Nokia 3105 Servicehandbuch
RH-48
Troubleshooting — BB
CCS Technical Documentation
Page 38
©
2003 Nokia Corporation Confidential
Issue 1 11/2003
Power doesn‘t stay on or the phone is jammed
Phone is
jammed
Measure VIO,
VCORE, VFlash1,
VANA, and VR3
voltages. Are they
OK?
Measure 32kHz
Sleep Clk from
testpoint. Is it OK?
Measure 19.2MHz RF
Clk at testpoint
C510. Is it OK?
Measure PURX and
SleepX at test points
J402 and J403. Are
they high (1.8V)?
Phone is
jammed,
page 2
Check VBATT, VIO,
VCORE, VFlash1,
VANA, VR3 capacitors.
Are they OK?
Measure the 32kHz
Clk crystal. Is it OK?
Measure the
19.2MHz Clk coming
from the VCTCXO at
from the VCTCXO at
C728 and C711. Is it
OK?
Check BSI/BTEMP
lines and VBATT
lines. If OK, reflow or
change UEM
Repair
Change B200
Reflow or change
UEM
Check G500, C522, C521,
R517, R516. If OK, change
G501. Check C728. If OK,
change N700.
Change UPP
Change UEM
NO
YES
NO
YES
NO
NO
YES
YES
NO
NO
YES
YES
NO
YES