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A-5Digital Display Scaler • Reference Information
U24
U60
U67
U68
Figure A-2 — Locating the four firmware IC chips
6. For U60 or U24, align the hooks of a PLCC IC puller tool with the slots
located in opposite ends of the firmware chip.
7. Insert the hooks into the slots, and squeeze the tool
gently to grasp the chip.
8. Pull the chip straight out of the socket, and set it aside.
9. For U67 and U68, align the slots of the new firmware
chip with the angled corners of the socket in the same
orientation as the old chip. Gently, but firmly, press
the chip into place in the socket.
10. For U60 or U24, note the key (angled corner) of the new
firmware IC and the dot on the underside that
indicates pin 1 (figure A-3). Orient the IC to match the
key and pin 1 (indicated by arrow) on the socket, and
gently, but firmly, press the IC into place.
Key
Pin 1 mark Pin 1 mark
Socket
IC
Key
Figure A-3 — Key and pin 1 mark
11. Replace the top cover on the DDS 402, and fasten it with the screws that
were removed in step 3.
12. Rack/furniture mount the scaler, and reconnect the AC power cord.
U60 or
U24