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At last, Ifinished the « hardware » mods and wired the MCU… So far, so good. Butthe rig don’t seems to work.
I’mchecking again and again all the different options, but don’t see where mygremlin is hidden.
WhenI’m starting the printer, after the initial check (without any carrier in theNPIS), the green led lights on, and after 4 seconds the feeder starts rollingwithout interruption during 60 seconds. All led are flashing at the end of thesequence.
IfI place a carrier in the roller at this stage (before the motor stops), the carrier his “slurped” thruthe printer, and stop moving when the end of the carrier has passed the NPIS (2inches away from the npis). To eject the carrier, I have to “block” the npiswith a piece of pcb or whatever, and press on the “run” button. The sequence ends with a "paper jam" alert only.
Voltagemeasurements on the mcu board
Pin5 of the MCU goes low when no carrier detected in the NPIS, high whenobstructed.
5 V is ok on pin 8 (5.02V, perfect)
Pin6 is high, goes low after approx. 1 second and stay low during 3 seconds when “X”or “run” is pressed
Pin7 is high, goes low after approx. 3 seconds and stay low during 4 seconds when “X”or “run” is pressed
Pin3 is high, goes low after approx. 1 seconds and stay low during 4 seconds when “X”or “run” is pressed
Pin2 is high (3.3v), goes briefly low when “X” or “run” pressed, then back tohigh, and briefly low again then high when “X” or “run” released
None ofthese timing are accurate (counting in my head, looking at the scope). If moreprecise measurement should be done, I’ll have to build a “poor man’s logicanalyzer” with a cypress or an Arduino and it will takes a little more time
The two blue wires coming from J27-4 and J23-1 are left unsoldered (should I cut ?)
Hope this checklist is accurate enough to help find a clue
Tnks
Marc