Author Topic: HV screw drivers  (Read 1244 times)

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Offline pinball god

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HV screw drivers
« on: December 23, 2008, 10:22:30 PM »
This is more for the video arcade guys I suppose but can apply to Pin2000. Is there a difference between a regular screw driver with an insulated shaft and what I have heard called a High Voltage screw driver?

Was thinking off adjusting the brightness pot on the tube but have been told to use a HV driver. Or is it just a matter of being extra careful and you'll be fine?
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Offline Strangeways

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Re: HV screw drivers
« Reply #1 on: December 23, 2008, 11:43:30 PM »

I've never heard of a HV driver and I've adjusted plenty of brightness pots in my time..

You can buy TV adjustment instruments from Jaycar etc - which are just plastic screwdrivers for adjusting pots and inductors.

Of course - on a standard chassis - You have a brightness pot, and you have a brightness pot on some EHTs.

not sure about a P2000..

The insulated shaft on a standard flat head should be fine - But the set from Jaycar and Dick Smith will do the job.
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Offline MartyJ

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Re: HV screw drivers
« Reply #2 on: December 24, 2008, 09:47:51 AM »
If you go to a decent electrical shop they have insulated screwdrivers (with different ratings) ie 1000v.  I thought these were mainly for sparky's working on live switchboards, powerpoints etc...I've never used one on my video games, but I've read they are used for discharging tubes etc..

Offline pinball god

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Re: HV screw drivers
« Reply #3 on: December 24, 2008, 11:43:28 AM »
I've heard the same about discharging tubes. I've got plenty of insulated screw drivers but they may be a little too large so I'll take a visit to jaycar and check out the range.
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Offline Chuck

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Re: HV screw drivers
« Reply #4 on: December 28, 2008, 12:44:18 PM »
This is more for the video arcade guys I suppose but can apply to Pin2000. Is there a difference between a regular screw driver with an insulated shaft and what I have heard called a High Voltage screw driver?

Was thinking off adjusting the brightness pot on the tube but have been told to use a HV driver. Or is it just a matter of being extra careful and you'll be fine?

Just use a plastic trim pot adjuster.  They are meant for monitor adjustment.  Monitor boards are fairly safe.  Just stay away from the suction cup on the monitor itself and the flyback transformer.

Offline pinball god

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Re: HV screw drivers
« Reply #5 on: December 28, 2008, 10:50:38 PM »
funny you should say that, I was thinking of adjusting the brightness on the flyback pot. Maybe not a wise move huh?
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Marty Machine

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Re: HV screw drivers
« Reply #6 on: January 11, 2009, 05:53:02 PM »
The HV screwdrivers are just next to the left-handed screwdrivers in the shop  !*! hahahaha

Being a TV tech as part of my job for over 2 decades, i can safely say that we've never had an official HV screwdriver or discharger, although plastic/insulated screwdrivers with earthing clipleads have been our main discharge tool for TV tubes.

Be aware that no matter how careful you are adjusting focus pots etc, you can still get a nice buzz from the EHT HV lead, especially leaky ones waiting to bite anything that moves near them.

If you can find solid plastic shaft screwdrivers with either plastic or metal tips, they would be preferable.

MM.




Offline Pinball Fixers

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Re: HV screw drivers
« Reply #7 on: January 30, 2009, 07:40:31 PM »
This is more for the video arcade guys I suppose but can apply to Pin2000. Is there a difference between a regular screw driver with an insulated shaft and what I have heard called a High Voltage screw driver?

Was thinking off adjusting the brightness pot on the tube but have been told to use a HV driver. Or is it just a matter of being extra careful and you'll be fine?

Be careful adjusting the "Screen" Brightness... You don't want it to be too bright, as you are only driving the screen too hard, leading to premature failure. Generally, adjust the screen brightness so the background of the picture is black, and no raster (diagonal lines) showing.

Using plastic tools for adjusting the monitor chassis is best, but generally I don't bother. I've had more than my fair share of zapps over the years, so I suppose I know what I'm in for ^.^
« Last Edit: January 30, 2009, 07:42:21 PM by pinball-fixer »