Panasonic KX-P8420 - Manual (Page 200)

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The printer controller board ships with the following memory configuration:
• The DIMM slot numbered J1, is reserved for the printer’s system software
ROM DIMM.
• The DIMM slot numbered J8 contains a 16 MB SDRAM DIMM.
• The remaining two slots, J2 and J3 are empty.
Additional SDRAM DIMMs may be purchased for your printer in 16 or
32 MB configurations, allowing your printer a maximum memory
configuration of 80 MB of SDRAM.
To install a SDRAM DIMM you will need to remove the printer controller
board, install the SDRAM DIMM, then replace the controller board in the
printer. For instructions, see “Removing and replacing the printer controller
board” on
page 193 .
Installing SDRAM
DIMMs
The lever may be only on one side
of each socket.
J8 (Standard DIMM)
J1 (ROM DIMM)
J2 (Empty)
J3 (Empty)