-39-
PRO
PILOT
725 INSTALLATION & SERVICING MANUAL
Changing
Software
Eproms
Caution!
Eproms are Static
Sensitive Devices.
Take suitable
precautions when
handling them.
System Description
Operating Temperature (Ambient):
0 to 55°C
The software is stored in the EPROM, IC 11. To change the
eprom, first disconnect any power to the Distribution Box.
Remove the cover and internal RFI shield. IC11 is located in the
centre of the PCB, replace the existing eprom with the new one,
being certain that pin 1 is in the correct position (away from the
motor connection block) and that no pins are bent or miss their
socket. Refit the RFI shield and cover.
Restore the power supplies and turn the autopilot on. The
display may show system fault ‘F002’ to start with. If it does,
switch the autopilot Off then On again and this should clear the
condition. If it does not then almost certainly the eprom has not
been fitted correctly.
Switches
There is an eight way DIL switch on the PCB which is used to
change the way the Distribution Box functions. It is situated in
the top right quadrant of the PCB with switch one (SW1) being
nearest the centre of the board. The ON position is defined as
when the switch is pushed towards the FET’s.
The functions of the switches are as follows:
SW1
Leave in ON position. (First 930 725 or 930 750 must be
connected to Port A.)
SW2
Switch to the ON position when a 930 725 or 930 750 is
connected to Port B.
Switch to the OFF position when Port B is not connected or
when a 930 700 or 930 770 is connected to Port B.
SW3
Switch to the ON position when a 930 725 or 930 750 is
connected to Port C. Not available if a 930 700 or 930 770 is
connected to Port B.
Switch to the OFF position when Port C is not connected.
SW4
Leave in OFF position.
SW5
Switch to the ON position when using a Rudder Feedback Unit
that has no integral limit switches, i.e. 930 807.
Switch to the OFF position when using a Rudder Feedback Unit
that has integral limit switches, i.e. 930 801.
