GX20
3 – 1
CONFIDENTIAL
OZ/IQ/YO/Calc
GX20
Service Manual
TQGX20
Market
E
CHAPTER 3.
DISASSEMBLY AND REASSEMBLY
[1] Servicing Concerns
1. General
1. Before servicing, you must warn the user that the repair may clear
the information stored in the memory.
2. Before storing or transporting the circuit board, put it into the con-
ductive bag or wrap it in aluminium foil.
(C-MOS IC may be damaged by electrostatic charges.)
3. In order not to stain cosmetic parts such as a cabinet, especially
clear window parts for main and external display panels by finger
print or whatever, please cover your finger by finger sack.
Also, please take care about surface of main and external display
panels not to stamp finger print.
4. To prevent oxidation which cause connection problem, please do
not touch any terminal on electric board, microphone, vibrator, ear-
piece and speaker.
If you have to touch there, please cover your finger by finger sack.
If you touch those parts, please clean by soft dry cloth.
Also, please do not touch shield case on electric board directly with-
out finger sack, otherwise performance of the phone may decline
because of oxidation.
5. Since FPC is sensitive, please handle FPC careful so that you will
not make any damage.
6. Please do not wet the moisture sensor.
Once the sheet is wet, red ink is supposed to run. In this case,
please replace the sheet with new one.
Please take care about your sweat.
7. Be sure to remove the Li-Ion battery from mobilephone.
8. Take sufficient care on static electricity of integrated circuits and
other circuits by using static electricity prevention bands when ser-
vicing.
2. For disassembling
1. Please do not remove the board of base band section by pulling
external interface connector, otherwise you will make damage to
the board.
2. Shield case is attached on shield case holder without clearance.
When you remove it, please take care not to remove together with
shield case holder. If you remove shield case holder together, you
can not attach it again because it is attached by solder and in such
a case, you should have taken electric pattern on the board as well.
3. For reassembling
1. Please make sure that all cosmetic parts have no scratch and
clean.
2. Please make sure that you can open and close handset smoothly
and hear tick sound of hinges.
3. Please make sure that external display cushion can not be seen
from the window.
4. Please make sure that main screen display panel is placed in
proper position without inclination.
5. Please make sure that all three battery terminals protrude evenly.
6. Please make sure that the pawl of aerial is upside.
•
FASTENING TORQUE (Referential Value)
The value is for reference when an electric screwdriver (HIOS
CL4000) is used.
•
SOLDERING SPECIFICATION
Soldering iron must be set to 350° C for 5 seconds.
•
Diagram for Service Label Position
Before attaching the cabinet, remove and throw out the service
label with IMEI Number written on it as shown in the illustration. If it
is not removed or it is put on the other position, the handset may be
damaged.
•
STANDARD POSITION OF ATTACHMENT
When replacing the following labels (marked with
), be sure to
put new ones on the specified positions.
[Sensor, Moisture]
• Back Cabinet (Key)/
Front Cabinet (Key)
• Back Cabinet (Display)/
Front Cabinet (Display)
14.7
±
2.0 N • cm
(1.5
±
0.2 Kgf • cm)
Standard
position
Standard
position
Case
RF
,
shield
(co
v
er)
Fixing tape
Separator
Service label
SIM card connector
(SIM card connector end face)
(Exter
nal
connector
end
face)
Note:
Do not put the fixing
tape on the service
label.
Standard
position
(Corner)
Standard
position
(Corner)
Sensor, Moisture
Back Cabinet (Key)
