Furuno CH-270, Service Manual

Page: 45 / 88

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