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Model 7754A/7414A
Table 5-4. Paper Drive Troubleshooting
Section V
Main tenance
Trouble
IMPROPER PAPER TRACKI G
(paper moves to one side or the
other)
PAPER TEARS AT Z-FOLD
PAPER JAMS I PRESSURE
ROLLER
PAPER WEAVES FROM SIDE
TO SIDE
IRREGULAR PAPER SPEED
I CORRECT PAPER SPEED
o
PAPER DRIVE
o
SIG AL 0
PAPER
Probable Cause
Worn brake felt or bent paper guide.
Uneven tension on paper brake arm
adjustment screws.
Excessive brake pad pressure. Also
see next item.
One pressure roller spring is weaker
than the other.
Paper brake arm tension not
adjusted or arm is dirty. Slick or
dirty drive roll.
Slick or dirty drive roll.
Solenoid wires to Transfer Board
loose or misconnected. Solenoid
coil or lead open.
Defective drive motor.
Galvanometer circuit problem.
CAUTIO: GALVANOMETER
IS NOT FIELD REPAIRABLE.
REPLACE ONLY PARTS SHOWN
IN FIGURE 6-18.
Solution and Paragraph
Replace worn part; 5-27. Establish
even paper tension, sligh tly more
on left side; Paragraph 5-24.
Adjust both brake adjustment
screws clockwise; 5-24.
Replace both springs.
Establish slightly more pressure
on left; 5-24. Clean or replace;
5-28.
Clean or replace; 5-28.
Check for bad connections, open
solenoid coils, leads.
Check drive motor fuse and cable
from power supply.
Refer to Table 5-3 for Driver
troubleshooting, and see Para-
graphs 5-29 to 5-34 for galvanome-
ter adjustments.
STYLUS TAIL PIVOT*
STYLUS PIVOT*
07754-1
.-~SLlDE
LOCKS (4)
SLIDE ROLLERS*
TABLE PIVOT ROD*
TABLE LINK
PIVOT ROD*
DRIVE ROLLER
BEARINGS
(2 PLACES)*
PRESSURE ROLLER
(2 PLACES)*
*LUBRICANT: ONE
DROP OF NO. 10
MACHINE OIL
DRIVE CHAIN
GEARBOX (OVERHAUL)
Figure 5-6. Recorder Lubrication Points
5-15
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