Huawei G510 Maintenance Manual page 76

Figure 9-38 Troubleshooting process when the G510 fails to detect the UIM card
Circuit Symbols
The PM8029's MPP pin converts the level for the PM8029 to connect to the SIM card.
The level VREG_L16_UIM1 ranges from 1.5 V to 3.05 V. The operating level of the USIM
card port is 1.8 V or 3.0 V. Table 9-4 lists PM8029-provided interface signals for converting
the USIM card level.
Table 9-4 Interface signals for converting the USIM card level
Interface Signal Between
the PM8029 and
MSM8225
N/A
UIM1_MSM_CLK
UIM1_MSM_DATA
2013-01-28
G510 Maintenance Manual V1.0
The U8825-1 fails to
detect the UIM card.
Can the mobile
phone detect
the UIM card
after UIM card
replacement?
N
Is the UIM card
slot normal?
Y
Is the VDD_SIM
normal?
Y
Return the U8825-1
to Huawei for repair.
Level
VREG_S3
Huawei Confidential
Y
End
N
Re-solder or
replace the UIM
card.
N
Check the
VDD_SIM.
Interface Signal
Between the PM8029
and USIM Card
UIM1_RESET
UIM1_CLK
UIM1_DATA
INTERNAL
Level
VREG_L16_UIM1
(set using the
software)
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