Rowe R88 continuous speaker noise

[Koeppen]

I have a Rowe R-88 jukebox.  There is a hum that increases with the volume increase.  Note this short Youtube vid:

I've replaced the capacitors in the amp and the capacitors for the speakers.  I've tested the power supply capacitors and they are good.  I did notice that the power supply had been rewired at some point.  The hum is still there.

So I started to disconnect everything in an effort to locate a grounding issue.  Then I unplugged everything from the power supply.  With the power supply turned on and with everything unplugged from the power supply to the jukebox components, there is a quite hum coming from the speakers?

Any ideas?  Does anyone have the wiring diagram for the power supply.  I can't think of anything else.

[ami-man]

Hello Koeppen,

Is this noise that increases when the volume is turned up during play or when the jukebox is at standstill?

If it is whilst the jukebox is at rest then you can not have the mute plug connected or the connection are incorrect.

Check that the two pin connection is plugged in on the pre-amplifier board and that the six pin Mute Molex plug is connected.

The last time we tested for a similar issue it was down to a bad connection on the Mechanism Control loom.

Regards
Alan

Alan Hood
ami-man
UK