Appendix
Troubleshooting
Operation problems can be due to a variety of causes. The first step in solving them is to make sure that all cables are securely attached and seated completely in their sockets.
Symptom | Possible Cause | Action |
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Erratic behavior. | Unit not receiving | Use a DC 5.3 V power adapter if you |
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| enough power. | are not already using one. If you are | |
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| already using a power adapter, check | |
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| that it matches the system | |
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| specifications, and that it is plugged in | |
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| and functioning properly. | |
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| Keyboard and/or | Unplug the cable(s) from the console | |
| mouse need to be | port(s), then plug it/them back in. | |
| reset. |
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| No connection to the | Check the cable from the switch to the | |
| computer. | computer to make sure it is properly | |
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| connected. | |
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| KVM switch needs to | Power off all devices on the | |
| be reset. | installation; power off the KVM switch; | |
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| wait five seconds; then power up. | |
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USB devices not | USB ports need to be | Unplug the device’s USB cable from | |
responding. | reset. | the USB port on the switch’s rear | |
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| panel, then plug it back in. | |
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| Use the USB Reset hotkey | |
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| combination (see page 17), to reset | |
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| the USB ports. | |
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Cannot switch ports | Keyboard is | Switch to the alternate port switching | |
by pressing [Scroll | incompatible with | keys. See Alternate Hotkey Setting | |
Lock] twice | Scroll Lock | ||
| invocation. |
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Monitor does not | Some HDMI/DVI | Power off all devices on the | |
display after KVM | graphics cards are | installation; power off the CS72D / | |
cable set is hot | incompatible with | CS74D; confirm all KVM cables are | |
plugged. | cable set hot | properly connected; power on the | |
| plugging. | CS72D / CS74D; power on the | |
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| computers | |
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When switching ports, | Monitor is new or this | Switch ports again and wait two or | |
the monitor does not | is the first time | more seconds for the PC’s EDID to | |
display. | installation. | pass to the monitor. | |
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| The monitor’s EDID | Use the [d] hotkey to invoke Video | |
| has not passed | DynaSync one more time or switch to | |
| through to the PC | another PC to reconnect the CS72D / | |
| when switching ports | CS74D. See Hotkey Summary Table, | |
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