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CHAPTER 5
MAINTENANCE REPAIRS AND TROUBLESHOOTING
Note: Refer to the Theory of Operation section as a reference on how the various systems
function.
Annual Maintenance
The following annual maintenance is recommended:
1. Check color of beads in air reservoir/dryer. Change if pink. The dryer is a common in-
line dryer used in small air compressor systems. A new dryer can be purchased from
Preston Pressure, or an internet search for “mini inline desiccant air dryer” may lead to an
alternate source.
3. Verify batteries are fresh. Avoid old batteries that may leak and corrode the battery
contacts.
4. Verify vacuum reservoir tank is mounted tightly.
5. Verify pump cylinders are tight.
6. Verify switches and valves on front panel are mounted tightly.
8. Test for leaks.
9. Perform calibration checks, and re-calibrate if necessary.
• Troubleshooting
Refer to the following chart of symptoms, causes, and repair comments:
SYMPTOMS POSSIBLE CAUSES COMMENTARY
Display shows garbage or
freezes at the beginning
display.
Microcontroller had a
power brown-out or there is
a low voltage condition.
1.Turn off unit for 15
seconds before powering up
again.
2. Re-cycle power switch. If
problem occurs frequently,
it may be caused by a
corroded switch. Also check
battery contacts.
Display never finishes
initializing
1. Tester is being operated
in conditions that are
1. Operate the tester in a
warmer environment.
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