TMQ AP4 - Troubleshooting

TMQ AP4 Autopilot (AP4S10) 60 of 62 Version 4.96 9/10/2017
Troubleshooting
Note: Before carrying out any trouble shooting procedures, ensure your test
equipment is working correctly!!
AP4 does not switch on:
Possible fault
 No power available at AP4
 Defective power cable connection
 Faulty Mode switch on AP4
 Component failure in AP4 power regulator circuit
AP4 switches on but no drive output
Possible fault
 No compass input
 Defective drive cable connections
 Failure of drive switching circuit in AP4 (FET’s)
 Defective MODE switch in AP4
 FUS Displayed open Fuse Internal 15A Blade Fuse
AP4 working but rudder does not move
Possible fault
 Defective drive connection cable
 Worn drive motor brushes
 Drive motor failure
 Pump failure (hydraulic drive)
 Air in hydraulic lines
 Ram connection on tiller
 Broken drive chain or cable (mechanical drive)
 FUS Displayed open Fuse Internal 15A Blade Fuse