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3.7 How to Replace the Program BUTTON Board, OSD BUTTON Board &
AUDIO INTERFACE & DOWNLOAD 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 (63) on the flat and clean surface
so that the LCD screen faces downward.
Program BUTTON Board
5) On the side of the PROGRAM BUTTON Board (10), disconnect the PROGRAM BUTTON
CABLE (CB19) which is connected between the MPU_BOARD_FRONT (13) and PROGRAM
BUTTON Board (10)
6) Remove the PROGRAM BUTTON Board (10) from the DISPLAY BUTTON_LCD (9) by
unscrewing three screws (12).
7) Install new PROGRAM BUTTON Board (10) in reverse order.
OSD BUTTON Board
5) On the side of the OSD BUTTON Board (11), disconnect the OSD BUTTON CABLE (CB21)
which is connected between the A/D Board (8) and OSD BUTTON Board (11),
6) Remove the OSD BUTTON Board (11) from the DISPLAY BUTTON_LCD (9) by unscrewing
three screws (12).
7) Install new OSD BUTTON Board (11) in reverse order.
AUDIO INTERFACE & DOWNLOAD Board
5) Disconnect the AUDIO OUT CABLE (CB21) and DOWNLOAD CABLE (CB10) from the side
of the AUDIO INTERFACE & DOWNLOAD Board (24).
6) Remove the AUDIO INTERFACE & DOWNLOAD Board (24) from the DISPLAY
BUTTON_LCD (9) by unscrewing three screws (12).
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