MITSUBISHI ELECTRIC P500YMF-C - Manual (Page 101)

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[2] BC Controller Disassembly Procedure
(1) Service panel
Be careful on removing heavy parts.
Procedure Illustrations
1. Remove the two screws securing the electric panel
box.
Loosen the two screws securing the electric panel
box, and then remove the box.
2. Remove the four screws securing the front panel
and then remove the panel.
3. Remove the nine screws securing the ceiling panel
and then remove the panal.
(2) Control Box
Removing the two screws that secures the electric
panel box cover provides access to the controller
board and all of the relay board for checking. So it
is not necessary to work according to above 2.
Procedure Photos
Be careful on removing heavy parts.
Front panel
Ceiling panel
Loosen only
Erectric panel box