Quoted from heni1977:
Post a pic of the board in that area. I think you would know if the resistor took to much juice.
I don’t think the resistor’s are bad. But I could be wrong. Only been working on pinball for a few years. So I am still a noob!!
grumpy what is your opinion?
Most of the time the resistors are just dirty, clean with alcohol first. If the resistors look darker in color then the the surrounding ones, they have been overheated from over current and need to be replaced.
Quoted from reconsider59:
Strange thing, I'm wondering if someone can help me figure this out:
— had the right jet bumper lock on a while back; it blew a fuse, burned up the solenoid, blew the tip122, it was a mess.
— replaced the sol, adjusted the leaf switch for the jet, replaced the tip122 at Q73 with a tip102, replaced the fuse at F3; I THOUGHT all was good...
— but now, all of the jets, and the right dock kicker, don't work. if I put in a fresh fuse at F3, it'll lock on the right jet again.
So, it seems that whatever locked on the sol at first still hasn't been fixed. And I'm not sure why these OTHER things aren't working now, either.
What am I missing?
Thanks in advance!
Anytime you replace a driver transistor because it was SHORTED you must replace the predriver and the coil diode, also test the coil for the correct resistance at the same time. If the driver has gone OPEN which is rare, then you just replace the driver.
Now that you just replaced the driver, you need to replace it again as it was stressed for locking on the coil again. The coil diode that needs to be replaced is on the aux power supply.