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MAINTENANCE AND TROUBLESHOOTING
Normal maintenance is limited to performing calibration checks, and re-calibration if
necessary. Refer to the following chart of symptoms, causes, and repair comments:
SYMPTOMS
Display shows garbage
Display
never
finishes
initializing
Display restarts when a
pump switch is toggled
Displays do not turn on
Removal of rear fittings may damage the indicator!
If a rear fitting seems to be too tight, and there is danger of damaging the plastic case,
follow these instructions to prevent irreversible damage to the indicator:
1. Disconnect power and external tubing, and remove indicator from test unit.
2. Remove front keypad panel. (Some older units have this panel glued in place. If
this is the case, carefully cut around the top and bottom keypad edges, then insert
a thin prying knife, and gently pry top panel until released.)
3. Remove small screws on display, then pull out electronic circuits.
4. Remove small screws used on power connector.
5. Disconnect internal tubing (mark tubes to match with fittings for reassembly).
6. Push fitting out from the inside.
7. (Older, non-production units: Use deep socket wrench to hold internal fitting
while removing rear fitting.)
8. Reassemble indicator. (Note: the screws for the power connector are longer than
the screws for the display.)
CHAPTER 4
POSSIBLE CAUSES
Microcontroller had a
power brown-out
Bad solder joint or sensor
Low Voltage condition, or
electrical
interference
affecting the instrument
Low voltage
COMMENTARY
Re-cycle power.
Return unit to factory.
A capacitor may need to be
is
placed across power supply,
or use higher amperage
power supply.
Verify power to unit.
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