Thermo Scientific Oretronic III, Operating & Service Manual

Page: 82 / 152

Maintaining & Troubleshooting
4-14 Maintaining & Troubleshooting Thermo Fisher Scientific
REC-4105 Rev L
Follow this procedure to determine why the clip detector is not working
properly.
Note
: You will need a digital volt meter (DVM) to complete this
procedure.
1. Check the system wiring based on the wiring diagram for your
system or the Field Wiring Diagram (D0744A-E001) in Appendix D.
2. Check the operation of the clip detector by placing a metal
screwdriver on the end of the upstream clip detector.
The display should show CLIP for the duration of the clip delay. If
CLIP is displayed, go on to the next procedure.
WARNING
High voltage that may be present on leads could cause
electrical shock.
ƒ All switches must be OFF when checking input AC
electrical connections, removing or inserting printed
circuit boards, or attaching voltmeters to the system.
ƒ
Use extreme caution when testing in, on, or around
the electronics cabinet, PC boards, or modules. There
are voltages in excess of 115 V or 230 V in these
areas.
3. If CLIP is not displayed, disconnect the clip detector wires at the
control unit.
4. Using a DVM, measure the voltage at TB2, terminals “7” and “8.”
5. The voltage should be approximately 24 VDC.
6. If voltage is present, the clip detector is defective and needs to be
replaced.
If voltage is not present, the TMD may have been damaged by a clip
detector wiring problem. Both the clip detector and the CPU board
should be replaced.
If you have determined that the clip detector is functional but still not
working properly, it is not seeing the clips on the belt. This may be
because the clip detector is too far from the clip and is out of the
detection range or because the clip is too small to detect.