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Only for training and service purposes
4. TROUBLE SHOOTING
START
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Does the sine wave appear
at C343(TP1),C344(TP2)?
Change the main board
Does the sine wave appear
at U301 ?
Change the U301
Does the sine wave appear
at R352(TP3),R353(TP4) ?
YES
YES
YES
NO
NO
NO
Can you hear sine wave
out of a speaker ?
Change each Speaker
END
YES
NO
Change the U301
1
3
2
The sine wave not appear
4
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