1053 has many adjustments quite far from correct, working through each section of the machine

PRINT ESCAPEMENT CAM VERY FAR OUT OF TIME

There is a cam that rotates for each print cycle, so that at the end of typing a character on the paper, the carrier will advance one column. The cam should have been adjusted so that the linkage is at the low point on the cam when not printing - this ensures the correct timing between typing a character and spacing afterwards. 

When I looked at the machine, the cam was almost halfway out of phase, pulling on the escapement link while at rest. This would space while the typeball was flying, producing smeared and improperly spaced characters on the paper. I rotated the cam to its proper setting, thus achieving the proper spacing at the end of each print cycle.

Rest position at low point of the escapement cam

OPERATIONAL CAM LINK TO ACTIVATE TAB INCORRECT

When the tab button is pressed, it releases a clutch on the main shaft which spins the clutch one half turn. The clutch pulls on a turnbuckle link which rotates the tab bar. The bar should latch the escapement lever out of the escapement rack to start the carrier moving to the right. However, if the bar isn't rotated enough then the mechanism does not latch. The symptom is a short movement but not sustained tab movement. 

Since the carrier was only moving a couple of columns regardless of the tab settings, I began checking the mechanism that rotates the tab bar. This is spring loaded to sit at a stop position and be rotated when the link pulls. I saw that the spring was unable to pull the mechanism all the way up to the stop position and the result was inadequate rotation of the tab bar.

I realized that the turnbuckle link was way too short. Once I adjusted it, starting a tab operation fully latches the escapement and the carrier moves to the right until it encounters a tab disk in the set position, which releases the escapement latch. 

Spring pulls tab lever fully up to the stop position

Turnbuckle link that was lengthened

SPACE ESCAPEMENT JUMPING MULTIPLE COLUMNS

The 1053 has two different mechanisms that activate the same escapement bar. One is driven by the print cycle cam as discussed above, while the other is activated when the clutch on the main shaft is triggered to drive a space operation. The Space button on the front panel and the space solenoid both use this second escapement method.

Unfortunately, the carrier moves about three columns every time this is activated, rather than the single column that occurs with the print escapement. I had to diagnose the cause for this - obviously some adjustment - and fix it.