Furuno CH-270 Service Manual page 45

Check the train motor drive pulse outputs on
DRV board 06P0154 .
01 : Q9 (C)
02 : Q8 (C)
03 : Q7 (C)
04 : Q6 (C)
Check result is OK?
Check TR CLK and TR CW/CCW inputs on
DRV board 06P0154.
TR CLK : U5 #3 (sig) J1 #20 (com)
TR CW/CCW : U5 #4 (sig) J1 #20 (com)
Check result is OK?
Q5 or Q6/Q7/Q8/Q9 is faulty.
Common is (-) of
ship's supply.
Yes
No (Driver circuit is faulty.)
Yes
Check wiring between the transceiver unit
and the hull unit
42
+8ms
+45V
0V
Drive Circuit is OK.
(Train Motor or Feedback Circuit is faulty.)
2ms
+4.5V
TR CLK
0V
CW : t4.5V
TR U/D
CCW : 0V
No