Reference Information, cont’d
Firmware Upgrade Installation
In some cases the ISM’s firmware may require replacement with an updated version. There are nine
•Chip set U1 and U2 are replaced as a pair.
•Chip U6 is replaced alone.
•Chip set U98, U99, U100, and U101 are replaced as a set.
•Chip set U102 and U103 are replaced as a pair.
CAUTION
Changes to firmware must be performed by authorized service personnel only. Some ISM firmware updates must be performed at the Extron factory.
Replace firmware in the ISM as follows:
1.Disconnect the AC power cord from the ISM to remove power from the unit.
To prevent electric shock, always unplug the ISM from the AC power source before opening the enclosure.
2.If the ISM is installed in a rack, disconnect all signal and control cables and remove the ISM from the rack.
3.Remove the 16 screws, 8 on the top and 4 on each side of the ISM cover (figure
4. Remove the top two front panel screws.
5. Lift the top cover straight up approximately five inches until you can access the fan power cords.
CAUTION
Do not touch any switches or other electronic components inside the ISM. Doing so could damage the switcher. Electrostatic discharge (ESD) can damage IC chips even though you cannot feel it. You must be electrically grounded before proceeding with firmware replacement. A grounding wrist strap is recommended.
6. Disconnect the two fan power cords from connectors J8 and J13 on the main board.
7. | Lift the top cover out of the way. |