[Jukebox-list] Wurly 3300 ?

[John Robertson]

Hi Ron,

Well, if the thermostat interrupter is working correctly then there 
are not a lot of suspects left. Looking in the 3300 manual - pages 3E 
<-> 16E - and noting what circuits use (40) {24VAC} you will see that 
most of them pass through either a circuit breaker or a thermostat 
(as well as the 8A fuse). Try testing those for correct function. 
Short the circuit breaker output to common and it should pop when the 
machine is turned on, I've seen these fail shorted, in which case the 
8A fuse will blow and the circuit breaker will simply sit there 
looking innocent.

Same process for the thermostat (32)THERMOSTAT(69)->function.

Intermittants are a real pain, but with a systematic approach you 
will find the bug.

John :-#)#

At 12:28 PM -0700 7/6/07, Ron Rich wrote:
>John,
>   Thanks for the tip--however this is an AC circuit--no brushes--and 
>it only blows the fuse every month, or so-- ( I suspect something, 
>but was hoping someone would confirm it).
>   Ron Rich
>
>John Robertson <pinball at telus.net> wrote:
>   At 9:26 AM -0700 7/6/07, Ron Rich wrote:
>>Hi All,
>>  Anyone have any idea why a 3300 Wurlitzer would -intermittantly-
>>blow the 8a. AC fuse? Does it anywhere between from 100-500
>>plays--TIA, Ron Rich
>>
>>
>
>Hi Ron,
>
>What I do in cases like this - where the item that takes out a fuse
>is not obvious - is I break the line after the fuse at the various
>devices powered by that fuse. Then I fuse each of them independently
>with a slightly lower value - say 5A on the 8A line, and the one that
>pops shows the likely suspects' area.
>
>Aligator jaw jumper wires and a handful of fuses will usually resolve
>this in an hour or so...
>
>Oh, and if there is a DC brush style motor on the circuit that
>intermittently blows a fuse, check the commutator for carbon shorts
>between the elements.
>Link to nice picture of armature with the commutator as the closest part.
>http://www.microchip.com/stellent/groups/designcenter_sg/documents/market_communication/~export/en026724~5~en006096~BasicLayout/48808-2.png
>
>John :-#)#
>--
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