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Gummed-up Ball count unit? Impulse contact not properly gapped on score motor? Set to 3-ball option instead of 5-ball? Good luck! - Sylvain.

Thanks all for the kudos and referral, appreciated. I do fix pinball boards, but typically only with the complete machine here, because there are often issues with connectors, wiring, coils. etc. in the machine itself, that boards replacement would not address at all. I also do not have a...

Make sure the tilt mechs are not closed after transport (ball incline, plumb bob, etc.)...

I would check for any cold solder joints under the MPU connector header J4. Then, also check for any broken or corroded 0.100 pin(s) inside that connector housing. Why? Because: - Solenoids are 'commanded' from MPU through J4 (then through the Solenoid Driver then drive transistors there); - If...

My favorite: In-line drop targets such as in Flash Gordon, Paragon, Fathom, etc.

In addition to a few pinball machines, I love collecting and fixing old top-of-the-line 1935-1939 Canadian tube radios, along with late 1950s-early 1960s top of the line German tube radios. And a few old jukes. Just as pinball machines, all that stuff needs careful and proper repairs now... Fun...

1] How's the top saucer switch gap? Check if vibrations (such as from a pop bumper being activated, or from the palm of your fist gently hitting the playfield near the top saucer with the playfield glass off ) activate that switch with or without a ball in the saucer (check the X advancing...

I was wondering the same thing, then realized the answer is in the game manual on p.59, look at item 08C, e.g. 6/6 ramp captive ball left flashers it appears. The picture clearly indicates the flashers location under the main playfield. Check to ensure the flash lamps sockets/wiring are not...

I had suggested the above D8, D43, D44 check over on MAACA - using the game manual schematics. The other side controlled by that Q22 transistor are flashers - according to the manual p.73: 6 of 6 (U)/cap. (L) Flashers. - Sylvain.

Those diodes on the lamp matrix in Williams pinball games are usually 1N 4004. You can use 1N4004, 1N4006 or 1N4007 as replacement. Where to buy depends on where you are located. www.digikey.ca is great to buy on-line. Note: semiconductors such as diodes and transistors are very sensitive to...

Voltages arriving on the sound board are good, including polarity across C10 & C19. I should have been clearer in my post above, I was looking at the sound board schematics. Connector pin 14 (arriving on + of C10) should be +12V compared to ground (- of C10), and connector pin 13 (- of C19)...

Have you measured the voltage from the now fixed power supply arriving on the A6 sound board? Just in case there is a wiring or connector issue, especially after some repinning took place earlier... On the A6 sound board: - does the LED blinks on the sound board ? - does the sound board have a...

Like Menace, I do not remember ever encountering a diode that is good sometimes and short-circuit other times, in my numerous years of pinball machines and other electronics repairs. Diodes are usually good, or short (and sometimes opened intermittently on Bally Solenoid Driver boards for...

You need a voltmeter/multimeter to check the +5V (and +12 and -12 volts) arriving on the MPU board from the power supply. Having the game manual would also help in showing where to measure on the MPU (a good voltage input to the MPU checkpoint is across each of the two electrolytic capacitors...

Correct. #455 miniature flasher bulbs have a built-in thermal switch inside their globes to open and close when heated/cooled by the filament. They will flash on their own on a steady supply - without any drive transistor or relay necessary. This is why these bulbs are more expensive than #47...

Yep, 28 1/2 inch chromed full ribbed as indicated by Drano. A useful reference here from Steve Young "The Pinball Resource": http://www.pbresource.com/legs.html scroll down in the URL link above to 'Most Popular Applications Chart' -Sylvain.

If grounding the tab of Q24 does nothing, but grounding the one side of the relay coil does light-up the police beacon, then there is a wiring, soldering or connector issue in between the relay and the MPU/driver board you or a tech will need to address. Good luck! - Sylvain.

From the problem description and details, I sense there are multiple completely separate issues in your machine. (Note: The alligator short test does not prove the drive transistor is good) 1- shorting to ground the tab of drive transistor Q24 lights-up the police beacon - wiring is good; there...

This means that the wiring, relay and bulb for the police light are fine. If I recall, the police light does light sporadically during attract, and during multiball (and during solenoid test 04) if all is well. In your case, it appears you have a board issue (Q24 or its driver or upstream on the...

Here's an extract from the game manual - Solenoids table, clarifying which flasher is controlled by what Some flashers are driven directly by a drive transistor, other flashers by a drive transistor then a relay (and usually resistors under the playfield too). Update: Have you tried the...