Can you measure resistance on primary and/or secondary of HV transformers? Depending on wiring, you may need to disconnect the primary on the suspect to measure. On the secondary is the tube, which will look like an open circuit if the voltage is off.
Is there any kind of visible label on the transformer? Is that what's under the white covers?
I don't understand:
Primary (non disconnected) 68 Ohms on both
Secondary (disconnected) 148 Ohms on both
??
Same values but only one works ?
I have to disconnect primary on both to be sure but my wife wants to go to Sushi bar, so next tomorrow ;-(
Sushi more fun that this.
Looks as though the transformers are good. That very good. Xfmrs are hard to replace.
Secondary only has the tube on it and we know that works. Good.
How is the primary driven? There must be a triac between the main (120VAC from wall) and the load (primary of xfmrs). Do you see something like this?
I definitively need to disconnect primary, they are connect in parallel !!
"They" being both the xfmrs?
How many wires coming and going from these transformers? I assumed 2 for primary and 2 for secondary. I just want to make sure they didn't do something tricky. Based on the 120VAC on the primary, I doubt it.
Do you know what a triac looks like? Do you see any there?
Are the HV transformers under the white case? Can you remove the top to see inside. Looks like you have control wiring running into the case.
Good morning
No information on HT transformer, no way to open it
I unsoldered them, same value on primary or secondary, 450K Primary, 148 Ohms secondary
I think there is a capacitor inside because if I wait with my fluke, value increase slowly.
I draw a schematic:
there are three TO220 type, one on radiator, both without dissipator still have value but I'm unable to read something without desoldering.
I don't see any connection between these TO220 and primary circuit for HT
there are also these component plugged in parallel, one on Power input, one one Timer input.
I don't know what it it ? A big resistor 1.2 KOhms ?
I think both primary are still energized to stay warm and ready. the red and black wires control the secondary and allow the variation of the power for the lamp.
When I turn the head on, both primary are powered by 110v.
I guess the TO220, triac or transistor, only controls the red, black circuit ?
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Dajaab, Given that there are six wires to the transformer, then I wouldn't expect the triacs. You are right that you have a primary, a secondary, and a control. winding. What is the resistance on the control (red/black) winding? My guess is your transformer is some form of a saturable core reactor. The current in the red/black would control saturation of the transformer, thus changing its impedance controlling current to the load. These were used in the ZVI Cold light Stabilizer.
Could we get some more close pix of the circuit board, much like that partial above?
I'll do all I can at distance to help. More fun than the paperwork staring me in the face.
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