Since this thread is about 1027's as well as the rubber print heads, I wanted to let everyone know that I found the problem with my bad 1027.
The short of it is that there is supposed to be a thin round piece of paper between the solenoid that stops the printhead from turning long enough
for the hammer to strike the paper. If the paper is remove/destroyed the steel piston remains down (held down by the residual magnetic field) a
fraction of a second too long and the wheel continues to turn just a bit and you get garbage.
So if your printer is printing garbage slide the door on the top left side of the printer open and look inside for the print head rocker. If it is NOT
down you have a problem. The spring on the top of the solenoid should hold the rocker down. I cut a piece of thin paper (paper towel) about a
1/4 in round and put it between the plunger and the inside of the coil and this worked perfectly. I attached some pics...
1st. Is the sliding opening
2nd. Is the print wheel stop
3rd. Is the incorrect up position
4th. Is the solenoid to be repaired
Other things I had tried to fix this problem:
Replaced the main motor.
Replaced the sensors for the print wheel
Swapped the circuit board with the known good one from my other 1027
I also tried the bad mechanism on the good circuit board and visa versa
(I could replace stuff because I had a third 1027 that had a bad hammer movement motor)