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3.3 How to Replace the MPU Board in Model M770EL
Do the steps below while referring to Fig 3a CONSOLE & POST, Fig 3b CONSOLE and Section
4 ELECTRONIC PCB, CONNECTOR AND CABLE OVERVIEW.
1) Turn off the unit power at the switch and then unplug the line cord at wall outlet.
2) Remove the DISPLAY REAR COVER (74) from the DISPLAY PANEL BOTTM (72) by
unscrewing four screws (75).
3) Remove four screws (73) securing the DISPLAY PANEL TOP (63) to the DISPLAY PANEL
BOTTOM (72).
4) Lift off the DISPLAY PANEL TOP (63) while disconnecting all the cables from the DISPLAY
PANEL TOP (63) and then place the DISPLAY PANEL TOP (631) on the flat and clean surface
so that the LCD screen faces downward.
5) Disconnect all the cables from the MPU BOARD_FRONT (13).
6) Remove three screws (7) securing the MPU BOARD_BACK (15) to the MPU
BOARD_FRONT (13).
7) Carefully lift the MPU BOARD_BACK (15) off the MPU BOARD_FRONT (13) so that the pins
on the both edges of the MPU BOARD_FRONT are not damaged or bended.
8) Remove four screws (12) and three HEXGON SPACER (14) securing the MPU
BOARD_FRONT (13) to the DISPLAY PANEL_TOP (11).
9) Lift off the MPU BOARD_FRONT (13)
10) Install new MPU BOARD_FRONT or MPU BOARD_BACK in reverse order.
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