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Appendix, cont’d
DVS 406 • AppendixA-6
4. Locate the firmware chip(s) to be replaced on the circuit board, as shown in
the following illustration.
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
firmware chip with the
angled corners of the
socket in the same
orientation as the old
chip.
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.
U41
Align Notches
U41
U57
U56