• 20 •
Troubleshooting the Display
If the display does not turn on:
• Check the connection to the vehicle battery.
• The vehicle battery may be too low (below 1 volt) to power the ana-
lyzer. Fully charge the battery and retest.
• The analyzer’s 9-volt battery may need to be replaced. Follow the
directions in “Replacing the MDX P-300 Battery” and replace the
9-volt battery (alkaline recommended).
• If the analyzer does not power on when you press and hold the
MENU button, replace the 9-volt battery.
• If troubleshooting does not solve the problem, call 800-776-1995 to
obtain service. See “Patents, Limited Warranty, Service” on page 22
for more information.
Replacing the MDX P-300 Battery
The MDX-P300 uses a 9-volt battery (alkaline recommended) that allows
testing of 12-volt batteries discharged down to 1 volt in addition to sup-
plying power while the option menu is active. The MDX can test down to
5.5 volts when the internal 9-volt battery is not functioning. When the 9-volt
battery needs replacing, the tester displays LOW INTERNAL BATTERY,
REPLACE. Change the battery as soon as possible.
NOTE: The tester retains setup information while you change the 9-volt
battery.
1. Turn the tester face down.
2. Remove the screw securing the battery compartment cover using a
small Phillips screwdriver.
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