Enhanced core processor LED states (continued)Table 10-14:
LED state Description Recommended action
OFF Core processor receiving less
than 5 volts
• Verify power supply wiring to core processor.
• If transmitter status LED is lit, transmitter is re-
ceiving power. Check voltage across terminals
1 (VDC+) and 2 (VDC–) in core processor. If
reading is less than 1 VDC, verify power supply
wiring to core processor. Wires may be switch-
ed.
• If transmitter status LED is not lit, transmitter
is not receiving power. Check power supply. If
power supply is operational, internal transmit-
ter, display, or LED failure is possible – the me-
ter may require factory service.
Core processor internal failure The meter requires factory service.
10.30 Perform a core processor resistance test
1. Power down the transmitter.
2. If you have a 4-wire remote installation or a remote core processor with remote
transmitter installation, remove the core processor lid.
3. If you have an integral installation:
a. Loosen the four cap screws that fasten the transmitter to the base.
Integral installation componentsFigure 10-3:
Base
4 x cap screws (4 mm)
Transition ring
Transmitter
Core processor
b. Rotate the transmitter counter-clockwise so that the cap screws are in the
unlocked position.
c.
Gently lift the transmitter straight up, disengaging it from the cap screws.
4. If you have a 9-wire remote installation:
Troubleshooting
Configuration and Use Manual 207
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