Bally AS-2518-54 Flash Gordon blows F2

(Topic ID: 206044)

Bally AS-2518-54 Flash Gordon blows F2


By Madmax541

1 year ago



Topic Stats

  • 16 posts
  • 7 Pinsiders participating
  • Latest reply 1 year ago by Madmax541
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    There have been 6 images uploaded to this topic. (View topic image gallery).

    Bally_AS-2518-54_Power_Supply_schematic_1 (resized).jpg
    Pin_numbering (resized).jpg
    HV_In (resized).jpg
    Huh (resized).jpg
    P1020843 (resized).JPG
    P1020844 (resized).JPG

    #1 1 year ago

    Have a Flash Gordon pin putting back together after restoring it

    Issue is F2 Fuse blows when power turned on immediately.
    F2 is high voltage 190 - 230 Volt.
    Disconnected all connectors going to backbox and playfield.

    pics attached of power supply board.

    Looking for ideas

    Cheers

    P1020844 (resized).JPG

    P1020843 (resized).JPG

    #2 1 year ago

    Complete shot in the dark.....

    Bad or Shorted bridge rectifier.

    #3 1 year ago

    diode check CR1-CR4

    #4 1 year ago

    Fuse blows with all outputs disconnected?

    #5 1 year ago

    Also check bottom of board in vicinity of F2 / CR1-CR4 for solder bridges, etc.
    Also also check that LED for monitoring the HV. The current limiting resistor for him (150K or brown, green, yellow, gold) shows signs of rework.

    #6 1 year ago
    Quoted from barakandl:

    diode check CR1-CR4

    Checked CR1-CR4 all measured @0.6.
    Measured all bridge rectifiers @0.5.

    Quoted from cody_chunn:

    Fuse blows with all outputs disconnected?

    All outputs disconnected and F2 blows at power up.

    Quoted from G-P-E:

    Also check bottom of board in vicinity of F2 / CR1-CR4 for solder bridges, etc.
    Also also check that LED for monitoring the HV. The current limiting resistor for him (150K or brown, green, yellow, gold) shows signs of rework.

    Looked for solder bridges, found none. Measured Current limiting resistor measured 155K within tolerance.

    Ideas?

    #7 1 year ago

    Does J4 say "Backbox"? Transformer? What brand board is that?

    #8 1 year ago

    Power Board pictured missing left anchor screw. Grounding?

    #9 1 year ago
    Quoted from cody_chunn:

    Does J4 say "Backbox"? Transformer? What brand board is that?

    J4 is backbox, feed by small transformer
    No name of manufacture

    #10 1 year ago

    I'm trying to make some sense out of what is connected to J4.
    All inputs from transformers are supposed to be J5 and J6. J4 is your *output* from the rectifier board to the back box. There should be no direct transformer connections of any kind to J4. Closest thing you have of a direct connection is through F5 from your GI power.... and that is sourced by pins 1 and 4 of J5.

    #11 1 year ago

    Second image is your HV input to the circuit that uses F2.
    First image is -what-?
    Also double check your GI wiring to J5. Pins 1 and 4 should be yellow, pins 7 and 8 should be yellow with black stripe. But that first image almost looks like a yellow/black to pin 4.

    Huh (resized).jpg
    HV_In (resized).jpg

    #12 1 year ago

    On J5 how do you determine where pin 1 is and sequence with next row.

    123
    456
    789

    Compared J5 wiring to my Fathom and it's the same.

    #13 1 year ago

    Pin 1 has the plastic stripe on corner of connector... closest to the bottom right and has what looks to be a yellow wire.
    Pin 2 has first red wire
    Pin 3 has second red wire
    Pin 4 has yellow wire... or yellow with black stripe?
    Pin 5 is middle... empty.
    Pin 6 is green
    Pin 7 should be yellow with black stripe
    Pin 8 ... I forgot
    Pin 9 ... I forgot

    In the second photo - pin numbers are like this:
    9 - 6 - 3
    8 - 5 - 2
    7 - 4 - 1

    Can also find pinout at Molex website.
    See below for excerpt which shows wire entry side of both 6-pin and 9-pin plugs.
    Make sure the wire color matches *at both ends*.

    ... also, never assume that was done before was done correctly.

    Pin_numbering (resized).jpg

    #14 1 year ago

    8 should be yellow-black and 9 should be orange.

    Bally_AS-2518-54_Power_Supply_schematic_1 (resized).jpg

    #15 1 year ago

    Thanks guys right on the money. Didn't know the molex pin 1 key. Thanks learned something new today.
    Error of my ways was connecting small transformer to J5 not paying attention to label identifying it going to backbox assumed keying was correct.

    Pin boots up with correct number of flashes 7, target reset, Playfield and displays light as expected.
    Doesn't start a game when set on free play, alltek MPU game selection switch left most digit set to one.
    Fuse under PF was checked and is good

    What else would prevent a game from starting?

    #16 1 year ago

    Solved issue needed to set dip sw #28 to off, turning off credit display.

    Thanks for help

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