LG GD580 Service Manual page 153

4. Trouble Shooting
Check the pk-pk level at
PIN 1, PIN 2, PIN 3, PIN 4
With Oscilloscope.
Refer to Figure 4-18-14
Check the Mean level at
PIN 1, PIN 2, PIN 3, PIN 4
With Oscilloscope.
Refer to Figure 4-18-14
Check the frequency at
PIN 1, PIN 2, PIN 3, PIN 4
With Oscilloscope.
Refer to Figure 4-18-15
Verify whether the signal
was similar as Figure
4-18-15 with Oscilloscope.
LGE Internal Use Only
Set the CW Mode of the Agillent 8960
Feed a CW signal at 1950MHz
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=9750
No
Change RF3100 (U106)
No
Change RF3100 (U106)
No
Change RF3100 (U106)
No
Change RF3100 (U106)
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Only for training and service purposes