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LO Get sxiit)
| t
|
5V
OV
T=500 psec
Fig. 68
4)
Use an oscilloscope to observe the signal at pin 3 of connector CN5 on the processor board.
T=500 psec
5V
-12V
Fig. 69
the processor board has failed.
Possible Causes
oO
Improper operation of externally connected loran system
fe)
Improper connection of interface cable with loran system
fe)
Failure of photocoupler IC44 used for interface
fe)
Microcomputer IC1 failure
Checks
1)
Check that the loran system is functioning properly.
failed.
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