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CONFIDENTIAL
Service & Analysis Center Europe
Training Team
Doesn't Switch on
Phone doesn't switch on, section: DC / DC converter
Check VB (Battery 2,4V-3V)
check connector X101/ X102
No
on L102
change if bend or soiled
Yes
check the solderings and
No
resolder or change L102
resistance of L102 "0Ohm"
Yes
check the connection between
Swap the phone if the
No
L102 and R132 (0 Ohm)
connection is open
Yes
check V109 and the
check pin 3 from V105
No
respective voltage deviders
on="low"status 0Ohm
R131,132,134,143,144
Yes
Check 600KHz switching
check the voltage on V101
check solder of V105 or
No
frequency on Pin 4,5,12,13 of
No
anode 2,6V; cathode 3,2V
change if necessary
V105
Yes
Yes
check solder of V105 or
DC/ DCconverter is oK!
Check 1,2V operation voltage
change if necessary
No
continue with CCONT
on Pin 15 of V105
check also R102, R105, R112
version 1.0 / 05.11.1999
Page 4 of 37
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