Sony Ericsson C702, Troubleshooting Manual

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C702
1221-7857 rev. 1
TROUBLESHOOTING System Connector Protection Tes
TROU
B
L
E
S
H
O
OTIN
G
t - Current Consumption Test
System Connector Protection Test
Perform Diode and Ohm measurements with a Multimeter
Connect the black probe to ground (Pin 4 at system connector)
Pin 12 Pin 4 GND Pin 1
Pin at
X2300 Diode Measurements/Volt Ohm Measurements/Ohm SL 4 Action SL 5 Action
1 0L 91K V2421 if lower
V2202 if lower
X2300 if higher
L2411 if higher
N2000 if higher or
lower
2 0.8 – 1.0 150K – 400K V2411 if lower
D2424 if higher or lower
X2300 if higher
Z4203 if higher
3 2.6 150K – 400K V2410 if lower
D2424 if higher or lower
X2300 if higher
Z4203 if higher
4 GND GND X2300 if higher No Action
5 1.5 1.5K X2300 if higher
L2405 if higher
V2420 if lower
R2440 if higher
R2436 if higher
6 0L 0L Not Connected Not Connected
7 1.8 2.2K L2404 if higher
N3101 if higher or lower
X2300 if higher
R2482 if higher
C2425 if lower
8 1.8 2.2K L2403 if higher
N3101 if higher or lower
X2300 if higher
R2481 if higher
C2416 if lower
9 1.0 1K L2402 if higher
N3101 if higher or lower
X2300 if higher
R2488 if higher
C2437 if lower
10 2.1 12K L2401 if higher
N3101 if higher or lower
X2300 if higher
R2487 if higher
C2436 if lower
11 0 1.3 L2408 if higher
X2300 if higher
No Action
12 0L 0L N2402 if higher or
lower
X2300 if higher
L2407 if higher
C2421 if lower
C2422 if lower
Current Consumption Test
Step 1:
Insert Local SIM Card and use the phone with the Normal SW (SSW) and dummy
battery connected to Power Supply Channel 1 VBATT according to Picture 1.
Instrument settings: Voltage: 3.8 Volt, Limiter 3A.
Measure the current when Phone is off. Check the current consumption at Power
Supply Channel 1 VBATT.
Picture 1
Current consumption in off mode should be less than 1mA.
If more than 1mA go to Dead Phone problems part 1 TRS guide.
Step 2:
Start the phone:
Measure the deep sleep current max 6mA typical between 0-3mA.
Make sure that the operator is running with deep sleep. (This operation can be
switched off by operator if the network is busy).
If phone using more than 6mA, then go to EMMA and perform Software Update
Contents Refresh (SUCR).
Step 3 with Mobile Phone Tester Instrument
Insert Test SIM Card and use the phone with the Normal SW (SSW) and dummy
battery connected to Power Supply Channel 1 VBATT according to Picture 1.
Instrument settings: Voltage: 3.8 Volt, Limiter 3A.
Use Mobile Phone Tester Instrument in signalling mode directly connected to the
phone with RF Connector or use Shield Box if not possible. Phone Display must be
on during these tests to get correct current measurements.
Perform Radio TX measurements at GSM and WCDMA Band and compare with limits
according to text below.
- Transmitter current 850 MHz at Ch: 128 power level 5. Typical 375mA
- Transmitter current 900 MHz at Ch: 1 power level 5. Typical 450mA
- Transmitter current 1800 MHz at Ch: 512 power level 0. Typical 365mA
SEMC Troubleshooting Manual
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