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Section 1. Basic Unit
Procedures outlined for removal and adjustment of the
machine units are intended as guides. Adjustments should
be kept close to the specification, but the procedures
preferred may vary among experienced customer engineers.
4.1 BASE
4.1.1 Diodes
Check diodes for shorts or opens by using an ohmmeter.
4.1.2 Arc Suppressors
Check the arc suppression RC units by substitution, never
by running the machine with the arc suppressors removed.
The RC units are highly efficient at reducing destructive
arc.
CAUTION
Operation of the machine without arc suppressors may
cause considerable damage.
4.2 DRIVE
4.2.1 Drive Motor
Factory lubrication of the motor should last one year, if
normalusage is 40 hours per week. Oil sparingly.
4.2.2 Drive Motor Belt Adjustments
4.2.2.1 Belt Tension
Elongated motor-mounting holes permit adjustmentofbelt
tension for 1/4-inch deflection midway between pulleys.
4.2.2.2 Belt Size
Check part number of belt. A different size belt is used
when machine hasprint feature.
4.2.3 Backspace Mechanism Service Check
Check that 20 consecutive columns of backspacing does not
affect card registration. The actuating arm should be
straight and free of binds so that its spring can return it to
normal position.
To ensure proper backspacing, check escapement arma-
ture adjustments (4.4.1).
4.2.4 Backspace Mechanism Adjustment
1. Position backspace ratchet with its three screws to cause
a card to backspace into column | and not into column
Chapter 4. Checks, Adjustments, and Removals
88 of program drum. Each backspace should cause
escapement wheel teeth to move1-1/4 teeth past end of
armature.
2. Position backspace switch to operate with 1/16-inch
depression of the actuating arm.
4.3 FRICTION DRIVE
4.3.1 Friction Drive Service Check
DANGER
high-speed skip feature is installed.
Press the release key and place right index finger on the
10X blade. Gradually release the pressure of the left hand
until only the blade prevents turning of the wheel. Read the
gram gage.
Gram tension should be measured and adjusted after the
machine has warmed up.
10 X Blade
Knurled screw used
to store blades
Escapement Wheel
Figure 4-1. Friction Drive Adjustment
29 FEMM
(4/69)
4-1
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