Watlow MLS - Manual (Page 128)

116 MLS User’s Guide
Troubleshooting
Changing the EPROM
Changing the EPROM involves minor mechanical disassembly and
reassembly of the controller, but you don't need any soldering or
electrical expertise. You'll need a Phillips head screwdriver and a small
flathead screwdriver.
NOTE
If you change the EPROM, you must perform a
manual controller reset for the EPROM change to
take effect. A manual controller reset changes all
controller parameters back to their default values,
so you must reenter the desired values from ANA-
SOFT or from the controller's front panel after
you change the EPROM.
1. Power down the controller. Be sure to take antistatic precautions.
2. Remove the two or four screws from the sides of the controller front
panel and remove the two screws from the top of the case, as shown
below.
3. Remove the electronics assembly from the case, as shown below.
4. Unscrew the four screws at the corners of the top board and carefully
unplug this board to access the bottom board (processor board). The
next figure shows the screws to remove: