Beginning Of Line (Bol) Alignment Procedure - AGFA Avantra 36/44 Service Manual

Avantra 36/44 Service Manual
5.2 Beginning of Line (BOL) Alignment
Procedure
Use the BOL Alignment Procedure to set the correct starting position of the laser
beam on the drum surface in the fast scan direction.
entering an encoder offset value in the AVDIAG Program. This value determines
the distance between the encoder's zero reference signal and the actual start of
the BOL. The value is stored in EEPROM on the DEC.
Tools Required: 18" Scale, eye loupe
Coarse Alignment:
1. Open the upper and lower right side doors.
2. Remove the drum light shield.
3. Remove the left carrier shroud to expose the laser beam on the drum sur-
face.
4. Pull out the door interlock switches to allow the spin motor to turn on with
the drum light shields removed.
5. Turn the system on and allow the boot cycle to complete.
6. With the PC connected to the diagnostic serial port of the system, launch
the AVDIAG program.
7. Enter the Align menu and select SGM-A/B Mod Align. Enter the following
parameter values each followed by Beam ON:
Resolution:
Gate Start:
Gate Length:
BOL Position:
NOTE: All the above values must be entered even if they are
already selected when you entered SGM-A/B Mod Align. If
not, the system can not calculate where the correct BOL
should begin.
NOTE: If the beam is not visible, either the intensity is too low or
the beam is 180˚ out of position. First, try entering a large
BOL position value change (i.e., 10000). At least a partial
scan line should appear at this point. If the beam is still not
visible, try entering a polarizer value. The polarizer value
entered should be close to the coarse density value for the
particular resolution currently set.
5-2 Alignment
3600
0
44.5
Enter an initial value (about 32000)
Position the beam by