Extron Electronics MAV Series - Manual (Page 66)

Reference Information, cont’d
MAV Series Switchers • Reference Information B-4
If you choose to check for proper operation before putting the cover back
on, ensure that tools and hands are outside the switcher, and then connect
the power cord to the unit and to an AC source. The switcher should
power up normally. Unplug the AC power cord, and reinstall the
switcher.
7. Attach the power cord to the switcher and to the AC power source. Ensure
the switcher is working properly.
8. If the switcher was removed from a rack, remove its power cord, reattach the
switcher to the rack, and reconnect the power cord.
9 . Reconnect the input and output cables.
Installing a firmware update
The IC that contains the firmware for the matrix switcher also contains the
memory in which presets and audio levels are saved. When you replace the IC,
these settings will be lost. You may want to record the presets and audio levels
before you replace the IC.
To replace the firmware, do the following:
1. Follow the instructions in Opening the switcher on page B-2 for removing the
top cover, including the instructions for removing the front panel.
2. Locate the RS-232/RS-422 ribbon cable that connects the front panel board to
the rear panel RS-232/422 port (figure B-2). Note which receptacle on the
front panel board that the cable plugs into, and remove the cable from its
receptacle (see step 4 in Swapping the serial ports).
Do not touch the components inside the switcher without being electrically
grounded. Electrostatic discharge (ESD) can damage ICs, even if you cannot
feel, see, or hear it.
3. Unplug the power cable from the front panel board.
4. Place the front panel board, button side down, on a suitable workspace.
5. Locate IC U7 (see figure B-2).
6. Use the PLCC IC puller to remove the existing firmware IC. Squeeze the tool
to align its hooks with the slots in opposite corners of socket U7.
Insert the hooks, squeeze gently, and pull the IC straight out of the
socket. Set the IC aside.
7. Note the key (angled corner) of the new firmware IC and the
dot on the underside that indicates pin 1 (figure B-3). Orient
the IC to match the key and pin 1 (indicated by the arrow),
and carefully press the IC in place.
Key Pin 1 mark Pin 1 mark
Socket
IC
Key
Figure B-3 — Key and pin 1 mark
8. Reinstall the power cable that was removed in step 3.