Symptom Section
Display segments missing or display incorrect Display segments missing
Transmitter locked up, all display segments lit Transmitter locks up
Transmitter periodically restarts itself Transmitter periodically restarts itself.
Id000 in display
A security code has been programmed into the transmitter. The correct code must be
entered before the transmitter can be programmed or calibrated.
Transmitter not responding to IRC
1.
Be sure the transmitter is receiving the signal.
a. Clean the window in front of the IR detector, The detector is a small rectangle
just above the main display.
b. Hold the IRC at least six feet from the transmitter and not more than 15 degrees
from the center.
c. Hold the IRC closer (within two feet) in case the batteries are getting weak.
2. If Step 1 fails, check the IRC.
a. If a second 5081-P transmitter is available, test the IRC on that transmitter. If a
spare transmitter is not available, continue with Step b.
b. The green LED, located just above and between the RESET and HOLD buttons,
should light when a key is pressed. A piece of black rubber film may be covering
the LED. Scrape the film away with your fingernail to expose the LED. The two
clear LEDs on the front end of the IRC never light. They transmit the invisible IR
signal.
c. If the green LED does not light, the IRC is not working. Go to Step 3.
3. Take the IRC to a non-hazardous area and replace the two 1.5 Vdc AAA batteries.
• If the green LED lights, but the transmitter still does not respond, go to Step 4.
• If neither the LED lights nor the transmitter responds, replace the IRC.
4. Replace the transmitter display board.
SLOPE Err LO or SLOPE Err Hi appear after calibration attempt
Refer to SLOPE Err LO and SLOPE Err HI for assistance in solving calibration slope problems.
bF1 or bF2 continuously flashes during auto calibration
During autocalibration, bF1 or bF2 flashes until the pH reading of the sensor in the buffer is
stable.
Diagnostics and troubleshooting
Instruction Manual 69
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