Thermo Scientific Micro-Tech 9101 - Page 112

Maintenance and Troubleshooting
Opto22 Problems
4-18 Micro-Tech 9101/9201 Reference Manual, Rev J Thermo Fisher Scientific
3. View Opto LED. With input voltage supplied, LED should be lit.
 If GOOD—Replace either the Opto22 input module or the
Micro-Tech CPU board.
 If BAD—Replace the Opto22 input module.
Figure 4–11. Opto22 Troubleshooting—Input Module