Comprehensive CSW-HD880 - Manual (Page 16)

HDMI Matrix Switcher
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check the COM port number in the software and make sure the COM port is in good condition.
5) If there is not “beep” sound when switching the I/O signal, please make sure the beeper is
switched-on. If so, the beeper inside the matrix may be broken. Please send it to the dealer for
fixing.
6) When switching , the beeper beeps but without any output image
：
A. Check with oscilloscope or multimeter if there is any signal at the input end. If there is no signal
input, it may be the input connection cord broken or the connectors loosen.
B. Check with oscilloscope or multimeter if there is any signal at the output end. If there is no
signal output, it may be the output connection cord broken or the connectors loosen.
C. Please make sure the destination device is exactly on the controlled output channel
D. If it is still the same after the above checking, it may be something wrong in the switcher.
Please send it to the dealer for fixing.
7) If the output image is interfered, please make sure the system is earthed well.
8) If the static becomes stronger when connecting the HDMI connectors, it may be due to the
incorrect earthling of the power supply, Please earth it again correctly, and otherwise it would bring
damage to the switcher or shorten its natural life.
9) If the Matrix can not be controlled by the keys on the front panel, RS232 port or remote controller,
the host may has already been broken. Please send it to the dealer for fixing.