Sony Ericsson K850 - Battery & Current Calibration Test; Backup Capacitor Test

K850
1203-2528 rev. 1
TROUBLESHOOTING Battery & Current Calibration Test
TROUBLESHOOTING
Backup Capacitor Test
To perform this test use:
- Phone with the ITP SW
- Power Supply Channel 1 VBATT: Instrument settings: Voltage: 3.8V, Limiter: 2A
- Power Supply Channel 2 DCIO/SEPI: Instrument settings Voltage: 5V, Limiter: 2A
This test should be preformed in 3 steps:
Step1:
Measure the voltage at the Back up capacitor by using Fault Trace SW- Logic -
ADC Values – Read ADC Value (Reading 1).
Step2:
This step should be done 30 seconds after Step 1. Measure the voltage at the
Backup capacitor by using Fault Trace SW - Logic – ADC Values - ADC Channels
– Read ADC Value (Reading 2).
Step3:
Compare the difference between Reading 1 and Reading 2 with the reference table
below. If the Reading 1 value is between 50 and 680 go to Interval 1, if between 681
and 800 go to Interval 2, if between 801 and 880 go to Interval 3 and compare with
the Reading 2 – Reading 1 Min and Max Limits.
Reference Table:
Min Max Unit
Absolute readout
Reading 1
50 880 Dec
Reading 1 (Dec) Reading 2–Reading 1 (Dec)
Min Max
Interval 1 (50 – 680)
20 210
Interval 2 (681 – 800)
530
Interval 3 (801 – 880)
010
Note: The upper table contains the absolute limits for the readouts. The lower table
contains the allowed delta between the first and the second readout, separated in
time with 30 seconds.
If the readings is out of limits replace C2217 Backup capacitor.
If problem is not solved then SL 5 Replace N2000 SL 4 Scrap.
Battery and Current Calibration Test
Instrument settings for the Battery Calibration Test
Power Supply Channel 1 VBATT:
X Volt according to the Fault Trace SW Test Instructions:
Fault Trace SW-Logic-Phone Power-Battery Calibration and follow test instructions.
Limiter: 2A.
If test is performed at the Core Level then use dummy battery according to the K850
Equipment List for this test. If using TRS Fixture no dummy battery is needed.
Note: Maximal cable length between Power Supply Channel 1 VBATT and the dummy
battery or TRS Fixture must be 1m. The cable must have a capacity for at least 16A.
Limits Table for the Battery Calibration Test
Voltage Level on VBATT Min Max UNIT
3.2 Volt
202 338 mV
3.2 Volt
CA 152 HEX
4.1 Volt
743 886 mV
4.1 Volt
2E7 376 HEX
Instrument settings for the Current Calibration Test
If test is performed at the Core Level then use dummy battery according to the K850
Equipment List for this test. If using TRS Fixture no dummy battery is needed.
Note: The Power Supply Channel 1 VBATT must allow reverse current.
Note: Maximal cable length between Power Supply Channel 1 VBATT and the dummy
battery or TRS Fixture must be 1m. The cable must have a capacity for at least 16A.
Note: Length of the Power Supply Channel 2 DCIO/SEPI customized cable must be
exact 1,3m.
Power Supply Channel 1 VBATT:
3.8 Volt
Limiter 2A
Power Supply Channel 2 DCIO/SEPI:
5.0 Volt
Limiter: 2A
Limits Table for the Current Calibration Test
Measured Current Name Min Max Unit
100mA
DCIO Current 50 150 mA
800mA
DCIO Current 725 875 mA
/ Backup Capacitor Test
SEMC Troubleshooting Manual
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