TI Silent 700 print mechanism mechanical issues, and Model 763/765 bubble memory notes
chrise at pobox.com
Sun Jul 10 21:51:56 CDT 2016
I've restored a couple Silent 700 and found that the grease in the head lift solenoid had become very sticky (ie, no longer grease) and after completely cleaning and applying new (white lithium grease) the solenoid works much better. I also had one of the knobs you mention split but was able to repair with super glue.
I also found that the line advance belt in one unit had been completely "eaten" by, I assume ozone, and all that was left were the fiber glass threads. Amazing.
Love these Silent 700s, so keep 'em running!
On July 10, 2016 9:38:15 PM CDT, Eric Smith <spacewar at gmail.com> wrote:
>On further study, I find that I misunderstood the nature of the print
>mechanism in the TI Silent 700 model 763. What I thought was the line
>advance solenoid is actually a head lift solenoid. It fooled me
>because it is actuated every time the line is advanced, but the actual
>line advance is performed by a stepper motor, like the newer variant
>of models 743 and 745, rather than by a solenoid as in the older
>variant of models 743/745.
>The missing spring and knob prevent the head from being held in close
>enough proximity to the thermal paper. I'll have to figure out how to
>secure the parts in place in order to make it work reliably.
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