Re: Rockola 454/456

[g0pkh]

Bob Raney;688832 Wrote:
> Hello, I recently acquired a couple of Rock-ola jukeboxes for $75. I
> got the 456 Deluxe Console to basically work by removing the two motors
> and manually freeing up the stuck mechanisms, and motors with
> lubricants. Everything seems to be in working order except the Scan
> Motor never stops scanning. I can make a selection; it finds the
> record; pulls it and plays it; finishes; puts back in place and scan
> continues even though another selection has not been made. I have a
> number of Wurlitzers (6), and a Rowe R-90 jukebox; but these are my
> first Rockolas. I have recently ordered the Parts, Service, and
> TroubleShooting Manuals but thought I would inquire helpful hints from
> this web site. Any advise or suggestions would be helpful for an
> impatient old guy like me. Thanks, Bob (S. Ca.)

Hi Bob

On the 456 machine, I think you'll find that the scanning motor is
ultimately controlled by the play relay (on the PSU). This relay is
controlled by 2 things

The wobble plate switch (micro switch on the top on the pin bank, with a
small solenoid attached).

And the homing wiper, this is a track with a wiping contact that is on
the far right of the pin bank (i think its the outside track) there is a
gap in this track at the magazine home position). This wiped connection
is in parallel with the wobble plate switch, and both in series with the
play relay.

The basic mode of operation is that while any selection pin is in the
play position the wobble plate switch is closed. Once the machine has
finished playing the last selection and reset the pin, this switch will
open.

Continuity for the play relay will be maintained via the homing wiper,
the magazine will continue to the home position where the homing wiper
will then open, the play relay will drop out removing power to the mag
motor. Hence stopping further rotation.

Check the wobble plate switch for correct operation. And also check the
play relay.

On my 474 machine I had exactly this problem, it was caused by the
relay's armature actually sticking, even when the solenoid relaxed.

Hope this helps

Pete




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g0pkh

[Bob Raney]

Hi Pete,
Thanks for the info. I received the various manuals and no where does
it discuss this info or at least not to where I can understand. The
trouble shooting manual has lots of info, but your info seems dead on to
my problem. Thank you very much. Bob

--
Bob Raney

[Bob Raney]

Pete,
I owe you a Steak dinner. This was the entire problem. The wobble
plate switch was stuck in the closed position and couldn't open no
mater what. By manually opening this switch while it was scanning; it
"stopped" exactly where you said it would. Thank you ever so much.
I've been spending hours tracting wires and looking for a short and
something as simple as this. Wow, Thanks Bob

--
Bob Raney

[g0pkh]

Bob Raney;688932 Wrote:
> Pete,
> I owe you a Steak dinner. This was the entire problem. The wobble
> plate switch was stuck in the closed position and couldn't open no
> mater what. By manually opening this switch while it was scanning; it
> "stopped" exactly where you said it would. Thank you ever so much.
> I've been spending hours tracting wires and looking for a short and
> something as simple as this. Wow, Thanks Bob

Great news Bob.

How's that from me, A complete newbie to the world of jukeboxes.
I have only ever restored one.

I am fascinated by them however, and studied the service manual for a
very long time after I got it working, just to try to completely
familiarise myself with its operation. Sad I know, but enjoyable.

Your 456 machine uses essentially the same mech as my 474, so the
circuit arrangements had to be similar

Glad I could help.

Enjoy.

Pete




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g0pkh