CurtPalme.com Home Theater Forum

barcodude · Joined: 14 Jun 2014 Posts: 169 Location: The Netherlands

Question:

how do i service the 17v trim pod on the main power supply on a barco graphics 801s?
i read some thing about it but no details were to put the voltage meter, and what's the diffrence between the two
17v trimpods in the picture?

Hulio · Joined: 15 Apr 2006 Posts: 469 Location: Belgium

Only the left one in the picture is a trimpot. The one on the right side is the test point. I guess is just the wrong text right there.
Just put the black probe (crocodile) on the metal chassis somewhere, the red one on the test point (pin on the right side) and adjust the potentiometer (left side) for a reading of 17v DC.

barcodude · Joined: 14 Jun 2014 Posts: 169 Location: The Netherlands

Thank's! and do you know why my new power supply has no white block on it? only a metal plate

Hulio · Joined: 15 Apr 2006 Posts: 469 Location: Belgium

No idea. If you mean the big trafo, it should be there on all SMPS's from 800, 801 and 808 series projectors. Yours is missing or you are confusing the board with the SMPS2+G2 board.
Does your projector is functioning properly with this board mounted ?

barcodude · Joined: 14 Jun 2014 Posts: 169 Location: The Netherlands

**Curt Palme** · Posted: Mon Apr 04, 2016 1:43 pm Post subject:

Oops, 12+ years and it's the first time someone has pointed that out! I've linked to it dozens of times over the years. Smile

The 1209 series DOES have a transformer on it, it's under that metal plate, and is blue!

barcodude · Joined: 14 Jun 2014 Posts: 169 Location: The Netherlands

**Curt Palme** · Posted: Mon Apr 04, 2016 4:52 pm Post subject:

If the 762XXX part numbers are the same, you should be able to use it. The 17 volt line or H width control may be out of adjustment..

barcodude · Joined: 14 Jun 2014 Posts: 169 Location: The Netherlands

maybe a stupid question but i got myself a digital multimeter to check the voltage wich setting do i need to use?
DCV,ACV,DCA? and then it has multiple settings on each like 200, 20, 2000m, 200m etc. Embarassed

barcodude · Joined: 14 Jun 2014 Posts: 169 Location: The Netherlands

is it DCV 20 because i'm reading a 17v output?

barcodude · Joined: 14 Jun 2014 Posts: 169 Location: The Netherlands

never mind figured it out i could make out 17.01 on my meter Thumbs Up

**kal** · Posted: Wed Apr 06, 2016 4:42 pm Post subject:

barcodude · Joined: 14 Jun 2014 Posts: 169 Location: The Netherlands

thank's for you're warning, but i looked only at the test point (if it said 17v)of the main power supply, i looked on internet at the right setting on the digital meter and put the black probe on the chassie and the red one on the test point with a internal pattern running with a contrast and brightness on 50 (that's what the service manual said), and it actualy said 15.83,so i tweaked the pod until it said 17.01. I also needed to set the master h width to an acceptable screen size that's it. No more testing for me everything is done with the setup on my pj,

And don't wurry nobody is going to die at curtpalme from stupidity.

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

But, is your meter calibrated? If it's way off, you may have just adjusted the 17 volt rail incorrectly.

Check your meter with a fresh, brand new, never used Eveready alkaline 9 volt battery. It will read between 9.4 and 9.6 volts.

If you're getting a voltage reading in that range, your meter is well enough calibrated to be trustworthy.

Set your meter to the voltage range that covers the voltage you expect to measure. Measuring 150 volts? If you have a 200 volt scale, that'd fit in it so that'd be good.

The scale chosen should max out above the reading you're expecting to take.

Don't get AC and DC voltages mixed up.

Especially don't try to measure an active circuit with voltage in it on the ohms scale.

barcodude · Joined: 14 Jun 2014 Posts: 169 Location: The Netherlands