWEEP 9-1690
CONVERGENCE.
> > update
> >
> >
> >>
> >> This set the blue convergence was replaced with a STK392-180. The
picture
> >> is
> >> good but the heat sink that the IC is on is measuring 139Fdeg. The red
> >> heat
> >> sink is a lot cooler. I have changed all caps on the board and checked
> >> all
> >> the other components. There is a -5V regulator on this heat sink. The
> >> voltages are all correct on the board. Could this heatsink be running
> >> hotter
> >> than the other one because of the -5V regulator? Could this be normal?
> >> All
> >> the heat seems to come from the -5V regulator. When I measure the temp
on
> >> the IC it is cool but on the regulator it is 138F. Am I chasing a ghost
> >> again with this being normal? Thanks.
> >> Al Marquardt
> >> ampm@xxxxxxx
> >> Al Marquardt Electronic Repair
> >> 206 W Main
> >> Girardville Pa. 17935
> >> ----- Original Message -----
> >> From: "al m"
> >> To: "tech assist"
> >> Sent: Saturday, January 08, 2005 11:44 AM
> >> Subject: [TechAssist] Zenith Z52Z95D8 9-1674 SWEEP 9-1690 CONVERGENCE.
> >>
> >>
> >>> This set had no power. I replaced the B+ diode and the set ran but the
> >>> blue
> >>> convergence was off. Changed the blue convergence IC ( STK392-110 with
> >>> STK392-180). The Ic's are running hot. How hot are these supposed to
> >>> run.
> >>> I
> >>> can keep my finger on it but it is hot. I may have something more
wrong
> >>> with
> >>> the power supply.
> >>> Al Marquardt
> >>> ampm@xxxxxxx
> >>> Al Marquardt Electronic Repair
> >>> 206 W Main
> >>> Girardville Pa. 17935
> >>>
> >>>
> >>>
>
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