[Jukebox-list] Rockola 1438 Blown 1.6 Fuse

[Britt Abbott]

Jim, Jay, and Ron, thanks for the responses. Ron, I had read in a very old post and on another board to relocate the fuse to protect the power source on installing the modern silicon rectifier, never though to just wire an in-line fuse for that purpose. Would a 2.0 Amp inline be OK between transformer and rectifier? I'm thinking it's the gripper motor as I put in another fuse and when it blew, a record is now sitting in the gripper midway between the magazine and the record platter, ie. up in the air. It'll have to wait till after the Labor Day Weekend as I'm heading to Atlanta to the Jukebox Auction.... Any of you going to be there???

Britt

>From: Ron Rich <ronnnrich at yahoo.com>
>Date: 2007/08/28 Tue PM 12:53:18 CDT
>To: Jukebox mailing list <jukebox-list at lists.netlojix.com>
>Subject: Re: [Jukebox-list] Rockola 1438 Blown 1.6 Fuse

>Britt,
>  What I am wondering about is the relocation and value of the fuse. I would leave the 1.6 SB on the other side of the rectifier, and add a new "fastblo" type to the other side. 
>  As Jay suggested--usually just cleaning up those motors makes a big difference. Ron Rich
>
>Jay Hennigan <jay at west.net> wrote:
>  Britt Abbott wrote:
>> Well my Rockola 1438 stopped after putting a record back in the magazine. I suspect one of the motors, magazine or gripper motor is pulling to many amps. Sure enough when I checked the 1.6 Amp Slo-Blo for these mech motors,the fuse was blown. I had replaced the old original selenium rectifier with a new silicon bridge rectifier and relocated the 1.6 Amp fuse in between the transformer and the rectifier.
>> I have a couple of old replacement motors I can try. Is there anything tricky or is replacing the motors straightforward, ie. just a matter of disconnecting and putting another one in it's place? Can these motors be rebuilt? What component(s) typically fail in the motors?
>
>Brushes in the motors can fail, and are relatively easily replaced. 
>They are gearmotors. The gearbox is packed with grease which may be 
>hardened. Could also be a buildup of crud in the commutator.
>
>However, I would suspect the gripper arm mechanism first. If you 
>haven't gone through it, it is almost certainly gummed up and will put 
>quite a strain on the motor, causing it to draw excessive current. To 
>do this right requires taking them apart, clean and re-lube.
>
>Was the blown fuse just melted and pulled apart by the spring or is 
>there blackened material on the inside of the class? If melted and 
>pulled apart it is an overload (like a stalled motor). If blackened 
>stuff deposited on the glass, a short (like a bad rectifier).
>
>--
>Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
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