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