Bumpers failed on Taxi

Cachorrito

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I have a Taxi (Marilyn) game and the bumpers have suddenly failed. The lamps are lit, but the solenoids are not responding to the ball when it touches them. All three bumpers failed at once, so I don't think it's a coil issue. The schematics I have for the game are somewhat vague as to where the problem might be, so I'm wondering if there's somethinig downwind from the bumpers that needs to be replaced? Any suggestions?

Thanks,

Rob
 
Did you check the drive transistors for the coils? See section 3b in Marvins Repair Guides (Repairing Williams System 11 Pinball
1986 to 1990)

Could be the bridge rectifier possibly..you'll have to run through the repair guide I'd say....that's what I do anyhow..
http://www.pinrepair.com/sys11/index1.htm#trans

From the guide:

A Coil just Does Not Work - What is Wrong?
Driver transistors can go "open" too. This means all the logic prior to the open transistor could be working fine, but the coil will not energize. If there is power at the coil, this is something to consider (but first see the test procedures below to make sure the coil itself is actually OK). Also if in the past a TIP transistor on the CPU board shorted and burned, sometimes board traces can break. This will also prevent a coil from firing.

Another consideration are the CPU board connectors. On the special solenoids in particular, the male header pins on the CPU board that connect the switches to the CPU, and which connect the CPU back to the coil, can have cracked solder joints. Often resoldering these male connector pins on the CPU board can fix non-working coil problems.
 
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Here's some more info: the voltage coming out of the F1 fuse is +40, which should be only +25. Could this be a bad voltage regulator? Or would we expect the voltage exiting the fuse to be a little high? Could the raised voltage have burned out the coils are about the same time?
 
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