VMAX1200 CDI ignitor unit

[Jak]

I am currently trying to repair my 1990 VMAX1200 and have no spark in one of the plugs. I have located the cause of the problem to be a few burnt resistors in the cdi box. I would like to try replace these resistors before going out and spending 200+ on a new box however I can't seem to find anywhere online what resistor values I need.

Does anyone have a circuit diagram for this specific ignitor unit (TID14-95 3UF-00) or know what resistor values I need?

 

[02GF74]

I can see there a 4 burnt resistors, but not sure what the last photo is showing.

If you have 3 working circuits, then remove resistor from on of them and measure its resistance. You really ought to replace with the same value and voltage type.

A circuit diagram is best but you may be able to read the colour bands (resistor value) from a photo of the same unit.

There would be a reason they got very hot, you may need to test the transistors just next to then, these will have model number in tiny writing on the flat side.

Also it looks like there are aluminium heatsink just below the resistors, I reckon the driver transistors (or triac) are mounted on them and need testing.

BTW this looks like a doube sided board - it shouldn't be that difficutl to follow the tracks to reverse engineer one of the driver circuits - then it should be possible to figure out resistor values.