Bow and Arrow
Bally, 1975What's the purpose of the diodes on Bally EM pop bumpers? I have an EM Bow and Arrow that at least one of the pop bumpers has a diode. I'm assuming that the others were either removed or fell off. Not quite understanding the reasoning behind it. They're not showing up in the schematic either.
Quoted from schudel5:What's the purpose of the diodes on Bally EM pop bumpers? I have an EM Bow and Arrow that at least one of the pop bumpers has a diode. I'm assuming that the others were either removed or fell off. Not quite understanding the reasoning behind it. They're not showing up in the schematic either.
Someone might have replaced the coil at one time with a SS unit, no harm done.
Does the EM Bow and Arrow use DC for bumpers? Then the diode is OK, if you connect the coil in right way. If bumpers are AC operated, then the diode will short every other half cycle and reduce strength until it eventually burns out.
Quoted from gdonovan:Someone might have replaced the coil at one time with a SS unit, no harm done.
Makes sense. I'll look to see if it's been replaced.
Quoted from Tuukka:Does the EM Bow and Arrow use DC for bumpers? Then the diode is OK, if you connect the coil in right way. If bumpers are AC operated, then the diode will short every other half cycle and reduce strength until it eventually burns out.
DC slings and pop bumpers only.
No one seems to have a sure answer on the diodes, this question seems to come up every six months. Some games have them on the schematics, some don't. Some put them on some coils but not others. It might help protect the bridge rectifier, but the bride *is* some diodes so...
Three options:
- leave it as is
- make it match the schematic
- look up the schematics for the last ems bally made any make it match *that* schematic, since maybe they learned a thing or two through the years
Either way, the potential issues that having or not having them can cause are minor, I wouldn't worry about it too much
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