[Jukebox-list] Rockola 478 Reverse Relay. Chattering

[dirksenj at bellsouth.net]

I would suspect the contacts on the relay itself.

Jim
----- Original Message ----- 
From: "John D. Taylor III" <johndt3 at verizon.net>
To: <jukebox-list at lists.netlojix.com>
Sent: Sunday, December 02, 2007 6:57 PM
Subject: [Jukebox-list] Rockola 478 Reverse Relay. Chattering


>
> Greetings all,
>
> I have recently ran across a 478 Rockola reverse relay that chatters when
> trying to pick the record up to return it to the magazine.  During this
> chatter, the gripper motor jerks in time with the relay until the record 
> is
> returned to the magazine.  This is a very slow process.  Unfortunately, I 
> am
> not as familiar with the circuitry on this jukebox as I would like to be. 
> I
> pulled the mechanism power Board  checked the relay along with the
> components in the related circuitry.  All appeared to be well, with the
> exception of two capacitors that were only a little out of 
> tolerance,-which
> I replaced.  I noticed that when the record is canceled using any of the
> cancel options if I activate reverse relay for a half a second with my
> finger, then, it will stay activated until the cycle is complete.  During
> half sec that I am holding relay in by hand the transfer arm has not moved
> yet, so, none of the micro switches has changed position while I am 
> holding
> it manually. The relay is self holding by the time the transfer shaft 
> begins
> to turn within the cam switches on the end. I did found one forum where
> another mechanic had the same problem, he changed the mechanism control
> Board completely, but it didn't fix the problem for him, so I think I can
> eliminate the board.
>
>
> Okay, since I may have made this a bit confusing, I'll summarize.  When a
> record is canceled the gripper motor begins a jerky movement to pick up 
> the
> record and return it to the magazine, and a reverse relay is chattering in
> time with the jerk movements of the gripper motor.
>
> I have the schematics, but not the manual.  I really don't understand the
> sequence of operations on this jukebox.  However, I do have a schematic, 
> and
> I have tried to chase the circuit's all around this 9 foot square thing,
> this is when I realized I was in trouble and needed to ask for help. Can
> anybody help me with this problem?  Can you tell me the sequence of
> operations for the circuit? Have you ran into this before and know the
> solution? I welcome any thoughts, and/or debates relating to this problem.
>
> Thanks to whoever created this forum, it's been a great help to me in the
> past and I'm sure it will in the future.
>
> John
>
>
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