(Topic ID: 216801)

stern SS player 3 odd display problem


By creepykenny

1 year ago



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  • 8 posts
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  • Latest reply 1 year ago by creepykenny
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    WildFyre_SwitchMatrix.jpg

    #1 1 year ago

    stern wildfyre 6 digit display issues .....
    this one is giving me headaches, the 6 digit display at player 3 location (and only at player 3 ) is "ghosting" the credits / player info of the 5th display
    i.e. current 39 credits are appearing on flicking display three at same time as flashing on display 5, i have swapped the displays around and problem is only at location of player three, also ran a jumper from the mpu J1 pin 22 to display three pin 15 bypassing the original wire going with no change, displays are known good, header pins have been reflowed and all work perfectly in every location except position for player three
    swapped mpu with a known good Alltek - no change so its not the mpu, ghosting problem still exists at player three
    connectors appear good, no visible break in wiring are seen
    an additional wrench in this mix is that two controlled playfield lamps also are oddly flickering in sync with display strobing, which is some how making me think there is some very strange wiring issue afoot, and there has been alot of wiring repair work done on this one due to mouse modifications

    how to sort this out ?

    open to any ideas and all suggestions, hopefully this makes some sense

    #2 1 year ago

    want to add that this is not an actual display problem, only a problem with what is being displayed .... doh

    #3 1 year ago
    Quoted from creepykenny:

    an additional wrench in this mix is that two controlled playfield lamps also are oddly flickering in sync with display strobing, which is some how making me think there is some very strange wiring issue afoot, and there has been alot of wiring repair work done on this one due to mouse modifications

    The signals on the MPU board that are used to select displays are also used to select lamps and drive the playfield switch strobe signals.

    Disconnect J2 (playfield switch harness) and J3 (cabinet switch harness) from the MPU board and also J4 from the lamp board.

    If the player 3 display behaves correctly after powering on, then power off and plug in one of these disconnected connectors at a time to locate which subsystem is causing the issue.

    BTW if you disconnect the credit/match display, does it make any difference to player display 3 ?

    #4 1 year ago

    really great advice, using your ideas i narrowed it down to a problem with J2 at the mpu, when 4/J2 is unplugged all displays work perfectly, so i will now remove the wires one at a time from that connector to find the culprit

    yeah, i previously tried disconnecting the credit/match display with no change to display player 3

    #5 1 year ago

    The player 3 display select signal also comes out on MPU J2 pin 3 to the switches. The playfield switch schematic says it's a white-blue wire that is the switch Strobe #2 signal.

    If you reconnect all connectors, remove the ball and raise all drop targets, does switch test mode report any closed switches?

    #6 1 year ago

    i checked for switch errors and there are none and all switches register correctly, surprising to me since this one arrived not working and i am raising it from the dead

    will check out pin three

    #7 1 year ago

    Do any of the switches on strobe #2 work?
    .
    WildFyre_SwitchMatrix.jpg

    #8 1 year ago

    FIXED!

    well, its definitely in this row, and for some reason even with with w-blu wire disconnected 4-J2 pin 3 switch the saucer 1 switch still works

    hmmm, this is it, a closer inspection of switch at saucer 1 reveals that the bare GI wire is touching & shorting the return line - this wire runs under the three upper saucer switches making it near impossible to see
    corrected by bending the tab away from bare wire, place bit of electrical tape on the bare wire and now all is good!

    thanks Quench for the help

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