Adjustment - Eiki EK-620U Service Manual

4-6 Adjustment

1. Focus Adjustment
Note: This step must be done only when the optical engine
module is changed.
Inspection item
Criteria
Procedure
- Check the focus under the pattern of full
screen by the distance of 2.5m.
- Unbalance<=30cm
- If the unbalance is over 50cm,pls do the
focus adjustment as below procedure.
1) Back focus ensure
- Change to "Full Screen" pattern, adjust the
lens room widest, adjust the focus fuzzy,
then measure the minmum imaging
distance,confirm whether the distance value
in the lens specifications of +/- 3cm.
- If not, adjust the three setscrew to the
specification.
- If yes, go to next step to do bore sight
adjustment.
2) Bore sight adjustment.
- Use focus button to adjust focus to make
position 3 in focus.
- Once position 3 is in focus, check position1
If position 1 is not in focus, use focus up or
down key to adjust focus till it is in focus.
- If pressing focus up key can focus position1,
EK-620U/EK-621W 4-8