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.V1AAW iLiiriiSOL
WJ-tt/18-19/tJi Hi- RECEIVER
4.3.4.27
Asynchronous I/O, A6A3, (796037) Testing and Troubleshooting
Asynchronous I/O Testing and Troubleshooting includes a checkout
procedure and fault isolation information.
A Digital Voltmeter and a wideband
Oscilloscope (Table 4-1) are required to perform the tests outlined below.
The testing and troubleshooting information in this paragraph is keyed to
several fault isolation tables.
These tables are used to isolate the module fault to a
defective integrated circuit or functional group of integrated circuits.
Perform the
following procedure in the sequence given.
When a faulty signal is encountered,
replace the key components indicated in the table.
1.
Deenergize the receiver.
2.
Remove the receiver top cover.
3.
Place module A6A3 on an extender card.
4.
Connect a remote controller to rear panel REM IN
connector, J14.
5.
Set the receiver to the following parameters:
a.
Tuned Frequency
—
15.00500 MHz
b.
Bandwidth
50 kHz
c .
Gain Mode
AGC FAST
d.
Detection Mode
—
AM
e.
Tuning Rate
Disable
Using the oscilloscope, verify the UART and I/O
signal/data activity using Tables 4-34 and 4-35.
Activity should be checked in conjunction with sending
commands from a remote terminal.
Table 4-34. UART Control Signal/Data Activity Check
Test i Point
Normal Signal
Key
Coi
nponent
Comments
Ul-3
Square wave
pulse train
U9
Send command from
terminal to rcvr
Ul-17
High pulse when
data is sent
U9
m
Ul-19
Square wave
Ul
Present when rcvr
pulse train
transmits to terminal
4-52
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