Furuno CH-270 Service Manual page 47

3) Soundome Raising Check
Up LED blinks and then lights?
#2 of J2 on CPU board is Low
Measure voltage at collector of Q1
on DRV board 06P0154.
10.8V to 15.6V for 12V set and
21.6V to 31.2V for 24VDC set?
Measure voltage across the motor
lead wires.
10.8V to 15.6V for 12V set and
21.6V to 31.2V for 24VDC set?
START
Press UP arrow key.
No
Yes
Check fuse F1.
No
OK?
Yes
Yes
Yes
Motor is faulty.
Yes
END
CPU DSP board is faulty.
Problem is cleared by
changing F1?
Yes
END
No
U9, U7 or Q1 on
06P0154 is faulty.
No
Relay K1 or limit
switch S2 is faulty.
44
No
Check motor for
short circuit.