I'm new here and a newbe to Pachislo. I got this at an antique shop in California, so it is tokenless Free Play and the token slot is sealed with plastic. There's no hopper or coin/token ramp.

During the full reset process the following happens:
1) Pwr switch on (with key clockwise):
The outside-right LED says "2".
The inside door LED shows 1 to 6 depending on last odds setting.

2) Pressing down play handle:
The outside-right LED changes to "0"

3) Turn key counter-clockwise:
Music starts
Lots of door lights
Outside-right LED changes to "HC"
NONE of the outside buttons do anything, wheels don't spin.

I read somewhere here that HC stands for Hopper Count Error, so I suspect it's a failed conversion. It's been imported by TDC Games, and there is a phone number, but I'm not expecting much help from them.

Any help would be appreciated. I'm a retired EE so I'm not afraid of electrons. I'll post photos if needed.