Greenheck AMD-xx-TD Transmitter - Manual (Page 32)

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Personnel should be familar with the operation of the Vari-green (see Section 5) before performing any
troubleshooting.
Problem Solution
Dispaly blank; with backlight and
outputs - Check the display’s ribbon cable for proper seating in transmitter dicuit board
- Bad display or transmitter board
Display blank; no backlight with
outputs - Check the display’s ribbon cable for proper seating in transmitter circuit board
- Defective display
Display blank with backlight and no
outputs - Defective display
- Defective transmitter board
- Check the CPU LED flashing on transmitter board (located to the right of the display on the
transmitter board. Figure 4.2)
Display blank without backlight and
no outputs - Check for proper supply voltage at P8 terminals 1 & @ (see Figure 4.2, Page 6)
- Check F1 fuse
- Defective transmitter board
- Check the CPU LED flashing on transmitter board (located to the right of the display on the
transmitter board. Figure 4.2)
Normal Operation with Extremely
Low or High Flow displayed - Check F2 fuse
- Verify upon powering up transmitter that all sensore are “Found” and “Enabled (section 5.2)
- Verify Factory Set Up data is correct in Operator Menu under “Flow Configuration” (section 5.8)
- Enter Supervisor Menu (Section 6), “Diagnostic Display Selection” (Section 6.4). Scroll through
all sensors, log data, and contact the Factory.
Display reading “0” flow with NO
“Alert” message - Ensure Flow is above lockdown (see Section 5.8)
- Check cable connections
Display reading “0” flow with “Alert”
message - Indicated there is a fault with one or more sensors
- Perform “Diagnostic Alert Determination: in the “Supervisor Menu; determine if “Sensor” or
“Average” alert (Section 6.5)
- Perform “Diagnostic Display Selection” in the Supervisor Menu; determine which sensor has a
failure (Section 6.4)
If after the following the Troubleshooting steps the Vari-green continues to operate improperly, contact the Factory for further assistance
(see Section 10).
8 - Troubleshooting