Troubleshooting - PRESTON PRESSURE PS-500 User And Maintenance Manual

 Troubleshooting
Refer to the following chart of symptoms, causes, and repair comments:
SYMPTOMS
Display shows garbage or
freezes at the beginning
display.
Display never finishes
initializing
Display flashes
BATTERY"
Motor does not work
Displays do not turn on
Battery does not take a
charge
Unit will not vacuum up to
35,000 feet
POSSIBLE CAUSES
Microcontroller had a
power brown-out or there is
a low voltage condition.
1. Excessively cold (below
freezing).
2. Low battery
"LOW Battery voltage is low
Bad charger or charging
plug
1. Low battery voltage
2. Bad
connectors or solder joint
3. Bad motor(s)
1. Low voltage
2. Bad fuse(s)
3. Bad wiring or connector
4. Bad power switch
1. Bad battery
2. Bad power charger
3. Bad fuse
1. Leak in internal hoses or
plumbing connectors
2. Motor is weak
3. Debris has entered pump
COMMENTARY
1.Turn off unit for 5 seconds
before powering up again.
2.
battery and circuit board.
Also check for loose fuses.
1. Operate the tester in a
warmer environment.
2. Re-charge battery.
1. Connect charger.
2. If charge is rapidly lost,
there is a defective battery.
1. Replace fuse(s)
fuse, switch, 2.
connectors, solder joints and
crimp terminals.
3. Replace bad motor(s)
1.
battery voltage remains low,
or charge is rapidly lost,
there is a defective battery.
2. Replace fuse(s)
3. Check and repair wiring
or connector as needed.
4. Replace power switch.
1. If battery charge is rapidly
lost, there is a defective
battery.
2. Replace power charger
3. Replace bad fuse
1. Troubleshoot plumbing to
find leak(s)
2. Replace defective motor
Check connectors
Check switches,
Connect charger.
20
to
If