DBTEL Incorporated
DB-6568 Service Manual Level 1 ~ 3
2003.11.13
DBTEL Copyright Reserved
Page 33 of 66
5.2 DB6568 Introduction to troubleshooting
DB-6568 troubleshooting is divided into 3 levels
，
contents are as follows
：
一、
1st level
：
Cannot disassemble screw nuts of mobile.
a. To change battery
Check Battery voltage is lower than 3.0 V
，
and it results in that mobile not power on.
b. SW upgrade
二、
2nd level
：
Disassemble screw nuts but not PCBA.
a. Replace housings and parts of housing
：
It includes Keypad(Mylar Done)
、
LCD Sponge
、
Front Panel of LCD Module
、
Speaker
、
Rubber Keypad
、
Antenna etc
。
b. Simple menu test commands
：
Use manual test command to check SW version
、
function of Vibrator
、
LCD module
、
Buzzer
、
Microphone and speaker
。
三、
3rd level
：
Repair including components, PCBA
、
modules Circuit and parameters of SW
a. Disassembling handset components or parts, including SMD components, shielding
case, BGA IC , SIM card holder, RTC battery and holder, vibrator connector, battery
connector, external connector, headset jack, Vibrator and holder, buzzer, Charger
connector, antenna holder ,microphone jack ...etc.
b. Modifying EEPROM related parameter via software, including IMEI code modification.
c. Performing the RF circuit and module test and analysis, parameter adjustment via
testing equipment and manual test command (Manual Test Mode1 & 2).
