Furuno FR-1500 MARK-3 Series Service Manual

5-10
Symptom: Poor sensitivity
FR1710-SME-68
Flow chart 8
Less than
2000 hrs ?
OK
No echo; poor
sensitivity.
No echo (White noise appears)
Check TOTAL ON
TIME/TOTAL TX TIME.
Rating ?
OK
Check if display unit
outputs TX trigger.
(DJ-1 #4)
DJ-1#7 is normal ?
OK
Check TUNE voltage
output from display unit.
Manual Tune Voltage :
about2Vto32V
TUNE IND voltage in manual mode ;
about 1 to 3 V
In manual mode, rotate
TUNE VR and check
the voltage.
NG
Poor sensitivity
NG
(No TX trigger)
Faulty pcb 03P9230.
NG
Faulty pcb 03P9230.
0V
approx. 12V
Replace
magnetron.
To 1)
(page 5-11)
OK
Faulty pcb 03P9230.
NG
0V
approx. -4V
TP1 on SPU ?
OK
To 2)
(page 5-12)
NG
OK
NG
Manual tuning ?
Check maximum. gain is
obtained with maximum
tuning indication.
OK
NG
OK ?
Defective IF amp.
Defective MIC
OK
NG
Perform Tuning
Initialization.
Defective IF amp.,
MIC, or SPU board.
Defective EEPROM,
Defective back-up ckt
Check input video
signal at U90 #1 on
SPU.
OK?
Defective IF AMP (03P9232)

Furuno FR-1500 MARK-3 Series Specifications

General

Brand	Furuno
Model	FR-1500 MARK-3 Series
Category	Marine Radar
Language	English