Introduction To Rh-47 Baseband Troubleshooting; General Guidelines For Rh-47 Troubleshooting; Tools Needed For Troubleshooting; General Guidelines - Nokia RH-47 Series Description

RH-47
7 - Baseband Description & Troubleshooting

Introduction to RH-47 Baseband Troubleshooting

This document is a guide for localizing and repairing electrical faults in the RH-47
device. First there is a brief guide for fault localizing. Then fault repairing is divided into
troubleshooting paths.
Before any service operation, you must be familiar with the RH-47 product and module
level architecture. You have to be also familiar with the RH-47 specific service tools such
as the Phoenix service software, flashing tools and software.

General guidelines for RH-47 troubleshooting

Tools needed for troubleshooting

• Service tools (as listed at service tools chapter in this service manual)
• Laboratory power supply with current indicator
• Oscilloscope
• Digital multimeter

General guidelines

If the device cannot be turned on by any means, see "dead device" troubleshooting.
Current consumption (missing consumption) gives an idea whether the device is able to
start up.
Dropping supply voltage or very large current consumption indicates a short circuit.
Check whether the connection with Phoenix works and what can be discovered with
Phoenix (ADC-readings, baseband self-test, BB-calibrations etc.).
If "CONTACT SERVICE" is shown on the display, check baseband self-tests with Phoenix.
Check visually display and rocker faults.
Force phone to LOCAL mode and make keyboard test with phoenix.
Check that the board-to-board connector is OK, and connectors make good contacts.
If there is a liquid damage, stop repairing!
If the fault is not obvious and Phoenix connection is OK, flash the phone before disas-
sembling.
Disassemble phone: try to locate failed module.
When located, check the failed module visually:
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