User Guide

CCS Technical Documentation Troubleshooting — RF
RH-17
Issue 1 04/2003 Nokia Corporation Confidential Page 13
Tuning Description
Test 1 TS Initial Current
Description
Check initial current consumption at start-up to make sure phone is consuming correct
amount of current.
Explanation of Result
Phones current consumption is measured and should be between 5mA and 100 mA.
Manual Verification
Check using Power Supply and Multimeter, example follows. Power Off phone and follow
setup below to verify if phone’s current consumption is correct.
1 Positive Banana connector on Test Fixture to Power Supply +
2 Ground Banana connector on Test Fixture to | on Multimeter
3 Jumper cable between Power Supply (-) and Multimeter (input low)
4 Set Multimeter to measure current (DC|)
5 Multimeter should have an initial reading, this is the current being drawn by the
Text Fixture. Null out the Multimeter to Zero the reading.
6 Place phone in Test Fixture
7 Press Power key to turn phone on
8 Observe current draw at Multimeter. It should be between 5.0mA and 100.0mA.
Troubleshooting
If phone drains all available current:
Check VBAT and do a visual inspection of all baseband ICs including orientation. VBAT
supplies the D200 (UEM), N603 (Tomcat), N801 (PA), X101, N100, B302, M300, N300,
and X470.
If the phone has initial current consumption at start-up then powers down:
If, after a few seconds, all circuits power down, it is normally caused because the watch-
dog signal between UEM (200) and UPP (D400) has expired. Watchdog is used by the
phone for fault detection.
• Check voltage regulators for correct voltage. If voltage is low or not
present, check for shorts.