WAVEFORM CHECK USING AN OSCILLOSCOPE


EXAMPLE OF ABNORMAL WAVEFORMS


note
  1. The size of the waveform patterns differs largely, depending on the adjustment of the variable knob on the oscilloscope.
  2. Identification of abnormal waveforms is easier when there is a large output current (regulator is not operating). (Waveforms can be observed when the headlamps are illuminated.)
  3. Check the conditions of the charging warning lamp (illuminated/not illuminated). Also, check the charging system totally.

<4N1>
Abnormal waveform
 Problem cause
Example 1

Open diode
Example 2

Short in diode
Example 3

Broken wire in stator coil
Example 4

Short in stator coil