Ben Ryves @benryves.com · Feb 24 1 / 3
After a thorough clean and gentle freeing of the printer mechanism I seemed to be missing the last four characters on each row. There are four solenoids and the one for that section wasn't firing. I traced it to a bad connection, fortunately not a bad flex cable but a failed solder joint.
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The manual "remote" switch didn't do anything, either. The remote relay could be switched on and off by the computer, so the CPU was working, but a bad diode (low, right) was preventing the CPU from testing the state of the remote switch (which shorts RMT CK and RMT SW).