1101/1201 Technical Manual
07/19/02 Page 4 1201 - JULY 19 '02
2. Troubleshooting
In order to isolate the problem quickly it always helps to have as much relevant data as possible
about the vessel and its’ accessories. The Problem Solving Guide Form (see Appendix A) can be
used to compile all the necessary information together.
**If an alarm occurs, the Error Checking section in the users manual should be consulted.**
2.1 Problems during initial Dockside Setup:
A. Autopilot does not turn on
1. Check for power in the Distribution box terminals labeled POS and GND for correct
voltage. This voltage should be the same as the voltage across the terminals on your
batteries.
2. Make sure the main plug is properly plugged into the back of the Autopilot receptacle
labeled “Distribution Box”
3. Check the Fuse. If the fuse is blown, check the polarity of Power input cable, making sure
the battery positive goes to the terminal marked POS. and the Battery negative goes to the
terminal marked GND. Replace the blown fuse.
B. Autopilot displays Redo Rudder Setup
1. With the unit in STBY mode, measure the feedback signal for the voltage between the
terminal marked +5V and POS’N in the Distribution box. When rudder is in Dead Ahead
position you should read 2.5 Volts.
2. Check that the Rudder Follower Arm is above the cable gland when rudder is Dead
Ahead.
3. Check for continuity of Rudder Feedback cable. Rectify as necessary and restart the
setup process by switching the pilot off and then performing a full reset. Complete the
dockside setup.
2.2 Circuit Board Repairs:
The circuit boards in the 1101/1201 SPU are delicate, and can be damaged if not handled
properly. The most chance of damage occurs in the process of replacing components. Following
the proper procedure as outlined below will minimize the chance of damaging the circuit board.
When handling circuit boards from the 1101/1201 Autopilot you should always use static
prevention measures, especially while repairing a circuit board. This consists of a grounded mat
for working on, the use of a soldering iron with a grounded tip and the wearing of a grounded
wrist strap. Failure to observe these procedures could cause additional damage to the CMOS
circuitry present on most of the circuit boards.
The best type of soldering iron to use is one with a thermostatically controlled tip. We recommend
using an 800 degree Fahrenheit tip. For desoldering, we recommend using a vacuum desoldering
tool such as a "Soldapult." Heat the joint until the solder is molten, if necessary adding a little
fresh solder, and then place the tip of the desoldering tool over the joint and activate it. If the joint
is not completely cleaned (you should be able to see through the hole), then resolder the joint and
try again. NEVER use the desoldering tool twice without resoldering the joint in between. When
all the pins of the device to be removed are desoldered, free them by wiggling with a pair of pliers
or an "Exacto" knife. Properly done, you should then be able to lift out the device by hand. Insert
the new device, and resolder carefully, making sure that each joint is fully soldered.
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