Mitsubishi Melsec-Q Series User Manual page 292

(2) Replacing Q3MEM-4MBS and Q3MEM-8MBS
Backup the program and the
data.
Remove a memory card
protective cover of the CPU
module at power-on status of
the programmable controller.
With a flat-blade screwdriver, etc.,
remove the battery holder locking
switch from the LOCK position.
Remove the battery holder from
the SRAM card.
Remove the old battery from its
holder.
Insert a new battery into the
holder in the correct direction.
Deeply insert the SRAM card
into the battery holder.
Set a battery holder fixing switch
to the LOCK position
Set the memory card protective
cover on the CPU module.
SD52 to check if bit 1 and bit
Failure of SRAM card battery
11 - 32
Replacing battery
Monitor
SM52 to verify on/off.
ON
Monitor
2 are ON.
Bit 1 and bit 2 are ON.
Figure 11.9 Replacing Q3MEM-8BAT
CPU module
main unit
CPU module
main unit
CPU module
main unit
OFF
Bit 1 and bit 2 are OFF.
Remove a caver,
pressing fixing claws
of top/bottom
Battery holder
Release
direction
Battery holder
fixing switch
Facing "+ (positive)"
up, install the battery
LOCK
Battery holder
fixing switch
Completed