Filter
Top Products
4. TROUBLE SHOOTING
- 111 -
4.18 Speaker phone path
MSM6245 LINE_P,LINE_N → R429/R427, C423/C422, R431/R426 → Audio AMP(U402) → Analog
Switch(U401) → Speaker
Start
Connect the phone to network
equipment and setup call
Setup 1KHz tone out
Sine wave appears at
R429/R427 and C423/C422
Change the Main board
NO
SPK_AMP_EN is
2.6V?
Change the Main board
NO
YES
The sine wave appears at
SPK_RCV-,SPK_RCV+?
YES
NO
Change speaker
YES
Change the Main board
The sine wave appears at
SPK+, SPK- ?
Change the Audio Amp
NO
YES
And R431/R426 ?
Can you hear the tone?
YES
NO
END