(Topic ID: 292428)

Right flipper not working

By ravve

3 years ago



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  • 5 posts
  • 3 Pinsiders participating
  • Latest reply 3 years ago by ravve
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#1 3 years ago

My right flipper stopped working on Who Dunnit.
It still works to make menu choices with the right flipper button, but the flipper itself dont work.

I checked the opto for the right flipper (i.e. connected to the right flipper button), cleaned it and adjusted the button itself since it was not pressing out the opto switch enough, if compared to the left button´s opto switch.
Also checked fuses on the flipper board, one was burnt and I replaced it, but it was for the upper right flipper which isn´t used in this game anyway. I dont think there are more fuses that can be causing my issue?

Checked continuety from both the opto switch and the EOS switch, to their corresponding places on the flipper board.
All checked OK.

Fired up the game and now I get an error message to check F1, right EOS switch. I dind´t get an error message before, even when it was not working.

In the test menu, the right button is NOT registering when it is pressed.

How should I continue troubleshooting? It has to be the button I should focus on (opto switch) rather than the flipper EOS switch, although the error message states that the EOS switch is failing. Right?

I notices that on the flipper solenoid, both diodes seem shorted. But if comparing to the left flipper, the same thing is seen there. This means that there is continuety between J907-1 and J902-13 as well. Before digging deeper into that (could be that I tested the wrong way), I think that this is not where my issue lies since the button itself is not registering. Or could a bad diode on the flipper solenoid cause the button to not register in the test menu?
Could my issue be related to a bad drive transistor (Q4/Q11)?

#2 3 years ago

Start with swapping the flipper button opto boards between left and right sides to prove you have an opto issue. Highly likely as the transmitter opto is always on when the game is on. They do not last forever.

The U shaped opto pair in WPC95 normally has 5 pins on these boards, so be sure to order the correct one.

#3 3 years ago

Thanks for that quick reply!
I swapped the opto boards and the error did not follow with the opto board, so now I know that the error is not in the opto.

I went into the switch test menu and noticed that the right flipper eos switch is not triggering.
So now I have both the eos switch not triggering , and the flipper button not registering when pressed. Probably these are related?

On the eos switch there are 2 cables, one that goes to the fliptronics board and the other to the cpu board (if I interpret the manual correct).

Continuety to the fliptronics board is ok, however it seems that I have no continuety to the cpu board.
I am trying to follow the switch matrix to find the cable culpruit for the one going to cpu board, but it seems that maybe i am doing somethibg wrong. Or am I on right track? Is there a better way to troubleshoot from here?

#4 3 years ago
Quoted from ravve:

I swapped the opto boards and the error did not follow with the opto board, so now I know that the error is not in the opto.

Great, you may also want to make sure your 12 on the flipper opto board is good.

Quoted from ravve:

I went into the switch test menu and noticed that the right flipper eos switch is not triggering.
So now I have both the eos switch not triggering , and the flipper button not registering when pressed. Probably these are related?

The EOS switches wont cause the flipper to not work nor will they cause the game to not function; you will want to fix them but ignore them for now.

Quoted from ravve:

On the eos switch there are 2 cables, one that goes to the fliptronics board and the other to the cpu board (if I interpret the manual correct).

Incorrect, these are simple direct ground switches (through the flipper boards photometer), the wires on the EOS switches go directly to the fliptronics board.

Quoted from ravve:

Continuity to the fliptronics board is ok, however it seems that I have no continuity to the cpu board.

There is no direct connection from theses switches to the CPU, these closures are processed on the fliptronics board and sent across shared data lines to the CPU via the grey ribbon cable.

I would pull the ribbon cable off and reseat it. Pay close attention to how it goes on as these are very easy to get off a row and will cause you all kinds of issues. This single action may fix everything.

The function of the EOS switches are explained on page 1-47 of the manual. And the theory of operation is on page 3-14.
The flipper cabinet switches and operational theory is explained on page 3-15.

Simple test to determine if the problem is wiring or processing.
1) Remove J905 from the Fliptronics board.
2) While in switch edge test, use a wire jumper to apply a ground to pins 1, 2, 3, and 5 on the J905 header; it doesn't matter if you use the ground at J905-6 or another ground point. If the switches close, the problem is playfield wiring; if not the problem is communications to the CPU (ribbon cable), the CPU board itself, or the flipronics board
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This EOS switch testing is similar, you just remove J906 instead and ground pins 1, 3, 4, and 5 on the J906 header.
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Good Luck

#5 3 years ago

Great info, thanks a lot!
Problem is now solved, it was the flat cable that goes from the fliptronics board. I reaseated it and problem vanished

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