Crt Adjustments - Zeiss humphrey HFA II-i series Field Service Manual

Adjustment / Calibration
Calibration Procedure
NOTE: Use the pencil eraser tip, or similar soft-ended implement, during this procedure.
From the additional setup menu, select Touch Screen Calibration. If you are
1)
unable to access the additional setup menu, you can power-up the instrument while
depressing the patient button until the touch screen calibration menu comes up. This
will take approximately 2½ minutes.
2) Follow the instructions displayed on the screen.
When you are instructed to press the rectangle in the Top Left Corner, note exactly
where it is within the rectangle that you touch the screen. This will enable you to
"follow the error," (as described above) if another attempt at calibration is necessary.
NOTE: press the rectangle only once; then wait for the screen to display the instruction to
press the rectangle in the Bottom Left Corner.
When you touch the rectangle, again note exactly where you touch the screen.
4.9.5

CRT Adjustments

Special Tools / Equipment Required
Plastic Slot-Tip Alignment Tool
P
Operator Panel Extension/Support Tool
P
Extension Cables
P
CRT Overlay Template (refer to service bulletin HFA2-029)
P
WARNING: During these adjustments you will be working closely
around the back of the CRT with power applied. Work carefully to
avoid the areas where the CRT high voltage is present.
Procedures
NOTE: Because some of the CRT adjustments interact, they should be performed in the
order presented here.
All of the CRT adjustment control pots are located on the CRT Driver PCB (Figure
4-13). The name of each pot is labeled on the PCB.
Field Service Guide
Humphrey Field Analyzer II - i
Confidential and Proprietary
4 - 38 52235C1105