Canon FAX L1000 Service Manual page 411

FAX-L1000 Chapter 5: Appendix
b-3) Attaching memory boards
(1) To disable memory backup, remove the jumper plug on the SCNT board jumper
switch (JP1).
When the jumper plug is attached to the SCNT board jumper switch (JP1)
even when the power is turned off, the voltage of the Vanadium-Lithium
secondary battery is still being output to the memory extension connector
(J1). If a memory board is loaded in this condition, the memory IC will
suffer damage, so be sure to remove the jumper plug.
Jumper plug (JP1)
JP2
Figure 5-9 DRAM Boards Installation (1)
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