Horizon Fitness APC-61 Manual page 24

2-1 blinks on the Display (Backgauge Does Not Operate) Part 3
Coupling of encoder unit is broken
Screw Shaft Coupling
Set Screws
When coupling is broken or set screws are
loose, rotation of screw shaft is not transmitted
to encoder and no pulse rises.
When coupling is broken, replace it with a new
one.
When set screw is loose, fasten it again.
Adjust knob is heavy
Encoder
Adjust Knob
Fix Nut
Adjust nut and fix nut prevent screw shaft
returning (backlash) of the backgauge. When
there is problem in screw shaft, nuts or guide,
screw shaft is hard to move and normal pulse
does not rise. Therefore, blinks on the dis-
play.
Oil on rail and screw shaft is running out.
When oil is running out, lubricate operating
the backgauge for-and backwards to circulate
oil.
There are some foreign objects on rail and
screw shaft.
When there are some foreign objects such as
paper dust, wipe them off and lubricate
enough.
There is problem in encoder.
Gauge Rail
Screw Shaft
Adjust Nut
Screw Shaft
There is contact failure or breaking of cable
from encoder.
2-4
Encoder is very delicate. When its shaft bends
because of external shock, it does not operate
correctly, even if it is connected with coupling.
Stay
Coupling
Axis difference or bent of shaft
should be within 0.1mm.
When there is an axis difference as shown in
the drawing, replace not only the coupling but
also the bracket and the stay.
Check the voltage between terminal 6 and 8 on
the terminal board 1 (refer to page 7-11) while
rotating the adjust knob slowly.
If the voltage changes
while rotating the knob
4
signal is output
from encoder normally.
Encoder Bracket
Encoder
5 6 7 8