Ribbon Not Advancing on Electronic Typewriter
"My wife has a "Smith Corona" Model
SD800 electronic typewriter that will not advance the ribbon. Everything
else seems to work fine. We have been unable to find a local repair
for this unit. I think I can fix it with some advice from someone
familiar with these machines."
Can you determine if it is a mechanical or electronic
problem? For example, with the ribbon removed, does the gear or
post that drives it appear to try to turn or not at all?
Modern electronic typewriters are a combination
of keyboard, microprocessor, and printer. Therefore, the same sort
of troubleshooting approachs can be used as for computer printers.
Common electronic problems include bad connections
to the motor that advances the ribbon (cold solder joints, cracks
in traces on flex cable to carriage), bad motor driver chip, or
bad motor.
Mechanical problems include stripped or broken gears, misalignment
preventing advance mechanism from engaging, and defective ribbon
cartridge.
(From: Roger D. Waddell (rwaddell@peachnet.campus.mci.net).)
This problem is usually caused by a broken 'E'
clip on the bottom of the print hammer solenoid. The clip holds
on a lever that works in conjunction with the ribbon/correction
feed solenoid near the right front of the print carrier.
When the clip breaks, the lever falls out of position
and never trips the lever that assists in feeding the ribbon. I
have seen this problem many times!!
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