Chapter 7 Trouble Shooting Guide; Identify Reported Failure Symptom Before Repair - HTC SkyWriter Service Manual

Doc. Title

Chapter 7 Trouble Shooting Guide

7.1 Identify reported failure symptom before repair

Before attempt repairing the unit, make sure the type of reported failure could be clearly reproduced;
otherwise, check with the customer or distributor once again to identify the problem correctly. The
following are failure symptoms that are typical by misjudgment.
No. Item
No Power even the power
1
button is pressed
2 Battery discharges quickly
3 Battery cannot be charged
Cannot make
communications via mobile
4
phones through exclusive
cable.
Cannot use Micro SD
5
Memory Card
HTC confidential
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宏達國際電子股份有限公司
HTC Corporation
SkyWriter Service Manual
Possibility
Main Battery low power exhausted.
While Back Light is turned OFF, the surrounding lighting will be reflected on the
panel and in a dim location; it looks like the unit is turned OFF.
According to the Power Management settings, the units will be switched OFF
automatically.
The battery life depends on the devices being used in SD Card Slot, and
frequency of use of the Backlight. These functions consume a lot of energy.
Operating with front light ON, or using high-energy consumption devices such as
SD Memory Card will drain out the battery pack faster.
Using AC adapter that is NOT supplied with the unit.
Charging the battery while operating the unit with heavy loadings could cause the
temperature inside the unit to build up which could cause the unit stop charging.
At this moment, the LED indicator will flash Yellow to notify user that the charging
has been stopped. Or the temperature is extremely low will also stop charging.
Since the extreme high or low temperature will cause the battery to discharge
quickly, it has been designed to cut battery charge below TBD℃ and above
TBD℃ to protect the battery pack.
If the unit could pass the test with Loop back Interface card, the possibility of unit
malfunction becomes low. Then the following items could be the reason of
problem such as location, timing, signal strength, service provider's mixed up, or
problem with the mobile itself. Or could be incompatibility issue.
Card is not being pre-formatted.
Micro SD card has been switched to Write Protect mode.
Card is not inserted completely or bad contact between connector contacts.
PAGE NO. 46
Doc. No. DOC-00045404
Issued Date
2008/08/18
Revised Date 2008/08/15
Page 46 of 83
REV.
A01