User Guide
RH-4 Company Confidential
BB Description & Troubleshooting CCS Technical Documentation
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SIM
card
Insert
SIM card
faults?
Set phone
LOCAL MODE.
Is it OK?
Measure
VSIM voltage
from X387.
Is it 3V?
Check SIM
power Up sequency.
Is it OK?
Check X387
Check BSI line,
X103, C100, R202,
C240, R206.
If ok change UEM.
Check VSIM line,
X387, C390, C203.
If ok change R388.
If still wrong VSIM
voltage change UEM
Check SIM lines.
If OK change R388.
If still fail change
UEM.
Change UPP
End
Yes
No
Yes
No
Yes
Yes
No
No