JM crashing

[Carl Spiby]

I turned Johnny on (as you do) to be greeted with garbage on the DMD and the feature lights all stuck on, some clunking from the solenoids and then I quickly switched it off. On rebooting him, I had no coils except for the diverters, turns out F104 went and not wanting to go alone, took F105 with it for company.

What the hell is going on? Fuses don't usually blow for no reason or become sentient.

Is my JM infected with a virus? Or is it something more down go earth like C5 or the bridge heading south on the PSU?

 

[Spandangler]

Short ribbon connector. Try reseatting it a couple of times

 

[Monkeyboypaul]

TZ had a mental few minutes in February, turned out the CPU wasn't seated quite right. Didn't blow any fuses though.

 

[Poibug]

yup would reseat asic,ribbons and ensure no juice is coming out the batteries

 

[Carl Spiby]

No batteries to worry about.

Its only done it twice since I've had it but this time it blew the fuses.

Genuinely interested how a crummy connection could cause all the coils to fire and blow the fuses? Data corruption from a bad ribbon?

 

[Poibug]

you have ensured all backbox boards screws are tight
seen loose ones cause this a few times
once at an NLP IIRC

 

[pinballmania]

Bad ribbon cable and/or ASIC seating. When CPU works properly solenoids and lAmps are 'blanked' by CPU until it is in control. Non booting CPU coupled with blanking not being applied to driver means all lamps and solenoids free to fire at random = blown fuse. Blanking is a hardware signal, not CPU controlled.