Motorola T720i Service Manual

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FIELD SERVICE BULLETIN

Consumer Solutions & Support
EMEA Competency Centre
Pyramid Business Park
Motorola Bathgate
Bathgate EH48 2EH
West Lothian
Scotland
Website: gs.mot.com/cc

FSB Number: EI0451
Author: Alan Abraham
Date: 12
Total No. Of Pages: 1
Subject: T720/T720i Power Up Delay
Model Affected: T720/T720i Refresh
Level of Repair:

th

March 2003

Problem

The display circuitry for the T720/T720 product requires the internal battery to have a minimum voltage of 3V
before the display will operate.

Should the battery become discharged to a voltage less than 3V the display will not operate. When external power
is applied via the CE connector the display will power up only
least 3V. This power up sequence can take approximately 45 seconds, during this time the CSTN display will be

in colour and no wake up graphics will be visible (See Figure 1) after this delay period the radio should begin

BLUE

to show the charging either icon (See Figure 2) or the wake up graphics. (See Figure 3)

when the battery has been charged to a voltage of at

Figure 1 Figure 2 Figure 3

Call Centre Action:

1) When the battery charger is applied, does the CSTN (Main Display) turn BLUE

2) If YES then ask the customer to wait approx 45 seconds- 60seconds

3) Does the radio power up as indicated above (See Figures 2 &3)

4) YES – Then inform the customer that if the battery capacity is low then the radio may not illuminate the
display during this period

5) NO – Then inform the customer to return the radio to an approved Motorola service centre for further
analysis.

in colour

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