I've now got to the problem area. The final cog to the rack that moves
the cleaning carriage is binding in too tight in a small housing around
it, plastic against plastic, either plastic on plastic " bearing" or
plastic sides of cog against plastic housing, presumably chemical
reaction with the ink or time. It will just about turn with parallel jaw
pliers but that force would jump teeth farther back along the gear
chain, let alone driving by motor force. So what squirted in there will
dissolve the compaction or whatever. Moving by hand via pliers , has not
eased up on a couple of traverses.