VAL AVIONICS LTD
VAL AVIONICS LTD
VAL AVIONICS LTD
VAL AVIONICS LTD
AWOS 2000
AWOS 2000
AWOS 2000
AWOS 2000 –
–
–
– VHF TRANSMITTER
VHF TRANSMITTER
VHF TRANSMITTER
VHF TRANSMITTER
MAINTENCE AND REPAIR MANUAL
MAINTENCE AND REPAIR MANUAL
MAINTENCE AND REPAIR MANUAL
MAINTENCE AND REPAIR MANUAL
Revision 1
Page 8 of 13
April 2012
2
Troubleshooting
2.1 Troubleshooting Equipment Required
•
0 to 30V DC/5 amp power supply
•
Digital multimeter
•
20MHz oscilloscope
2.2
Initial Troubleshooting Operations
The first step in troubleshooting the AWOS 2000 is to remove the cover
assembly (see Section 3.1) and verify the unit as being properly powered.
2.3 Power Supply Check
1. Check the DC voltage between U119 pin 3 and ground. The voltage
should be between 4.5 and 5.5V. If the voltage is out of limit specified
replace the main board.
2. Check the DC voltage between L107 and ground. The voltage should be
between 11 and 13V. If the voltage is out of limit specified replace the
main board.
2.4
Troubleshooting Chart
PROBLEM
RECOMMENDED ACTION
Unit will not power on
Check external power connection
Send unit for Service
Weak or garbled transmit
Replace antenna and/or antenna cable
Send unit for Service
Weak or no modulation
Adjust modulation setting
Replace antenna and/or antenna cable
Send unit for Service
