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Mastertech Kit Components
LEDs
Eight Light Emitting Diodes (LEDs), four red and four green, are located immediately below the display and
are visible only when activated. The green light on the right is lit when the tester is in battery charge mode
while the display is off.
In the display below, the green LED beneath KNOCK RETARD will be on when KNOCK RETARD is on
and the red LED will be on when KNOCK RETARD is off.
For switched signals, such as A/C or Brake Switch, RED means OFF and GREEN means ON.
= Red
= Green
FIGURE 3-5. LEDs
Page 3-8
Mastertech 3100 Operator's Manual
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