Huawei G510 - Page 76

G510 Maintenance Manual V1.0
INTERNAL
2013-01-28
Huawei Confidential
Page 76 of 96
Figure 9-38 Troubleshooting process when the G510 fails to detect the UIM card
The U8825-1 fails to
detect the UIM card.
Can the mobile
phone detect
the UIM card
after UIM card
replacement?
Y
End
N
Is the UIM card
slot normal?
N
Re-solder or
replace the UIM
card.
Y
Is the VDD_SIM
normal?
N
Check the
VDD_SIM.
Y
Return the U8825-1
to Huawei for repair.
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
Level
Interface Signal
Between the PM8029
and USIM Card
Level
N/A
VREG_S3
UIM1_RESET
VREG_L16_UIM1
(set using the
software)
UIM1_MSM_CLK
UIM1_CLK
UIM1_MSM_DATA
UIM1_DATA