Mic ETS2228 User Manual download pdf (Page 30)

ETS2228 Maintenance Manual

Chapter 5 Troubleshooting

（1）Troubleshooting Procedure of the Baseband

1、Power fault maintenance procedure

Figure 11 Power fault maintenance procedure

YES

power-on and startup

Check if Q301 is

good.

Chiefly check if CE

junction of Q301 is good

Check if

TL494(U302)

is good

Check if the voltage of foot 4 of

U302 is 5V.

Check if the voltage of

foot 4 of U302 is 1.25V.

Check if

R312(0.1ohm) is good

Check if D304 is good

End

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Mic ETS2228 User Manual Page 30