Watlow CLS - Manual (Page 120)

112 CLS User’s Guide
Troubleshooting
2. Remove the two screws from the sides of the controller front panel.
3. Remove the electronics assembly from the case, as shown below.
4. Unscrew the four screws at the corners of the top board and care-
fully unplug this board to access the bottom board (processor
board), as shown below.
5. Find the installed EPROM. This is a 28 pin socketed chip which
should have an Watlow Anafaze label on top of it. (If there is no
label, a small window will be visible in the middle of the top of the
chip.) Do not confuse the EPROM with the RAM; the RAM also
has 28 pins, but it's in high profile socket, and it does not have a
label or a window. (The component designation U2 is printed on
the processor board next to the EPROM socket.) The next figure
shows the EPROM and RAM chip.
E
P
R
O
M
R
A
M