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EIF4292
GLOBAL GSM SERVICE SUPPORT
FIELD SERVICE BULLETIN
Title: P2K Mid-Rate Charger Incompatibility
Author: Anne McCluskey/ Alan Abraham
Date: 23
Number of Pages: 2
Bulletin Ref. No: EI0403(Rev. B)
Product: V70 and T720
System: GSM
Problem:
A problem has been identified in charger SPN4940C from vendor PhiHong, when used with T720 and V70
products. The issue is exhibited by the unit powering down when a call is made or received, while in low
battery condition and during charging.
The combination of a new electrical design and the exclusion of a capacitor on ExtB+ line on the radio has
resulted in this issue. When the power supply experiences a sudden change in current demand from the
phone, the inductance of the power supply cable and the capacitance on the output of the power supply,
create a voltage ringing on the ExtB+ line and thus results in a power re-set. When this happens, the phone
will default to charge only mode, the phone is not damaged.
Solution:
PHIHONG
suffixed from suffix C to D for ALL
rd
January 2003
have implemented a design change to the charger; the charger part number has been up
new chargers with the capacitor fitted.
Part Number – SPN4940D (see fig. 1)
Please note that chargers do not exhibit this issue with GSM products other than V70 and T720.
Fig. 1
MOTOROLA CONFIDENTIAL & PROPRIETARY
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EIF4292
T720 & T720i units should also be modified as follows:
The resistor at Ref. Des. R7001, should be replaced with a capacitor: part number 2113928R03. (See Fig.
2).
Old : Resistor
Service Action:
All repairs should be logged into EPPRS system as follows:
Customer Complaint: 15 - Phone switched itself off when making or answering a call
Root Cause: 54 - Charger Faulty
ew : Capacitor, the body is in Grey
the body is in Black
Fig. 2
MOTOROLA CONFIDENTIAL & PROPRIETARY