1992 Johnson Evinrude "EN" 60 thru 70 Service Manual, P/N 508144, Page 108Get this manual
Power PackThe power pack has five basic functions: The power pack receives the charge coil output and coverts it to direct current The power pack stores the direct current in capacitor The power pack directs the capacitor output to the ignition coil primary windings through series of electronic switch (SeR's)The SeR's are controlled by the sensor coil output The power pack incorporates the S.L.oWTM warning system, which gradually limits engine speed to approximately 2500 RPM if engine temperature exceeds 240 (1140 e)Once the S.LOWsystem has activated, the engine must cool to 20r (110 e) and be turned off before normal operation can be resumed The power pack has an RPM limiting circuitThis circuit helps protect against powerhead failures caused by excessive RPM operationSome causes of excessive RPM include under propping, excessive wear to propeller blades, ventilation of propeller, improper motor installation, and unusually light loadStop Circuit stop buttonkey switchand emergency stop switch Q) are connected to the power pack through the engine wiring harnessWhen activated, these switches direct the power pack output to ground, stopping the ignition system Ignition Coil f41 The ignition coil consists of two windings of wire wrapped around compacted ferrite coilThe coil has primary and secondary terminal connections and ground plateThrough mutual induction, the ignition coil transforms the power pack output to as much as 40,000 volts to fire the spark plugs There is one ignition coil per cylinder Isllsl The