Minolta pmn Instruction Manual page 26

Be careful not to open the card slot/battery chamber cover or disconnect the AC
adapter cable while the camera is in use. The CF card can sustain damage if the
camera loses power while data is being written to the card (while the green focus
lamp blinks slowly). In such a case, re-format the CF card on a personal computer
after transferring the image data from the CF card to the personal computer.
COMPACT FLASH CARD - CONT'D
Fold the battery/card-chamber
door down and slide it slightly
toward the front of the camera.
Then, while using a downward
pressure, slide it back to the rear
of the camera until it clicks.
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