Garmin APOLLO GX SERIES Service Manual - page 73
Garmin AT
Rev --
© 2004 Garmin AT
GX Service Manual
7-35
Step
General Instruction
Specific Instructions
Expected Results
13
On the test box, press the PTT
switch to RX
This reading may be modified
by customer
Microphone Bias
Step
General Instruction
Specific Instructions
Expected Results
1 Set
all
test
equipment as
specified in Test
Equipment Setup on
page 7-17.
2 Remove
test
equipment load.
Disconnect the 8920 AUDIO
OUT cable from the test box. Put
the TEST1 MIC1 switch in MIC1.
3
Measure the DC
voltage at the test
station MIC1 BNC
connector (1 k ohm
load is in test
station).
Use the FLUKE 8010A on DC
scale to measure the voltage at
MIC1 BNC center pin. The
positive lead to center pin of
BNC connector the negative
lead to fixture ground.
The voltage at MIC1 and MIC2
BNC connectors will be 6.3
volts ± 0.4 V.
4
Repeat this test with MIC2.