LG KU580 Service Manual - Page 143

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4. TROUBLE SHOOTING Set the CW Mode of the Agillent 8960 Feed a CW signal at 2142MHz Set the RX Continuous mode Check the pk-pk level at No R124 ,R127, R128, R129 With Oscilloscope. About 130mVp-p? Refer to Figure 4-36-1 Yes Check the Mean level at No R124 ,R127, R128, R129 With Oscilloscope. About 160mV? Refer to Figure 4-36-1 Yes Check the frequency at No R124 ,R127, R128, R129 With Oscilloscope. About 2MHz? Refer to Figure 4-36-2 Verify whether the signal was similar as Figure 4-36-2 with Oscilloscope. Yes No Similar? Yes Check Next Stage TP Command MODE=4 WRXC=10700 Change RF3100 (U104) Change RF3100 (U104) Change RF3100 (U104) Change RF3100 (U104) LGE Internal Use Only - 144 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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- 144 -
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
About 130mVp-p?
Change RF3100 (U104)
Check the pk-pk level at
R124 ,R127, R128, R129
With Oscilloscope.
Refer to Figure 4-36-1
Yes
No
Set the CW Mode of the Agillent
8960
Feed a CW signal at
2142
MHz
Set the RX Continuous mode
Check the Mean level at
R124 ,R127, R128, R129
With Oscilloscope.
Refer to Figure 4-36-1
Yes
No
Check the frequency at
R124 ,R127, R128, R129
With Oscilloscope.
Refer to Figure 4-36-2
Yes
No
Verify whether the signal
was similar as Figure
4-36-2 with Oscilloscope.
Yes
No
About 160mV?
About 2MHz?
Similar?
Check Next Stage
Change RF3100 (U104)
Change RF3100 (U104)
Change RF3100 (U104)
TP Command
MODE=4
WRXC=10700