[TechAssist] Re: H. P. Monitor (D5258A)
- From: Gary McCartney <number63@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 04 Jan 2002 23:17:20 -0500
I just finished scrapping out one of these monitors tonight. It wouldn't
start, just heard tick, tick, tick. The HOT was shorted, but I didn't
bother trying to repair it because the CRT had a burn mark right in the
center of it, as if someone tried running it without the yoke connected
(someone had been in there, I could tell).
I am looking at the main board now. It appears as if the B+ comes in to
the flyback on pin 1 through D402, through the winding to pin 2 where it
goes to the HOT collector. If you get 187V on pin 1 and only 5V on pin
2, measure the winding between pin 1 and 2. Of course it is possible I
am wrong and my flyback could be shorted pins 1 to 2. Also check D402 if
that is indeed the B+ line.
note* I also get continuity from pins 3 and 4 to pins 1 and 2 but at
this point, I don't know if that is normal or not.
If you need me to look at anything else on this board or if you need any
parts off it, let me know.
Gary McCartney
McCartney Electronics
7134 Fife Rd, RR 7
Guelph Ontario Canada N1H 6J4
Fax: (519)821-1530
email: number63@xxxxxxxxxxxxx
Shaun wrote:
>
> Hi Techs, I have this Hewlit Packard monitor that tries to come on you can
> hear HV for 2 sec then it shuts down but the on/display light stays on and is
> green not yellow. There is only 3-5 v dc on the horz output but the supply
> voltage from the secondary of the power supply is 187v dc only notes I have
> on this one is replace flyback but i really want to make sure before I tell
> customer its the flk because usually they wont repair. I do not have a print
> so any advice or help would be great.
>
> Thanks
> Shaun
>
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--
Gary McCartney
McCartney Electronics
7134 Fife Rd, RR 7
Guelph Ontario Canada N1H 6J4
Fax: (519)821-1530
email: number63@xxxxxxxxxxxxx
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