Cd Unit; Ignition Coil; Main Key Switch And Emergency Stop Switch - TOHATSU NB-1000 Service Manual

CD Unit

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The CD Units incorporate a printed circuit board (PCB) encased in a
black resin housing to protect the circuitry from water and vibration.
Major components include a diode used to rectify current generated
by the exciter coil, a capacitor which charges the voltage supplied, a
thyristor which serves as a breaker and a zener diode used to control
the thyristor. Additional components such as resistors and SCR's are
also provided depending upon the model.

Ignition Coil

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Each ignition coil (4) consists of two windings or wire wrapped
around a compacted ferrite material. The coil has a primary and
secondary terminal connection and a ground plate. Through mutual
induction, the ignition coil transforms the output from the CD Unit
to as much as 20,000 - 30,000 volts to fire the spark plug. The
ignition coil is generally adjacent to the CD Unit and attached to its
mounting bracket, with the exception of the 8/9.8 CD Unit where
the ignition coil is molded as together as part of the CD Unit.

Main Key Switch and Emergency Stop Switch

The emergency stop switch is connected to the CD Unit through an
engine wiring harness. When lanyard is removed from the
emergency stop switch, an input to the CD Unit is grounded. This
deactivates the CD Unit and the engine shuts down. If the engine is
fitted with the Remote Control feature, pressing the stop switch on
the Remote Control Unit will also ground the CD Unit.
1-/ 2-Cylinder
ELECTRICAL SYSTEM
7-15