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Only for training and service purposes
4. TROUBLE SHOOTING
4.13 Main microphone
MIC501 Æ VMIC_BIAS_P(TP1_C526) Æ MAIN_MIC_P(TP2_C261) Æ MIC1P PAD of QSC6270(3G disable)
Make a call
MIC_BIAS(TP1_C526)
is about 1.8V?
Yes
Change the Main board
No
Sine wave appears at
TP2_C261?
Change the MIC
START
Make sound to MIC
Yes
No
Change the Main board
Work well?
Yes
END
No