7 Defocus Adjustment
It is possible from steps 3 of this item in the state of step 5 of 6 .
Step No.
1 2 3
Operation Keys and Operation Method
In the Power ON state, selecting MD function,shortcircuit the "MECHA and GNG pin". Insert the test disc GGF1328 (MMD-212). Press the SYSTEM MENU(or MENU) key.(until "deFO AJST" is displayed.) Press the 6(or MD)key. of Defocus Value j
Defocus mode is entered, and after automatic execution of normal adjustment.
5 6
Check the jitter value and end the adjustment when the intermediate jitter value is 29 nsec or less. Press the ¶ (REC)of main unit key. of+04 j0130 The C1 error with application of a focus offset of about 0.4µm on the + side is displayed. The jitter value (J+) at this time is recorded. The C1 error with application of a focus offset of about 0.4µm on the � side is displayed. The jitter value (J�) at this time is recorded.
7
Press the ¶ (REC)of main unit key.
of-04 j0120
8
When J+ is larger than J-, press the ¶ (REC) of the main unit key when the focus offset is applied up to +0.4µm. (Do nothig when J- is larger than J+.)
of+04 j0130
9
Change the value with 1 and ¡ keys until the value becomes the same. Press the 6(or MD)key.
of+04 j0132 of+03 j0125 of+02 j0120 COMPLETE
10
When the smaller offset of the jitter value has been corrected mistakenly, press the ENTER(or SET) key and return to step 4. The mean value of the changed set value and the offset of the other setting limit is written into the EEPROM as the compensation offset. Release from the test mode.
