Chapter 3. Service Precaution - Sharp UP-5700 Service Manual

CHAPTER 3. SERVICE PRECAUTION

1. Conditions for soldering circuit parts
To solder the following parts manually, follow the conditions described below.
PARTS NAME
Ceramic oscillator
DIP SWITCH
2. Cautions on handling CPU and POWER
FAN
When removing or performing any other operation on the CPU and
POWER FAN, be sure to handle them with care, because it may
cause abnormal sound or deteriorate the performance while the CPU
FAN is rotating if they are dropped or given heavy impact.
3. Note for handling of Touch panel
The transparency of the touch panel should be vitally important.
Do not put finger prints or water print on the surface. Use clean
finger such or gloves and masks.
For handling, do not hold the transparent are, and do not hold the
heat seal connector section to assure reliability.
Do not overlay touch panels. The edge may damage the surface.
Do not put a heavy thing on the touch panel.
Do not apply a strong shock, and do not drop it.
When attaching the protection film again, carefully check for no
dirt. If there is any dirt, it is transferred.
To clean dirt on the surface, use dry, soft cloth or a cloth immersed
in ethyl alcohol.
Check that the housing does not give stress to the touch panel.
Be careful not to touch the touch panel with tools.
The heat seal section is easily disconnected. Be careful not to give
a stress to the heat seal section when installing.
The touch panel is provided with an air groove to make the exter-
nal and the internal air pressure equal to each other. If water or oil
is put around the air groove, it may penetrate inside. Be careful to
keep the air groove away from water and oil.
Input is performed with fingers. Do not use a hard thing for input-
ting.
PARTS CODE
MAIN PWB: X1 (8M)
MAIN PWB: X2 (24M)
MAIN PWB: X2 (7.37M)
MAIN PWB: S3
3 – 1
LOCATION CONDITIONS FOR SOLDERING
270°/3sec.
3000°/3sec.
4. Note for handling of LCD
The LCD elements are made of glass. BE careful not to give them
strong mechanical shock, or they may be broken. Use extreme
care not to break them.
If the LCD element is broken and the liquid is leaked, do not lick it.
If the liquid is attached to your skin or cloth, immediately clean with
soap.
Use the unit under the rated conditions to prevent against damage.
Be careful not to drop water or other liquid on the display surface.
The reflection plate and the polarizing plate are easily scratched.
BE careful not to touch them with a hard thing such as glass,
tweezers. Never hit, push, or rub the surface with hard things.
When installing the unit, be careful not to apply stress to the LCD
module. If an excessive stress is applied, abnormal display or
uneven color may result.
5. Cautions on handling connectors
When connecting or disconnecting the following connectors, follow
the procedures below.
1)
PARTS NAME PARTS CODE
FFC
CONNECTOR
How to Connect or Disconnect FFC
(1) Open the slider to unlock position
The slider will open only up to a fixed height (about 1.2mm). If
you forcibly pull up the slider further, it may be dropped.
Slider
LOCATION
MAIN PWB: CN12
KEY I/F PWB: CN8/CN10
UNLOCK
1.2mm