by Rob-NYC »
Tue Nov 04, 2014 3:17 am
Preston, here are some things to observe:
Remove stepper cover. Start select a high letter-number (k-10 is good) observe that first the letter stepper advances followed by a very brief interval when the transfer relay releases (at the top nearest the letter stepper) and that the next train of pulses advance the number stepper.
When the number stepper begins clapping it closes a set of contacts on top of the clapper. These actuate the two timing relays which in-turn cause the write-in when the train finishes.
If the transfer relay gets 'sticky" with residual magnetism, all the pulses willl fall on the letter stepper and there will be no w-i and thus no scan.
If the stepper wafer contacts are tarnished no punch signal will reach the memory unit and no scan. the same will happen if the w-i contacts on the timing relays are pitted or maladjusted.
If possible, make that vid that Ron mentioned.
Rob/NYC
"If we believe absurdities, we shall commit atrocities" -- Voltaire