Onwa KR-1338 Service Manual page 47

Flow chart 4
All data shown by asterisks or blank.
Nav data indication.
Some data shown by
asterisks or blank.
Check nav equipment's
output sentences.
NG
OK?
OK
Select sentences to be output.
Wrong data sentence format
selected at input or output
side.
Symptom: No nav data.
Check RD NMEA 1 / 2
connector on display unit
with oscilloscope.
NG
OK?
OK
Faulty pcb MAIN-0910
or NMEA 0183 not
selected at nav equipment.
Faulty nav equipment or
interconnection cable.
43