LG KU580 Service Manual - Page 99

at C633,C634?

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4. TROUBLE SHOOTING START Connect the phone to network Equipment and setup call Setup 1KHz tone out NO 1 Does the sine wave appear at C633,C634? Change the main board YES Does the sine wave appear 2 at U602 ? The sine wave not appear NO Change the U600 YES 3 Does the sine wave appear at C633,C634 ? NO Change the main board YES NO 4 Does the sine wave appear At ZD501,ZD502? Change the main board YES 5 Can you hear sine wave out of a speaker ? NO Change each Speaker YES END LGE Internal Use Only - 100 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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- 100 -
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc.
All right reserved.
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 C633,C634?
Change the main board
Does the sine wave appear
at U602 ?
Change the U600
Does the sine wave appear
at C633,C634 ?
YES
YES
YES
YES
NO
NO
NO
NO
Can you hear sine wave
out of a speaker ?
Change each Speaker
END
YES
NO
Change the main board
Does the sine wave appear
At ZD501,ZD502?
1
4
3
2
The sine wave not appear
5
Change the main board