Both sets of optos on my Demo man aren't working. Theres one in the underground and one at the top of the PF for the multi-ball/extra ball shot. Both quit working. I have checked all connections, the LED on the opto board is lit, checked all connections in the backbox, every wire, etc. What do I do now??

Also it is saying the magnet is broken in the claw. Are these things connected or is this a separate problem?

How do I measure power?? What should It read?? can you be more specific??

Everything else seems to be working just fine.

Just lost power. Game worked fine. They both went at once. When playing if the ball goes in one after a ffew seconds the machine searches for the ball and they kick out like theyre supposed to.

No this is a new problem that just started. Sorry if I offended you.

Checked every connection I can think to check all is good. What do I do now???

There is a small board under the PF im pretty sure is the opto board. It has an LED light on it which is on. All connections on it are good as well. Im stumped. the optos stopped working then worked for a few months then stopped again.

It all looks good.

Sorry it looks good. Optos don't work.

What are the IR LEDs???

Tightened up all connections and it has been working fine. Today none of the optos work at all. None of them. Has to be a bad connection??

Bump

Seems like since it works for awhile then stops its got to be a bad connection?? It couldn't be a bad capacitor could it?? Worked fine for quite some time.

The opto board looks ok. Took it off cleaned it checked all connections. What should I do now?

How do I measure the capacitor on this board???

When mine quit working NONE of the optos work. theres one for the crane, 1 for the underground, 1 for multi/extra ball and 1 in the ball trough. they all go out together.

Please talk me through testing. Im new to the power /testing part. Where to put the leads, what setting. game on or off etc!!! Pic of my meterP4270252.JPG

Set the meter to 10 v then put the red on it?? Game off or on when I do this?

Thanks. Will do later today and post results!

Went to test and the optos work perfectly. This is maddening!!

I tested the capacitor when the optos were working looks like around 12v DC. later the optos all quit working I measured the capacitor again and got 0. If there was a bad connection would it cut all power to the capacitor?

Also the sound quit working. Everything is connected. Did I short something?

Looks like about 12-14 DC coming in however the capacitor is showing 12 now also.

Yes everything is working as of right now.

Any idea on the sound?? When I turn it on it does the ping but then nothing.

OH DAMN!!! it looks like Judge Dredd has the same board??? Can I switch them to rule this part out??

Right. Ill switch tonight. Just got JD I usually swap with Dirty harry. they use different boards.

What is a sound board interface error??

Switched boards. Exact same problem JD works fine. This board is fine. What next?

The board from JD is still in DM. No optos however there is 12v going into the board and 12v going through the capacitor.

I get that but they are all not working. There are four sets of optos and they all either work or don't work at the same time.

Im going to visually check all connections again.

I think Ive given up.

Which emitters and transistors?? Looks like the trough opto would be the first one if they are daisy chained.

Don't know about the chase cars but yes when they are all not working the trough opto doesn't work either.

What board should I check?

This is making me nuts. They quit working again a few weeks ago.