Table of Contents
Advertisement
Battery connectors X101/ X102 / bend out dirty
Check if VBATT and Gnd are connected
Power on/off switch S416 faulty/ mechanical broken
Check if 3,2V on R413 drops of 0V during pressing the Power on button
L102 poor soldering
Check the soldering of L102
Check the resistance in "off mode=0 "
Resolder L102 or change it
N100 CCONT faulty
Check if 3,2V on R413 drops of 0V during pressing the Power on button
Check if there is a 32.768 kHz square wave on C149
Check if PURX on R303 goes up to 2.8 V DC
Check if VXO on C102 goes up to 2.8 V DC
Check if VBB on C117 goes to 2,8V DC
Check if Vref on C123 goes to 1,5V DC
B100 faulty 32,768KHz
Check 32.768 KHz ; 700mVpp clock signal on B100
Check also C147, C148, C153
G701 faulty 13 MHz
Check VCC 2,8V DC on G701
Check 13 MHz output frequency; 1,2 Vpp on the output pin
VB to R132 board faulty
Check the battery voltage 2,6V on L102
Check the same voltage on R132
Check if the connection from R132 to L102 are 0
Don't forget to put the additional label on the PCB, it save the layer (see Service Bulletin 11)
D200 MAD faulty
Check if there is a 32,768 KHz square wave on C149
Check the 13MHz main clock oscillator on C301 800mVpp
Check VBB 2,8 V DC on C117
Check PURX 2,8 V DC on R303 (comes from CCONT)
Check SLEEPX 2,8 V DC 0n measurement point J 340
MAD are probable faulty
MAD are not interchangeable swap the handset
V105 DC/DC converter faulty
Check the voltage difference on the diode V101 Anode: 2,6V DC, cathode: 3,2V DC
Check the 600KHz switching frequency on pin 4, 5, 12, 13 from V105
Check the 1,2V operation voltage on pin 15 from V105
Check if pin 3 from V105 have low status 0V, if not check V109 and the respective voltage dividers R131, R132,
R134, R143, R144
Change the V105
version 1.0 / 05.11.1999
CONFIDENTIAL
Service & Analysis Center Europe
Training Team
Page 6 of 37
Hide quick links:
Advertisement
Table of Contents
