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Old 11-05-2019, 07:15 PM   #6
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Join Date: Jul 2011
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Default Re: Plasma Height Voltage Divider board

Originally Posted by redwire View Post
I would check the +/-15V rails to the AD202KN
I give some real though if I see problem with the voltage that being reporting in the diagnostics screen

Originally Posted by redwire View Post
AD202KN, in case the PSU brick is the problem. Does it work at low line 105VAC and ripple is not present.
I did check the voltage going to the voltage divider board the voltage was showing 127 volts on volt meter the diagnostics screen was showing 125 volts

If it turns out that the problem is intermittent I will take it back out again do some more of this type of testing on the board again

Originally Posted by redwire View Post
I would expect shielded cable for the voltage-divider board output.
No it is only twisted cable

Originally Posted by redwire View Post
Why does this make the head crash into the plate?
This is a really good question which I need to get an answer for

Originally Posted by redwire View Post
It's not all stepper motors for height control?
The adjustment is done by a stepper motor with a hydraulic push rod ( but I am not sure about how this part works )
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *

These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps

Last edited by sam_sam_sam; 11-05-2019 at 07:36 PM..
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