Rockola 418 Blowing 28V Fuse - Jukebox-list

23 Sep 2025


      Hi, All:
Praise the good Lord, I might have found it.
Since most folks agreed that the problem had to be that #2 micro 
switch, and given that I have replaced it twice, I pulled out the wiring 
diagram and my erasable color pencils and went to work, starting at the 
common of that #2 switch.  Wowsers.  The blue-red wire from the common 
of that switch goes ALL OVER the set, through, I think, SEVEN plugs and 
6 cables.  I got a little 6v 150 ma test light, hooked it on that common 
pin and chased it one plug at a time.  I believe, when the dust all 
settles, that it was the white, 6 pin cable going from the control box 
to the write-in assy that was the culprit. The male side to the write-in 
chassis where the blue-red wire connects was a little cock-eyed in the 
plug.  That said, I went over every plug that thing passes through, 
cleaned and sprung the male contacts, and put them back together.  I 
also put some more effort into cleaning the contacts on all the relays 
in the control box, got my leaf tools and made sure they all had good 
travel and wiping action.
It has been playing for about 3 hours now.  I think I've run about 60 
selections.
Got a little reminder lesson from a thing my grandfather used to say 
about not fooling with things unnecessarily.  I decided to clean all the 
plugs.  Apparently when I plugged that green plug together on the cable 
that goes from the selector to the A/B snap switches that I jimmied one 
of those pins, as the selector started intermittently not seeing 
selected levers.  Or maybe it was just oxidized.  Anyhow, I believe I 
have that fixed satisfactorily also.
Appreciate the help from you guys.  Pretty sure it is the worst jukebox 
problem I've ever encountered.  I think it's been 3 years, 3 service 
calls and 2 trips to my shop, but hopefully it's finally over!!
Best
Mike