Adjustment Procedures 31
5-4 Photoelectric Cells Note: to perform the following adjustments, it is necessary to remove bot h plastic side covers first. See
section 4-1: Disassembly/Reassembly Plastic Side Covers.
Necessary tools: small flat-head screwdriver.
The Photoelectric Cells are mounted on the arm assemblies of the up per roller. Viewed from the front-
side of the machine, the transmitter is mounted at the left-hand side a nd the reciever is mounted at the
right-hand side of the machine.
1. Switch the machine on.
Caution! The electric parts of the machine are now live. From now on, d o not touch any electrical
components. Do not place fingers between the chain or other moving parts .
2. See figure 34, white arrow. Make sure, that
the slit in the mode selector is pointing to the
‘D’ position (the setscrew is rotated fully
counter-clockwise).
3. See figure 35. Rotate the setscrew in the
transmitter (at the left-hand side of the
machine) fully counter-clockwise. The
transmitter will now emit very little light.
As a result of this, on the receiver (figure 34)
the red LED will be lit (meaning: there’s no
signal), and the green LED will be lit as well
(meaning: the ‘no-light’ situation is stable)
4. Now rotate the setscrew on the transmitter
very slowly clockwise until the the green LED
on the reciever starts to fade out, next rotate a
bit further clockwise until the red LED goes
out, and finally rotate a bit further clockwise
until the green LED is just fully lit (which is
only a few degrees more!).
Note that the red LED gives a faint flash every
two seconds: this is the self-check sequence.
The Photoelectric Cells are now correctly adjusted.
Switch off the machine and disconnect it from the
mains.
Replace the plactic covers.
fig. 34
fig. 35