Motorola 3G All Service Manual

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Consumer Solutions & Support

US Competency Center
600 North US Highway 45
Libertyville, Illinois 60048

Website: gs.mot.com

FIELD SERVICE BULLETIN

FSB Number: LVCCFSB2004-263
Author: Ross Karlen
Date: Dec 22, 2004
Total No. of Pages: 2
Subject: 3G All – High Rate Charger
Model Affected: 3G All
Level of Repair: N/A

Problem

This is an information Bulletin, highlighted by the field, where the end user complains of
unit powering down during charging. It has been identified in some instances the
customer has used a mid-rate charger causing the unit to exhibit this system. All 3G
units require the use of a High Rate Charger.

In some modes with a midrate, B+ will draw more then the midrate can supply (450mA
max) and the PA is not even on. In this mode, the seamless switching in your hardware
will occur and some current will be sourced from the battery, the voltage will rise on B+
and the switch will open over and over then you have this uncontrolled oscillation.

When in a call, we go to single path and run everything off the 450mA from the midrate,
if the phone draws more then that (PTP call) the phone eventually powers off. With the
fast charger, we run the phone in dual path (B+ runs off external power and the battery
is charged through the charge FET) Fast rate can supply 1.8 Amps so B+ gets all the
supply it needs, and the battery gets what it needs + what the PA is drawing.

Solution

Notify Customer to use High Rate Wall Charger supplied with the phone.

Service Action

Customer Returns:

When servicing all 3G customer returns, with a customer complaint related to of
“Doesn’t charge or Powers down during Charging”, then:

a. Follow normal troubleshooting procedure per the customer complaint.

MOTOROLA INTERNAL USE ONLY Page 1

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Consumer Solutions & Support

US Competency Center
600 North US Highway 45
Libertyville, Illinois 60048

Website: gs.mot.com

Service Inventory:

No Action Required.

Call Center Information

When responding to problem product inquiries where customer complains of unit
powering down during charging or cannot charge, please verify the customer is using
the supplied High Rate Wall Charger at time of purchase.

Service Entry Code

Please ensure that repairs of this type are logged on the Service database as follows:

Global M-Claims Codes:

Customer Complaint Codes: N/A
Problem Found Code: N/A
REF Designator Code: N/A
Repair Code: N/A

Asia Codes:

Fault Code: N/A
Repair Code: N/A

PRC E-Service Codes:

Customer Complaint Codes: N/A
Problem Found Code: N/A
REF Designator Code: N/A
Repair Code: N/A

MOTOROLA INTERNAL USE ONLY Page 2