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Getting Started
POWERING THE TESTER
The Mastertech can be powered by the vehicle 12-volt battery, by the AC 12-volt power supply, or by the
internal battery pack.
NOTE
VEHICLE BATTERY
• On some vehicle systems, the tester is powered directly by the DLC cable when the cable is connected to
the vehicle DLC.
• If the tester is not powered directly by the vehicle DLC, connect the DC Power Cable to the right side of
the tester or to the DC port on the 26-Pin end of the DLC Cable. Insert the cigarette lighter plug into the
vehicle cigarette lighter socket or the optional Battery Adapter Cable.
To use the optional Battery Adapter Cable, connect the red clip to the positive (+) battery post and the
black clip to the negative (-) post. Insert the cigarette lighter plug end of the DC Power Cable into the
cigarette lighter socket on the Battery Adapter Cable.
AC 12-VOLT POWER SUPPLY
Connect the AC 12-volt power supply to the right side of the tester, then plug the power supply into a
standard wall outlet.
BATTERY PACK
Press the o key to power the tester via the internal battery pack. When the tester is powered by the
battery pack, the display backlight will go off after one minute if there is no key press. The automatic shutoff
preserves the battery charge. Once the backlight goes off, it can be turned on again by pressing any key.
NOTE
Page 5-4
The right green LED is illuminated when the tester is connected to external
power but has not been turned on.
The battery pack is trickle charging when the tester is connected to any of
the power sources listed above.
Mastertech 3100 Operator's Manual
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