FUJITSU FD-1008AT - Manual (Page 41)

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Symptom Cause Action
Cascaded
connections are not
recognized. A problem has occurred at the
switcher. Press the reset switch.
(Both the slave and the master)
The OSD display
flashes at 5-second
cycles. No image (H/V Sync) signal from
server (suspended state) Input image (H/V Sync) signal.
Or, switch to server having an
image (H/V Sync) signal.