Allen&Heath GL4000 SERVICE MANUAL - Manual (Page 34)

Allen & Heath AP2794 issue 3 10
TESTING THE CONSOLE
17. The fitting of the expander module is now complete. Before re-plugging the console, apply power and check
for correct operation e.g. mutes & PFL LEDs illuminate.
Please note; to prevent damage to the console chassis, the expanded console must be supported along
its entire length.
Should you experience any difficulties in fitting this module or have any queries regarding your GL4000 console
please contact your ALLEN & HEATH agent. Include the console serial number in any correspondence.