[TechAssist] Re: Zenith Z52Z95D8 9-1674 SWEEP 9-1690 CONVERGENCE. update
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 25 Jan 2005 22:46:02 -0500
Thanks for reply Jerry. I replaced this blue IC a year ago. Now it is bad
again. Nothing was moved for convergence and it still looks good. The
original lasted 6 yrs. I'm lost. It might be right. I think I'll try to
replace the -5V regulator and the resistor feeding it ( grasping for
straws ). I will send it back and see how long it lasts.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "Jerome Silverman" <greentron@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, January 25, 2005 8:35 PM
Subject: [TechAssist] Re: Zenith Z52Z95D8 9-1674 SWEEP 9-1690 CONVERGENCE.
update
> 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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