CFTBL Flipper Problem

[Toxteth O'Grady]

Morning all,

I changed the coils and performed a flipper rebuild on my Creech last week and in my haste forgot to take pictures, subsequently I managed to put a coil on backwards and in doing so wired it up incorrectly.
The machine did not like it and when I turned it on, F901 blew and the machine booted with a completely different sound. I made a video which I will try to post.

Everything is back where it should be now and all wiring to the flipper coils matches photos of machines online but whenever I turn it on F901 blows. Everything else seems to work perfectly.

I suspect something on the fliptronic board has blown but I’m not technical enough to diagnose without help, anyone have any ideas?

 

[Toxteth O'Grady]

Just noticed that F901 is labelled upper left flipper but it’s the right flipper which was wired incorrectly and now is not working.

 

[CHRIS B PINBALLS]

The diode s on the coil will have blown

 

[Pick Holder]

As well as the coil diodes blowing you can bet that the transistors have blown on the fliptronics II board.

Take the fliptronics board out of something like Fish tales and using your multimeter compare readings on ohm range for the TIP transistors (the 4 large ones and the 8 slightly smaller ones).

I would image one or two transistors are shorted.

 

[Toxteth O'Grady]

How do I check the ohm readings, there are 3 pins on each transistor?
Sorry for the stupid questions but I’m still learning the electrical side of these things.

 

[Toxteth O'Grady]

@Pick Holder

 

[Calimori]

Set the multi meter to resistance buzzer. If in the machine, put one lead on earth on and the other touch the metal top of each TIP. If you get any buzzes them they are fried. If any show very different ohms then they might be suspect. I think they are meant to be 0.6 or 0.7 but should all be the same.
I missed this earlier or I would have got you readings from my CFTBL.

 

[Calimori]

Found the full info on pinwiki

TIP122/102: Put the black lead of the DMM on the center lead or on the metal tab of the transistor. Put the red lead of the DMM on each of the two outside legs of the transistor. The DMM should show a reading of .4 to .6 volts. Any other value, and the transistor is bad and will need to be replaced

 

[Toxteth O'Grady]

Problem now sorted and all transistors replaced, machine is working like new. Thanks for all of your help.