Technical data

3-38 Chapter 3
Adjustments and Correction Constants
Loading Firmware
— If any of the following LED patterns are present, the firmware disk may be defective.
— If any other LED pattern is present, the CPU board is defective.
NOTE If firmware did not load, a red LED on the CPU board will be flashing.
• If the following LED pattern is present on the CPU board, suspect the disk drive or
associated cabling:
LED Pattern
CH1 CH2 R L T S
✲
✲✲
✲✲
✲✲✲
✲
✲✲
✲✲
✲✲ ✲
✲✲
✲✲✲
✲✲✲
✲✲
✲✲ ✲
✲✲✲O ✲✲OO
(front of instrument ⇓)