LG KT520 Service Manual page 153

4. TROUBLE SHOOTING
Check the pk-pk level at
R206 ,R207, R208, R209
With Oscilloscope.
Refer to Figure 4-36-1
Check the Mean level at
R206 ,R207, R208, R209
With Oscilloscope.
Refer to Figure 4-36-1
Check the frequency at
R206 ,R207, R208, R209
With Oscilloscope.
Refer to Figure 4-36-2
Verify whether the signal
was similar as Figure
4-36-2 with Oscilloscope.
LGE Internal Use Only
Set the CW Mode of the Agillent 8960
Feed a CW signal at 2142MHz
Set the RX Continuous mode
About 130mVp-p?
Yes
About 160mV?
Yes
About 2MHz?
Yes
Similar?
Yes
Check Next Stage
- 154 -
TP Command
MODE=4
WRXC=10700
No
Change RF3100 (U204)
No
Change RF3100 (U204)
No
Change RF3100 (U204)
No
Change RF3100 (U204)
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Only for training and service purposes