Tech Tip: Seeburg KD-200 Tormat/Selector issues....
John Robertson
> 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. The factory had never soldered this!
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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--
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