High Voltage

[Bradley]

I have a circuit i pulled from a scanner which contains 4 high voltage output pins. 2 of these pins are actually from 2 small flyback HV drivers.

DC-600v 10uA
DC-1700v 20uA
DC-2250v 15uA--Flyback
DC-200v 5uA--Flyback

I cant seem to determine which pins are my input pins on the circuit... :

 

[Harald Kapp]

Welcome to electronicspoint.

Power is probably supplied by the connector next to the UL logo where the PCB is labelled DC 5V.

 

[Bradley]

Thank you

I know its the 14 pin terminal, but unsure as to which wires i need to run my DC 24V. Right above the DC 5V its also label DC 24V, put its not specific as as to where these are located on the connector. I've followed some of the circuit and found the ground terminal and a terminal that starts with a 35V Cap, but i get no HV output readings. Its got me stumped... Ive tried running a low votage through the circuit backwards to maybe determine some pins but the readings fluctuated too much.

Any suggestions?

 

[mofy]

Look for the filter caps. They would tend to place some local to the board.

 

[Bradley]

Look for the filter caps. They would tend to place some local to the board.

The only filter cap I could find is a 35v cap in the top picture on the bottom left of the board, I've ran my voltage to the pins that run to the cap but I get nothing, the scanner worked when it was brutaly gutted lol the board says DC 5v and DC 24v. I'm starting at DC 9v trying to avoid frying the cirtcuit. Do you think I need 24v to even get the circuit started or should it work on 9v but just with lower output voltage on my HV terminals? Also I don't know what kind of amperage rating I should shoot for on my inputs?

 

[mofy]

There are a lot of wires to the connector so it is possible that more than a simple voltage supply is needed to get it working. I would expect an enable signal would be necessary plus possibly others.

 

[davenn]

There are a lot of wires to the connector so it is possible that more than a simple voltage supply is needed to get it working. I would expect an enable signal would be necessary plus possibly others.

yup agreed, including a brightness control line

Bradley, what you are trying to do is probably not impossible, but without circuit info it will be VERY difficult

 

[Bradley]

yup agreed, including a brightness control line

Bradley, what you are trying to do is probably not impossible, but without circuit info it will be VERY difficult

There are a lot of wires to the connector so it is possible that more than a simple voltage supply is needed to get it working. I would expect an enable signal would be necessary plus possibly others.

Turns out each output needs its own enable signal with the input signals, I've gotten a reading from 1 HV output but have yet to find my 2 fly-back enable pins, I'm assuming that each HV output needs to be enabled separately from each other. Gonna keep trying so well see what happens!

Thank you!!

 

[Bradley]

yup agreed, including a brightness control line

Bradley, what you are trying to do is probably not impossible, but without circuit info it will be VERY difficult

A brightness control line? for adjusting wave forms?