A
Check by replacing the CCH card with spare
END
MAINTENANCE PROCEDURE
On the CCH card, set the MBR switch 
UP
.
On the CCH card, set the MB switch 
UP
and extract the card from its mounting slot.
Make switch setting on a new CCH card, referring to the replaced card.
On the new CCH card, set the MBR and MB switches 
UP
and insert the card into its mounting slot.
On the new CCH card, set the MB switch 
DOWN
.
On the new CCH card, set the MBR switch 
DOWN
.
Check whether the fault is still indicated.
Page 117
Issue 2
