Bio-Rad CHEF Mapper® XA System - Manual (Page 3)

The CHEF Mapper requires a ROM chip upgrade in order to work properly after
December 31, 1999. This instruction sheet describes how to perform the Year
2000 upgrade.
This Kit Contains:
800-2428 rev E U12 Chip CHEF Mapper ROM V1.30
910-1667 Integrated Circuit Chip Puller
410-6145 Instruction Sheet
Note: This procedure requires removal of the ROM chip from the processor I/O board
(input/output board). Be sure to follow procedures to ground yourself before touching
any electronic components, to prevent static electricity damage to the board or chip. When
handling the replacement integrated circuit (chip), first ground yourself by touching the
metal chassis of the CHEF unit. It is important to do this to prevent damage to the
electronic components on the circuit boards.
Section 1
Replacement of the ROM Chip
Note: You should exit any program that may have been running on the CHEF Mapper
before beginning the procedure, so that the verification of the chip after its replacement
will work properly.
1. Unplug the CHEF Mapper power cord and, if the unit was previously powered within
the last 5 minutes, wait 3 minutes to be certain that all high-voltage has disappeared from
the system (all capacitors are discharged).
2. Remove the six screws identified below that hold the back panel to the CHEF Mapper.
3. Lay down the back panel, and unplug the cable which connects the back panel to the
CHEF Mapper. Set the back panel to the side.
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