Tally Dascom 7010 Series Maintenance Manual page 131

12) Remove the "Ribbon-tension spring adjust ribbon (φ80mm)" and reset the "Ribbon-tension
adjust ribbon (φ60mm)".
13) Hook a spring gauge of 500gf on the "Ribbon-tension adjust ribbon (φ60mm)" and slowly
pull the ribbon end downward at a constant speed (approx. 7.5cm/sec. or so). Then, check
if the reading of the spring gauge in the steady state is within 450 +/- 50gf.
If the reading is out of the specified range, repeat above sub steps 4) through 11).
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3-6. Adjustments