Silva NX2 - Page 30

62trshotnx2.doc Page 4 Latest update: 14 Feb -03
Fault
indication
Check
signal at:
Possible
reason if not
Correct
waveform
DMM test. Oscilloscope
Correct wave form
No Compass
value
TP CA
TP CB
U8 Pin 4 =
chan.A
pin12 =
chan.B
No NMEA
out signal on
Term. 3
TP 12
NMEA out
terminal 3
on J1A
If no NMEA
signal on
TP12 check
TP13 if OK
signal defect
U11
No NMEA
out signal on
D-sub pin 2
TP 14
NMEA out
signal on
D-sub pin 2
If no NMEA
signal on
TP14 check
TP13 if OK
signal defect
U 5
NMEA in test
Connect
term.3
NMEA out
to NMEA in
term. 10 +
11 to
ground and
check at TP
15
Optocoupl.
U12 pin 6.
If no NMEA
signal on
TP15, defect
U 12, Q2, Q3
or D5.