Watlow CLS - Manual (Page 121)

Troubleshooting
CLS User’s Guide 113
6. Remove the existing EPROM from its socket by prying it out with a
small flathead screwdriver, as shown below.
7. The EPROM is shipped with its legs bent at an angle that best fits
its packaging. Bend the legs slightly so that the legs line up with the
holes in the EPROM socket. Don't try to bend the legs one at a
time; instead, gently press the legs against a flat surface until they're
at a 90-degree angle to the EPROM body, as shown below.
8. Carefully insert the new EPROM into the EPROM socket. Make
sure that the chip is oriented so that its notch faces the same way as
the part outline on the board.
9. Reverse steps 2 through 4 to reassemble the unit.
10. Do a No key reset to reinitialize the battery backed RAM. You must
perform a No key reset for the unit to operate properly. (To do a No
key reset, power down the controller. Then press the No key and
power up the controller.)