Huawei U8185 Maintenance Manual page 69

U8185
Maintenance Manual
Table 9-6 Circuit diagram signal summary
Signal
VREG_L16_RUIM
UIM1_DAT A
UIM1_DAT A_ESD
UIM1_RESET
UIM1_RESET_ESD
Issue 1.0 (2012-03-23)
UIM card not detected
Replace the UIM card.
Problem solved?
N N
Is the UIM card slot
soldered properly?
Y Y
Is VREG_L16_UIM1
normal?
Y Y
Is cover B's fabrication
error too serious?
Y Y
Send the phone to an
advanced service site
for repair
Description
Supplies power to the UIM card.
UIM card data signals

ESD protection for UIM card
data signals

Connected to the ESD
protection component D606
 UIM card reset signal

Valid at high level

Kept at low level after the
phone is powered on.

ESD protection for the UIM
card reset signal

Connected to the ESD
protection component D606
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End
Y Y
Re-solder or replace
N N
the UIM card slot
Make further analysis
N N
Replace cover B and
sent it to mechanical
Y Y
design department for
analysis
Reference Measurement or Wave Form
2.85v
None.
None.
9 Principles and Failure Analysis
64