Read Sharp UP-5900 (serv.man8) Service Manual online
UP-5900VS
SERVICE PRECAUTION
3 – 1
CHAPTER 3. SERVICE PRECAUTION
1. CONDITIONS FOR SOLDERING CIRCUIT PARTS
To solder the following parts manually, follow the conditions described below.
Thermal fuse installation fig
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
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 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 place
stress to the heat seal section when installing.
• The touch panel is provided with an air groove to make the external
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
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 entrees.
4. NOTE FOR HANDLING OF LCD
• The LCD elements are made of glass. BE careful not to expose them
to strong mechanical shock, or they may be broken. Use extreme
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 surface.
• 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.
color may result.
5. CAUTIONS ON HANDLING FFC
When connecting or disconnecting the ffc, follow the procedures below.
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How to insert FFC
(1) Pull the slider to the unlock position.
(2) Inserting the FFC
Insert the FFC firmly until the FFC hits the bottom of the connector’s
insulator.
(3) Close the slider to the lock position
PARTS NAME
PARTS CODE
LOCATION
CONDITIONS FOR SOLDERING
Ceramic oscillator
RCRMZ7002RCZZ
TOUCH PANEL CONTROL PWB: X1 (8M)
270°C/3sec.
RCRMZ7004RCZZ
MAIN PWB: X4 (8M)
RCRMZ7004RCZZ
MAIN PWB: X3 (7.37M)
Thermal fuse
QFS-T0096FCZZ
MAIN PWB: F1
300°C/3sec (Length of lead: 15mm or more)
F1
SILICON BOND
Q5
Solder
15mm or more
FFC
FFC
FFC
CONNECTOR
CONNECTOR
CONNECTOR
FFC
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