[Jukebox-list] Tehc Tip: Seeburg KD-200 Tormat/Selector issues....

[John Robertson]

John Robertson wrote:
> Well, for the moment I'm stumped. Using the tests (FS 92 pages 1 - 4) 
> for the KD200 I found that "H Test (Write in)" gives a suggestion that 
> the Electric Selector is defective. The test speaks to "Open circuit 
> pin C7 or defective starting switch" The problem for me is I can't 
> find any other reference to this 'starting switch'! If they are 
> referring to the switch in the SPU - that is fine, plus I have traced 
> the circuits through the RCSU-1, the Electric Selector and the Tormat. 
> All seem correct resistance and no shorts to ground that I have found 
> so far. I did try the "L Test" and this resulted in selection 'V1' 
> playing as it is supposed to - this again says the "Replace Electric 
> Selector (shorted to ground)" - but no shorts!
>
> Battery test works fine so the Read-Out circuitry is just fine - 
> thanks for asking.
>
> I've fixed a great many of these Tormat based machines over the years, 
> but this guy has me a bit troubled...I am considering testing the 
> Electric Selector with my 350VDC power supply to see if there might be 
> arc over which doesn't show up on a resistance test (no resistance up 
> to 20MR to ground) - but not sure if that will help.
>
> The Electric Selector looks great - continuity between the wipers is 
> perfect, no broken wires, no open circuits. Opened the plugs - all 
> look good.
>
> I'm overlooking something really obvious I'm sure...but need a fresh 
> viewpoint(s) from folks that have _/*serious*/_ experience with Tormat 
> write-in logic.
>
> The diode shaping circuit is good, capacitors have been replaced and 
> triple checked. Resistors all appear to be good (correct values in 
> circuit), voltages are spot-on...
>
> Tony? Anything you remember about this series? The PCBs are all good, 
> wipers all polished and resistance checks on the relays and wipers all 
> zero out when closed...
>
> Oh, and I've read the section on my web site about Tormats: 
> http://www.flippers.com/Seeburg-tormat.html and 
> http://www.flippers.com/Seeburg-trblshoot.html - and I'm rereading 
> these in the hopes that I can find the problem.
>
>
> John :-#(#
>
Turns out the problem (not writing in) was a missing top-side solder 
connection on the through pin of J515-BLU on the RCSU1/SU1 CODE A 
stepper unit.

This is a 1st generation double sided PCB and it appears the plate 
through was not perfect. What happened is Seeburg only soldered the pins 
on the bottom side of this board - this machine is serial #208843, my 
shop's KD200.22 #208290 had both sides of the critical pins soldered.

Not sure if #208843 was missed in Seeburg's QA checking or if they 
simply stopped soldering both sides sometime after #208290...

The pins to check that both sides are soldered are J515-BLU, J521-P, and 
J520-N.

Please make a note of this for your KD200 service manual.

John :-#)#

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