Knockout
Bally, 1975I have a 1975 Knockout pinball machine, and all of the lights behind the backglass recently quit working. Both scoring mechanisms still work. I checked the two main connections, and they are good. Any advice would be greatly appreciated. Thanks
Quoted from LTG:A schematic would help. Figure out where they get power from, and what leaf blade switch is open and why.
LTG : )
https://www.ipdb.org/files/1392/Bally_1975_Knockout_Schematic_Diagram_continuous.pdf
shows a white page in my browser but if I "download & open with a PDF viewer it shows up
is it "general illumination (panel) "
Knockout backboax lights (resized).jpgCurrent should flow through the red circuit below if the Lock Relay switch (shown as open on the schematic) is closed. The fuse needs to be good, and the wiring connecting everything has to be good. The wire colors on the schematic will tell you which switch to check on the Lock Relay. If there is a Jones plug or 2 connecting the backbox to the bottom board, re-seat them first to see if those connections are good.
pinside.10be9e381a4e172c875715e5f62ac4b2efd1853a (resized).jpgQuoted from Mwn74:Any advice?
Check what he was good enough to high lite in yellow.
Pull and check fuse with a meter.
Check leaf blade switch on lock relay. Are the contacts clean ? Does the lock relay pull in and close them ?
LTG : )
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Hopkins, MN
's-heer Hendrikskinderen