Testing, Troubleshooting, and Maintenance
8-10 CENTRON Meter Technical Reference Guide
Test Mode Switch Does Not Place Module in Test Mode
Inspecting and Troubleshooting—C1S LCD and C1SR
Blank Display
Cause Solution
Switch Not Fully Depressed
Verify that the test mode pushbutton has been
completely depressed.
Switch or Electronic Failure Replace module.
Test Mode Items Not Selected
Re-program module with items to be displayed in
Test mode.
Cause Solution
Power not applied to the meter Apply power.
Loose power supply connection Remove and re-seat board to board connector.
LCD/LCD Driver failure
Replace Register circuit board.
Note: Energy reading and tamper flags may be
uploaded with the ZRO-C2A.
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