Chapter 1. Overview - Sharp PC-4741 Service Manual

CHAPTER 1. OVERVIEW
1. Scope
This manual is covered for PC4702, PC4721, PC4741 CPU and hard
diskdriv9.
For detailed information on other auxiliary equipment and options (list
following), please refer to the separate service manuals provided for
each devices.
CRT adaptor (CE-471A)
MFD unit (CE-452F)
EMS card (CE-471 B)
SID card (CE-451 B)
2.
Service method
1) Cabinet Top Removal
1. Before disassembly, remove the AC adaptor and the
built~in
lead battery.
If the CRT board, the modem board, or the SIO board is
installed, locate the face plate screw fastened to the computer
and remove.
2. Remove the eight screws on the computer's bottom panel.
'f
'"
3.
Lift up
the cabinet top. This reveals the system board of the
computer.
_1-
-
P C-4741
4. Lift up the keyboard and unfasten the connector as illustration
shows. The disconnect the cable.
Key Board Cable
Key
5. First incline the cabinet top backward slowly about 30 degrees.
Then disconnect three cables. (the LCD signal cable, the LCD
backlight cable, and the LED cable.)
2) LCD unit removal
LCD Signal Cable
LED Cable
LCD Backlight
Cable
1. Remove the four screws which are fixing the tilt mechanism.
2. Move a tilt mechanism to the center with a screwdriver, and
remove it upwards.
Then remove the other tilt mechanism in the same manner.