Appendix, cont’d
4.Locate the firmware chip(s) to be replaced on the circuit board, as shown in the following illustration.
U57
U41
Locating the three firmware IC chips
5.After you are electrically grounded, the U56 or U57 IC chips may be removed by grasping it firmly with your fingers and pulling it out, then continuing to step 8.
Removal of the U41 IC chip requires a PLCC IC puller tool. To remove the U41 chip, align the hooks of a PLCC IC puller tool with the slots located in opposite ends of the U41 firmware chip.
6.Insert the hooks into the slots, and squeeze the tool gently to grasp the chip.
7.Pull the chip straight out of the socket, and set it aside.
8. Align the slots of the new 
Align Notches firmware chip with the
angled corners of the socket in the same orientation as the old chip.
U56
U41
9.Gently, but firmly, press the chip into place in the socket.
10.Replace the top cover on the DVS 406 scaler, and fasten it with the screws that were removed in step 3.
11.Rack/furniture mount the scaler, connect the input/output cables, and reconnect the AC power cord.