Nokia 3210 Repair Manual page 27

Customer Care Europe & Africa
Technical Services Training Group
PHONE SWITCHES OFF
Phone switches off
intermittently
Check if this happens
only with 5V SIM-cards
and if the phone works properly
with 3V SIMcards
nOK
Check 5V
supply voltage at C136
with oscilloscope
nOK
Change C131 if the noise is
higher than 350mVpp
C136 10µF/10V
Check if the phone does not switch off with 3V SIM Cards.
Check if VSIM at C136 is approximately 4.8V-5.2V, with maximal 350mVpp noise overlap - see diagram below.
Diagram of normal noise at C136.
© 2001 Nokia Mobile Phones
CONFIDENTIAL
NSE-8/9
Date: 05.09.2001
Check X101
and X102,
OK
if poor soldered,
bent or soiled
OK
Check amplitude
of 32.768kHz square
wave at C145, 3Vpp
OK
Check amplitude
of 13MHz RF Clk at
C301 (900mVpp)
OK
Check VBB 2.8V DC
at C117
Checked by:
CC Training Group
Repairhints
Version 5.0 Approved
Resolder, change or clean
nOK
the connectors
Change or check
nOK soldering of B100, C147,
C148, C153, N100
Change or check
soldering
nOK
of G701, V702
Change or check
not OK soldering
of N100, C117
Approved by:
Technical Services
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