Xenon
Bally, 1980My Xenon top saucer quit working. Will not fire on a solenoid test either. I swapped in another known working solenoid driver board, replaced the saucer/coil assembly with another and still won't fire. It shows 43VDC at the yellow wires. All other coils fire fine. Solenoid driver board connectors were re-pinned. Need to deliver this working to Pinfest, any help would be appreciated!
Quoted from EEE:Does that machine have a solenoid expander board under the playfield?
No it does not.
It seems like the signal to close the loop is not getting through. Maybe the mpu controlled return/grounding wire (I think its black with red?) One of the J5 connections on the sdb pin 7(?)
Can you swap in a different mpu, maybe an Alltek or nvram version?
Quoted from EEE:It seems like the signal to close the loop is not getting through. Maybe the mpu controlled return/grounding wire? One of the J5 connections on the sdb pin 7(?)
Can you swap in a different mpu, maybe an Alltek or nvram version?
I re-pinned the SDB J5 pin 7, that's where I checked continuity. I have an Alltek MPU and can install it but I'm thinking perhaps a connector pin off the MPU. I'll install the Alltek to be sure.
Quoted from EEE:Maybe a stupid question. Is the solenoid itself wired properly?
Yes. Yellow wires to the banded diode side of the coil. Believe me I've f@@ked that up before!
Looks like the top saucer is a direct signal from the MPU and does not go through the decoder on the SDB. Check continuity from MPU J4 pin 5 to SDB J4 pin 11. You need to test from the back of the MPU to the back of the SDB to verify the pin inside the connectors are good. The easiest way is to take a row of header pins and plug one into each connector, then check end to end via the header pins.
Actually, if you haven't repinned both of those connectors I would go ahead and do that. MPU J4 is especially susceptible to corrosion.
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Port Matilda, PA