Garmin APOLLO GX SERIES, Service Manual

Page: 82 / 166

Garmin AT Rev --
7-44 GX Service Manual © 2004 Garmin AT
2. Receiver Tests Using the HP8920 Test Set
Headset Output Level
Step General Instruction Specific Instructions Expected Results
1 Set all test
equipment as
specified in Test
Equipment Setup on
page 7-17.
2 Sig. Gen. Mod Lvl.
To 85%.
Amplitude to 1000
µV.
On the HP8920:
1. Set AFGen1 to AM 85%.
2. Set AMPLITUDE to 1000
µV.
3. Set Ext. Load R 100 ohms.
4. Set the Comm radio
HDPHONE Lvl to 000.
3 Move test cable. On the test box connect the
HP8920 audio in cable to HDPH
4 Adjust volume
control on Comm
radio for 0.280 W.
On the Comm radio, adjust the
volume control until the AC Level
reads 0.280 watts. ≥ 0.280 watts output into 100
ohm load (mounted in test
fixture) at a volume level from 0
to 280 mW.
Speaker Audio Level
Step General Instruction Specific Instructions Expected Results
1 Set all test
equipment as
specified in Test
Equipment Setup on
page 7-17.
2 Sig. Gen. Mod Lvl.
To 85%.
Amplitude to 1000
µV.
On the HP8920:
1. Set AFGen1 to AM 85%.
2. Set AMPLITUDE to 1000
µV.
3. Set Ext. Load R 4 ohms.
3 Move test cable. On the test box, connect the
HP8920 audio in cable to SPKR
OUT.
4 Adjust volume
control on Comm
radio for 12 W.
On the Comm radio, adjust the
volume control until the AC Level
reads 12 watts. ≥ 12 watts output into 4 ohm
load (mounted in test fixture) at
a volume level from 0 to 12
watts.