Arcade Collecting > Pinball
Jokerz! System 11 flipper not working
ed12:
hi
alot of the time the molex plug :cinch-pin-style: will go bad
remove the plug from the board,and inspect the board :header-pin's:
if they are blackend then that is why u are getting the high volt reading's
they will need to be cleaned,i use a rubber to bursinsh them to clean
now to the best of my know that should be roughly 50-odd volt's dc
chk where u are grounding your meter,also is it a digital meter or a anlog >needle-type< ?,
as far as 1 flipper working and the other not,once u have chked the connector and cleaned it ,take a look see at the eos switch
ed
zero_koop:
The connectors look clean, no black. So are you saying that I should be reading 50V at the circuit board pins and 50V across the flipper button? I am not reading the voltage from one side of the switch to ground. I am just taking a reading across the switch.
I am using a DMM.
Remember, this isn't a problem that started intermittently and then failed. This started after I hooked the wires up wrong. So the problem probably isn't because of dirty parts.
zero_koop:
I wanted to add one thing to make sure we are clear. My problem is NOT that the flipper gets stuck in the up position. That was original problem until I tried to fix it and hooked up the wires wrong. Now my problem is that the flipper does not work at all.
Thanks.
ed12:
hi
page 68 show's the flipper routing
1j19 is you flipper ground point
2p8 is there hot side's
so ground to 1j19
hot to 2p8
should read :after-click: about 50vdc
if it is not there chk with ground still on 1j19
go to 5j12. if it is there then have a look see at your eos switch's
ed
zero_koop:
I think I may have narrowed down the problem. So if anyone wants to follow along and help, grab a copy of the schmatics here:
http://mirror2.ipdb.org/files/1308/Williams_1988_Jokerz_Schematics.pdf
On page 84 of the manual (page 88 of the PDF) you see the Power Wiring Diagram. In the lower left corner you see the Left Flipper Circuit. Starting at the top of that diagram there is 5p12 pin 2 (this is on the Aux Power Driver Board which I think is "board 5") which I read on my DMM as 75V. Then I follow the Gry-Yel wire to jumper 2j5 pin 3 which also has 75V (this is on the Backbox Interconnect Board which I think is "board 2"). Going down on the diagram you get to jumper 2j8 pin 8 which reads 0V. So the problem is somewhere around there because if I read the voltage at the same spot for the Right Flipper Circuit I still get the 75V. So, going back to the left circuit, you can see there is a resistor coming off of the main flipper circuit going to the Lane Change Switch. I also get 0V reading at that resistor. I checked the resistor and it is still providing the proper resistance. Moving past the resistor on the diagram you get to a microchip 2u2. I found this on the circuit board and it is a "4N25 ISOCOM I844". My only theory right now is that this chip has gone bad and is causing a short which is drawing all of the power from my flipper solenoid.
Any other theories? Does anyone know how I can test the chip? Does that require removing the chip from the circuit board? If any of that didn't make sense just ask me and I can explain. Thanks.
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