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CONTENTS - TM-5-4210-230-14P-1_549
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OPERATION - TM-5-4210-230-14P-1_552
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 Fig. 1  Schematic View of Ignition System 1. Battery 5. Trigger Wheel 2. Ignition Switch 6. Electronic Control 3. Ignition Coil 7. Sensor 4. Spark Plug 8. Air Gap DESCRIPTION The   electronic   (breakerless)   ignition   system   (Figure 1)consists of two major component units-a distributor and an ignition coil.  These units are shown in Figure 2. Fig. 2 Major Components of Ignition System 1. Ignition Coil   3. Electronic Control 2. Trigger Wheel Unit 4. Distributor The   distributor   is   conventional   except   that   a   trigger wheel and an electronic control unit (circuit board and sensor) replace    the    usual    distributor    cam,    contact    points    and condenser.  A standard type ignition coil is used. The electronic control unit (Figure 3) is associated with the  primary  (low  voltage)  section  of  the  ignition  system.  The control  unit  electronically  "makes"  and  "breaks"  the  ignition primary circuit in response to rotation of the trigger wheel. Fig. 3 Electronic Control Unit (Circuit Board, Sensor and Plate Assembly) 1. Sensor 3. Mounting Plate 2. Sensor Plate 4. Electronic Circuit Board The control unit circuit board is a completely solid state unit    designed    for    trouble    free    service.        Its    electronic components   are   permanently   sealed   in   a   waterproof   and vibration resistant compound. The sensor is a small coil, wound of fine wire, which is very   simply   a   metal   detector.      The   metal   that   the   sensor detects is the teeth of the trigger wheel. The electronic circuit board and sensor are mounted on the distributor plate assembly.  The sensor leads are soldered directly to the circuit board. The electronic control unit (circuit board,   sensor   and   plates)   is   provided   for   service   'as   a complete assembly.    CGES-145-U  Page 3 PRINTED IN UNITED STATES OF AMERICA

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