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DS160 Mobile Phone Maintenance Manual V 0.1
DS160 Mobile Phone
Maintenance Manual
All information contained in this document, including texts, diagrams,
data, graphics, images, methodologies and ideas, is property of Shanghai
Huaqin Telecom Technology Co.,Ltd. No individual or organization has
any right to disclose, copy, replicate, photocopy or transfer any
information in this document without written authorization by Shanghai
Huaqin Telecom Technology Co.,Ltd.
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DS160 Mobile Phone Maintenance Manual V 0.1
Revision record
Date
Revision
Version
Revision
Reason Revision
Chapter
Revision Description
Author
2009-11-13 V 1.0
First draft complete Yali Liu
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DS160 Mobile Phone Maintenance Manual V 0.1
Table of Contents
1. Technical Specifications.............................................................................................................................5
2. Disassemble Procedures.............................................................................................................................7
3 Functional Module....................................................................................................................................13
4. Troubleshooting .......................................................................................................................................15
4.1 Unable to power on the phone ...........................................................................................................15
4.2 Ringtone Fault....................................................................................................................................16
4.3 LCD display fault...............................................................................................................................17
4.4 Failure to Charge................................................................................................................................18
4.5 Camera fault....................................................................................................................................19
4.6 Failure to identify SIM card...............................................................................................................20
4.7 Main Microphone fault ...................................................................................................................21
4.8 Receiver fault...............................................................................................................................22
4.9 Keypad fault....................................................................................................................................23
4.10 FM fault ........................................................................................................................................24
4.11 Bluetooth fault...............................................................................................................................25
4.12 No RF Signal.................................................................................................................................26
4.13 Failure to read T-flash card ..............................................................................................................27
4.14 Earphone Fault.................................................................................................................................28
4.15 Electric torch Fault...........................................................................................................................29
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DS160 Mobile Phone Maintenance Manual V 0.1
ZL99A is a GSM (GPRS) phone independently developed by
Shanghai Huaqin Telecom Technology Co., Ltd. The Maintenance
arrangement in this article includes three levels:
1. The first level is able to locate the trouble at local by
empirical without any special tools. Hot air gun is usually
not used, and mobile phones with IC fault are generally
not repaired unless approved by the company when
necessary.
2. The second level can make use of some special tools to
solve the trouble. And it’s difficult to think out problems
only by empirical as the first level. Special tools such as
hot air gun, electric iron, oscilloscope and test set need to
be used when necessary. Any component can be used so
as to help to solve the problem.
3. The third level maintenance mainly solves problems that
can not be solved at the second level, and is handled by
the Sevice and Repair center.
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DS160 Mobile Phone Maintenance Manual V 0.1
1. Technical Specifications
Table 1: Conductive Radio Frequency
Radio Frequency (900MHz)
Frequency range Transmission: 880-915MHz; Receiving:
925-960MHz
Bandwidth per channel 200 kHz
Total number of channels 174 channels x 8 (TDMA)
Carrier modulation GMSK (Guassian Minimum Shift Keying)
Duplex bandwidth 45 MHz
Frequency stability ±0.1 ppm
Output power 33±2dBm - 5±5dBm
Receiving sensitivity -106 dBm
Radio Frequency (1800MHz)
Frequency range Transmission: 1710-1785 MHz;
Receiving: 1805-1880 MHz
Bandwidth per channel 200 kHz
Total number of channels 374 channelsx 8 (TDMA)
Carrier modulation GMSK (Guassian Minimum Shift
Keying5)
Duplex bandwidth 95 MHz
Frequency stability ± 0.1 ppm
Output power 30±2 dBm– 0±5 dBm
Receiving sensitivity -105 dBm
Operating temperature range -10 to +55℃
GPRS functionality
GPRS CLASS 10
Table 2: Working Voltage
Working Voltage
Li-ion battery DC 3.5-4.2 V
Table 3: Power Consumption
Power Consumption
Average working current < 250 mA
standby current < 4 mA
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DS160 Mobile Phone Maintenance Manual V 0.1
Talk time* Around 90~160min (1200 mAh lithium
battery)
Standby time* 300~400h (1200 mAh lithium battery)
* Depend on network conditions.
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DS160 Mobile Phone Maintenance Manual V 0.1
2. Disassemble and assemble Procedures
2.1 Disassemble procedure
(1) Remove the screw-hole-plugs of the screw, battery cover
You can pull out the screw with pins or other forceps .Be careful of the shell please. Push the back cover
according to the direction by the arrowhead. Pull the touch pen, please do it along the parallel .
(2) Remove the screws
Remove another 2 screws with the screwdriver
(3) Remove theAcover
Recur to the hard plastic card , tear open theA cover, such as below
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DS160 Mobile Phone Maintenance Manual V 0.1
(4) Remove the main board and the B cover
a. Be careful of the side key
b.Please take out the SIM card before you want to remove the main board
(5) Remove the receiver and the main keys
a. Prize the receiver with the forceps softly
b. Push the face of the main key . Please keep our eyes open the six red points ,keep there right
position
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DS160 Mobile Phone Maintenance Manual V 0.1
(6) Remove the LCD
Turn on the LCD as the arrowhead showed and remove it with the iron .
LCD PAD
(7) Remove MIC
After LCD removed, please dismantle the MIC with the iron.
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DS160 Mobile Phone Maintenance Manual V 0.1
(8) Remove the RF bracket
Remove the screw firstly .Then take down the bracket
RF screw
(9) Remove the FM bracket, SPK and DC Jack
First remove the FM FPC PAD and the SPK pad with the iron. Then loose the Camera and take
down the FM bracket. Last take out the DC Jack and the SPK.
SPK
DC Jack
SPK PAD
FM FPC PAD
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