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Autohelm
SeaTalk Service Manual
2
1. Type CR Interface Box PCB Circuit Description
The course computer clutch signal activates RLY1 which in turn supplies current to a
bypass valve, if fitted. D1 suppresses any inductive spikes produced when the valve
is switched and D2 protects against supply misconnection.
Each solenoid drive is derived by connecting one side of the solenoid to a motor
terminal and the other side to 0V.