Quoted from keywest:
Thanks Baldtwit -
When you mention the issue could be above wire 90 on the schematic does that include an issue up in the magic squares feature unit, spotting disk, etc. ( I see there are wipers up there that work with the mixer to spot 2 & 18... Maybe a broken wire on those connections or?)
the only thing above wire 90 would be a couple wipers on the magic squares feature unit (MSFU). Stuff at/above wire 25-6 is ok because the magic squares feature unit is stepping.
below is the circuit. Since the magic square feature unit IS stepping, the circuit in green is ok. That leaves the path in red (and the messier way the red path could go thru the alt 9B switch) as not working.
keep in mind how the whole things works. The game will spot one of the two numbers when the magic square feature unit is at step 7 and higher. If the 2 or 18 trip relay is untripped, then 18 is spotted. If the 2/18 trip relay is tripped, then 2 is spotted.
your symptom is the 2/18 trip relay is never tripping, and checking the diagram for the MSFU in the manual, the only time wire 25-6 is connected to 90 is when the MSFU is at step 6. The game decides which number will be spotted on the step before the MSFU enables spotting.
probably the simplest way to find the problem is a jumper wire. Stick one end on wire 30 on the transformer ... that's the fat yellow wire that loops from an upper lug 10 to a lower lug 9 then off to the game (see pic below). Put the other end on wire 23-5 on mixer #3. The 2/18 relay should trip. If it doesn't, then either the coil is bad or more likely switch L2 needs clean/adjust (manual page 144).
if the 2/18 does trip, manually reset it an move the jumper from 23-5 to 90 on mixer #3. Turn the mixer 3 rotor backwards a few positions by pushing up/around the mixer rotor ... making sure the wipers aren't snagging rivet edges ... and the 2/18 should trip.
if that works, the problem is the wire 90 to wire 25-6 connection on the magic squares feature unit disc.
since it's probably hard to tell wire colors on mixer 3, below is the mixer 3 diagram from:
just count the wire lugs from the notch on top of the contact plate to find wires 90 and 23-5.
if you didn't have the mixer diagram and can't tell wire colors, an alternative to test if most of the circuit works is to jumper wire 90 to wire 25-6 on the magic square features unit - which there is a diagram in the manual for. That will make it way more likely to trip the 2/18 trip relay any time the magic squares feature unit is stepping. If no 2/18 trip, you know the problem is below wire 90.
make sense?kw2 (resized).jpgint-key_west-transformer (resized).jpgmixer-key_west-mixer_3 (resized).png