Huawei G510 Maintenance Manual page 55

Figure 9-22 Troubleshooting process when the G510 fails to receive signals
NOTE
Use the multimeter or oscilloscope to check that U3202's control signals are normal. Table 9-3 is the
truth table of the control signals.
2013-01-28
G510 Maintenance Manual V1.0
The WCDMA 2100 MHz receive
channel is faulty.
Check U3301 before the
RF cable is connected.
Are pin 1 and pin 2 of
U3301 properly
connected?
Y
Are the control signals of U3302
normal? (See Table 9-3 for the
truth table.)
Y
Are signals output from pin 1 and
pin 8 of U3304 normal? (The
insertion loss must not exceed
2.3 dB.)
Y
Are I/Q signals and power
voltage of U3801 normal?
Y
Check U401.
Y
End
Huawei Confidential
N
Check U3301.
N
Check U3302 and
U401.
N
Check U3304.
N
Check U3801.
Page 55 of 96
INTERNAL