K850
1203-2528 rev. 1
TROUBLESHOOTING
Current Comsumption Test
TROU
B
L
E
S
H
O
OTIN
G
-
Transmitter current
850 MHz
at Ch: 128 power level 5. Typical
400mA
-
Transmitter current
900 MHz
at Ch: 1 power level 5. Typical
400mA
-
Transmitter current
1800 MHz
at Ch: 512 power level 0. Typical
400mA
- Transmitter current
1900 MHz
at Ch: 512 power level 0. Typical
400mA
- Transmitter current
WCDMA BAND I
Low RX Ch: 10562 at 23dBm output
power. Max
750mA
If current consumption is not correct, the fault could be fixed by running SERP
calibration if not then go to
GSM and WCDMA Network problems TRS guides.
If the current consumptions are equal to test limits then go to
Charging Test
.
Step 4 with Fault Trace SW application:
-
Flash the phone with ITP SW
-
Use TRS Fixture
-
Connect the:
Power Supply Channel 1 VBATT:
Instrument settings: Voltage: 3.8 Volt, Limiter 3A
Power Supply Channel 2 DCIO/SEPI
Instrument settings: Voltage: 5 Volt, Limiter 2A
-
Connect DCIO/SEPI Cable to the phone
Perform the following tests:
-
Max TX Power GSM 850 MHz
Fault Trace SW settings:
TX and RX GSM
GSM Mode Settings:
TX Switched
GSM Radio Settings:
Select Band: GSM 850
Channel: 128
Power Level: 5
-
Max TX Power GSM 900 MHz
Fault Trace SW settings:
TX and RX GSM
GSM Mode Settings:
TX Switched
GSM Radio Settings:
Select Band: GSM 900
Channel: 1
Power Level: 5
-
Max TX Power GSM 1800 MHz
Fault Trace SW settings:
TX and RX GSM
GSM Mode Settings:
TX Switched
GSM Radio Settings:
Select Band: GSM 900
Channel: 512
Power Level: 0
-
Max TX Power GSM 1900 MHz
Fault Trace SW settings:
TX and RX GSM
GSM Mode Settings:
TX Switched
GSM Radio Settings:
Select Band: GSM 900
Channel: 512
Power Level: 0
-
Max TX Power WCDMA BAND I
Fault Trace SW settings:
TX and RX WCDMA
Radio Settings:
Select Band: BAND I
Fast Select Channels: Ch LOW
Modes: Max Pwr 23dBm
Compare current consumption during Max TX Power Tests with the current
consumption limits below.
-
Transmitter current
850 MHz
at Ch: 128 power level 5. Typical
255mA
-
Transmitter current
900 MHz
at Ch: 1 power level 5. Typical
240mA
- Transmitter current
1800 MHz
at Ch: 512 power level 0. Typical
200mA
- Transmitter current
1900 MHz
at Ch: 512 power level 0. Typical
220mA
- Transmitter current in
WCDMA BAND I
Low RX Ch: 10562 mode at max
power level 23 dBm and Rx on.Typical
600mA
Tolerance: ±10%
If current consumption is not correct, the fault could be fixed by running SERP
calibration if not then go to
GSM and WCDMA Network problems TRS guides.
If the current consumptions are equal to the sheet then go to
Charging Test
.
SEMC Troubleshooting Manual
21
(101)