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A-5QSD 204 • Appendix
Firmware Upgrade Installation
In some cases the QSD 204’s firmware may require replacement with an updated
version. There are three user-replaceable firmware chips: U41 — the main
microcontroller, U38, and U17. The numbers are printed on the circuit board. We
recommend that you send the unit to Extron for service and updates.
Changes to firmware must be performed by authorized service personnel
only. Some QSD 204 firmware updates must be performed at the
Extron factory.
Follow these steps to replace firmware in the decoder.
1. Disconnect the AC power cord from the QSD 204 to remove power from the
unit.
To prevent electric shock or damage, always unplug the QSD 204
decoder from the AC power source before opening the enclosure.
2. Remove the decoder from the rack or furniture.
3. Remove the cover of the decoder (the top half of the enclosure) by removing
the screws, then lifting the cover straight up.
1
QSD 204
DIGITAL QUAD-STANDARD DECODER
2
3
4
BRT/
CONT
COL/
TNT
BLANKING
CENTER
MENU
NEXT
ADJUST
Lift Cover
Straight Up
Remove (4)
Screws from
Top
Do not touch any switches or other electronic components inside the
decoder. Doing so could damage the decoder. 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.
4. Locate the firmware chip(s) to be replaced on the circuit board, as shown in
the following illustration.