Tech Tip: Seeburg KD-200 Tormat/Selector issues....

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. 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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