K850
1203-2528 rev. 1
TROUBLESHOOTING System Connector Protection Test
TROUBLESHOOTING
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 III 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 direct 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.
System Connector Protection Test
Perform Diode and Ohm measurements with DMM
Connect the black probe at ground (Pin 9 system connector)
Pin at
X2400
Diode
Measurement
/ Volt
Ohm
Measurement
/ Ohm
SL 4 Action SL 5 Action
1 0L 0L N2402 if Not 0L C2422 if Not 0L
2 0.0 1.4 No Action L2405 If higher than 1.4Ω
3 2.0 12K
N3101 if lower than 12KΩ
L2401 if higher than 12KΩ C2421 If lower than 12KΩ
4 1.0 1K
N3101 if lower than 1KΩ
L2402 if higher than 1KΩ C2420 if lower than 1KΩ
5 2.0 9K
N3101 if lower than 9KΩ
L2403 if higher than 9KΩ C2416 if lower than 9KΩ
6 2.0 9K
N3101 if lower than 9KΩ
L2404 if higher than 9KΩ C2415 if lower than 9KΩ
7 0L 0L Not connected Not connected
8 1.4 1.5K V2420 if lower than 1.5KΩ
R2451, R2440, R2436
if higher than 1.5KΩ
9 0 0 No Action
R2455 if Not 0Ω between
X2400_Pin9 and PBA GND
10 0.7 200K-470K N2401if lower than 200KΩ
D2450 if lower than
200KΩ R2465 if higher
than 470KΩ
11 1.0 200K-470K N2401if lower than 200KΩ
D2450 if lower than
200KΩ R2466 if higher
than 470KΩ
12 0L 80K V2421 if lower than 80KΩ
C2423, C2424
if lower than 80KΩ
/ Current Comsumption Test
SEMC Troubleshooting Manual
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