Garmin GPS 155 Repair Manual page 23

c. Observe the test patterns and verify that the display is working properly.
d. Rotate the power/dimmer knob counterclockwise, but not past the detent (off) position, to ensure that
the display is dimmable.
2. CDI Deflection Test:
a. Rotate the outer function knob clockwise. The CDI Test Page will be displayed:
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b. Turn the FUNCTION SELECT switch on the test panel to position #3.
c. Press the CRSR key.
d. If necessary, rotate the inner function knob to select CENTERED. Verify that the DMM voltage is 0 ±15
millivolts.
e. Rotate the inner function knob clockwise to select FULL RIGHT. Verify that the DMM voltage is -150 ±15
millivolts.
f. Rotate the inner function knob clockwise to select MAX RIGHT. Verify that the DMM voltage is
-300 ±30 millivolts.
g. Rotate the inner function knob clockwise to select MAX LEFT. Verify that the DMM voltage is +300 ±30 millivolts.
h. Rotate the inner function knob clockwise to select FULL LEFT. Verify that the DMM voltage +150 ±15 millivolts.
3. CDI To/From Flag Test:
a. Rotate the outer function knob clockwise.
b. Turn the FUNCTION SELECT switch on the test panel to position #2.
c. If necessary, rotate the inner function knob to select FLAG. Verify that the DMM voltage is 0 ±15 millivolts.
Units with Mod Status 1: DMM voltage is 0 ±10 millivolts.
d. Rotate the inner function knob clockwise to select FROM. Verify that the DMM voltage is -83 ±20 millivolts.
Units with Mod Status 1: DMM voltage is -190 ±40 millivolts.
e. Rotate the inner function knob clockwise to select TO. Verify that the DMM voltage is 83 ±20 millivolts.
Units with Mod Status 1: DMM voltage is +190 ±40 millivolts.
4. CDI Nav Flag Test:
a. Rotate the outer function knob clockwise.
b. Turn the FUNCTION SELECT switch on the test panel to position #1.
c. If necessary, rotate the inner function knob to select IN VIEW. Verify that the DMM voltage is 0 ±10 millivolts.
d. Rotate the inner function knob clockwise to select OUT OF VIEW. Verify that the DMM voltage is
375 ±80 millivolts.
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