Motorola A3100 Troubleshooting Manual page 27

• Using the oscilloscope to see if the waveform is visible at C233, if
not, replace U1 with a new chip.
• Using the oscilloscope to see if the waveform is visible at L15 & L14,
and the two waveforms should be out of phase with each other, if
not, replace U2 with a new chip.
• Using the oscilloscope to see if the waveform is visible at S1 & S2, If
yes, check if the sprints of S1 & S2 are distorted.
• If the sprints are in good shape, replace the speaker.
Service Engineeing & Optimization
Level 3 , Rev.1.0
Speaker Malfunction (1)