Rockola 470 blown by incorrect Voltage

Please help

My friend plugged my 110V Rockola 470 into a 220V wallsocket without the transformer. What kind of damage can I expect and how can I fix it? Is there something as simple as a fuse blown or is it a major damage?

Tommy Elvis

Hi Tommy,

normally, if you are lucky, a simple fuse is blown in the primary circuit of the power transformer. Should there be no fuse or a wrong one, the power transformer itsself can be damaged.

Regards, Dieter

Thank you Dieter for your quick response

Would it be the entire power supply unit that I need to replace:
ROCK-OLA 469 & 470 jukebox part: Tested / Working POWER SUPPLY 48445-1-A

Or is there a separate transformer on these machines?

I don t really know, I need the schematics.
Maybe someone else has the answer.

Dieter

Hello Tommy,

before replacing the power supply unit, you should check also all secondary fuses in your box.
As far as I can tell from the pictures, there are 3 "circuit breakers" on the left side (simply push in) and 2 or 3 glass fuses inside the power supply unit.
In the user manual or schematics, you should find the location of all fuses in your box and their correct vlaues.

Good luck !

Jürgen

Thank you Jurgen, that's very helpful :)

There's only one reason to change the complete power supply, a blown transformer, simply because it's cheaper.
All other problems, like blown fuses, shorted rectifiers, exploded capacitors, can be repaired.
To prevent this problem, it's a good idea to mount the 230V to 120V transformer permanently inside the jukebox.

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