Roland MC-505 Install Manual page 7

Roland MC-505 LCD Replacement Guide
Fig. 8 - Zip Tie which needs to be cut
Step 3:
Now that the case is opened locate the main board. This is the circuit board
with all of the ribbon cables connected to it shown in Fig. 6.
Disconnect all of the ribbon cables from the main board. Some of the
connectors need to be unlocked as shown in Fig. 7 you must pull up on
both sides of the connector to unlock and remove the cable. You will need
to cut the zip tie on the lower left corner of the board shown in Fig. 8.
After removing the cables, remove the three screws holding the main
board in place. Then remove the main board from the case and set it aside.
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