[TinCanAlley]

Originally Posted by Username1

I'm happy your check of the low voltage power supply went well. As long as the 125v is not as high as 140v and your measurement of the 24v regulated showed the same readings on both test instruments, lets go back to tp5. I know there are not many who believe something can be wrong here, but there has to be a reason the drive voltages are so far off. I'm posting 2 more pictures. In the horiz osc, driver, I would like you to measure the voltages of the driver transistor and post them. I believe its q803. I would also like to check the caps attached to the coupling transformer between the driver and HOT.

Also check that 2200 ohm resistor between 124 and 123 is it ok....?
If the emitter voltage of the driver is too high, you'll have to check that 40 ohm resistor in that circuit.

In that picture you posted of the flyback, is it melted or is that some repair made to it ? its not running hot is it?

Sams gives an emitter current for the HOT on that schematic, I think it say 1.8A, if you think its running hot, it may be worth measuring that.... You have to use the 10A DC current scale on your DMM, - to ground + to the emitter. Only if you think its running hot..... or the FB is melted....

The two caps you noted between the coupling transformer are new and were tested before installation (jail bars were there before the replacement).

I think you're looking at the blob of RTV covering the lead so it doesn't arc from the top of the flyback to any metal in its surroundings.

The HOT runs around 81 degrees and cool to the touch (well not cool, but barely registers to the touch as it's no hotter than my fingertips).

I'll pull the horizontal board today and check the values of the cap and resistors noted. If they are okay, I'll put it back and scope the H-OSC transistor.

Gotta catch up on some other duties this morning, but will be back inside the set in a couple of hours.