Chapter 3. Service Precaution - Sharp UP-5300 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 maintenance activities on the CPU and
POWER FAN, be sure to handle them with care, because it may
cause abnormal sounds or deteriorate their performance if they are
dropped or exposed to a heavy impact.
3. Note for handling of Touch panel
•
The transparency of the touch panel should be vitally important.
Use clean gloves and masks.
•
For handling, do not hold the transparent area, 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 place heavy things on the touch panel.
•
Do not apply a strong shock, and do not drop it.
•
When attaching the protection film again, carefully check for dirt. If
there is any dirt, it is transferred.
•
To clean dirt on the surface, use a dry, soft cloth or a cloth im-
mersed 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
place 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.
•
Do not use SHARP objects when making input entrres.
PARTS CODE
RCRMZ7002RCZZ
TOCH PANEL CONTROL
PWB: X1 (8M)
RCRMZ7003RCZZ
MAIN PWB: X2 (24M)
RCRMZ7004RCZZ
MAIN PWB: X2 (7.37M)
QSW-Z7011XCZZ
SWITCH PWB: S2
LOCATION
270°C/3sec.
300°C/3sec.
4. Note for handling of LCD
•
The LCD elements are made of glass. BE careful not to expose
them strong mechanical shock, or they may be broken. Use ex-
treme care not to break them.
•
If the LCD element is broken and the liquid leaks, avoid contact
with your mouth or eyes. If the liquid comes in contact with your
skin or clothes, immediately clean with soap.
•
Use the unit under the rated conditions to prevent against damage.
•
Be careful not to place water or other liquids on the display sur-
face.
•
The reflection plate and the polarizing plate are easily scratched.
BE careful not to touch them with a hard object such as glass,
tweezers etc. Never hit, push, or rub the surface with hard objects.
•
When installing the unit, be careful not to apply stress to the LCD
module. If 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
QCNCW2812BH3J
FFC
CONNECTOR
•
How to insert FFC
(1) Pull the slider to the unlock position.
3 – 1
CONDITIONS FOR SOLDERING
PARTS CODE LOCATION
LCD RELAY
PWB: CN8