proteus collimator

Proteus Service Manual says take off the cover & open up the front of the collimator.

"Verify the setting of the DIP switch on the D1-Board. The DIP switch S2 on the D1-board must be set as follows:
S2.1 = ON
S2.2 = OFF
S2.3 = ON
S2.4 = OFF
S2.5 = OFF
S2.6 = ON
S2.7 = ON
S2.8 = ON
Start the collimator calibration mode to get the calibration data stored in the EEPROM.
Note: Without calibration data in the EEPROM of the board D1 the collimator startup may fail.
For collimator calibration carry out the following steps:
a) Verify the DIP switch S2 on D1 (see above). It’s important that switch S2.4 is set to OFF.
b) Close the lamellas in both levels (longitudinal and transversal) manually.
c) Connect the collimator to the power supply.
d) Set dip switch S2.4 to ON
e) The collimator will start a calibration run. The lamellas will fully open to the photoelectric barriers and then
close to the minimum opening.
The calibration data will be stored in the EEPROM.
f) Verify the setting of the DIP switch on the D1-Board again. The new settings are
S2.1 = ON
S2.2 = OFF
S2.3 = ON
S2.4 = ON
S2.5 = OFF
S2.6 = ON
S2.7 = ON
S2.8 = ON
g) Now the collimator is full working.
h) Disconnect the power supply before closing the collimator."

That is usually all that is needed. If the sizes displayed are not correct for some reason, I would check the cassette trays first and then do the "size display" calibration as described in the service manual.