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Problem | Remedy | |
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Noise bars “roll” up | Hum bars (ground loop) are caused by a difference in the ground potential | |
or down in the output | of any two or more devices connected to your signal path. This difference is | |
image | compensated by passing that voltage difference through any available | |
or: | interconnection, including your video cables. | |
| WARNING! | |
Low frequency hum |
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| Do not disconnect the ground from any piece | |
in the output signal |
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| of video equipment in your signal path! | |
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| Check the following to remove hum bars: | |
| 1. | Confirm that all interconnected equipment is connected to the same |
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| phase of power, if possible. |
| 2. | Remove equipment connected to that phase that may introduce noise, |
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| such as motors, generators, etc. |
| 3. | Disconnect all interconnect cables and reconnect them one at a time until |
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| the ground loop reappears. Disconnect the affected cable and replace, or |
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| insert an isolation transformer in the signal path. |
15.3 Audio Signal |
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Problem | Remedy | |
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No audio at the output | 1. | Confirm that your sources and output device are powered on and |
device, regardless of |
| connected properly. Audio signals connected to the input of your |
input selected |
| switcher should be properly wired to the output of your source. Audio |
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| signals connected to output of your switcher should be properly wired |
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| to the input of your switcher or recorder. |
| 2. | Confirm that any other switchers in the signal path have the proper |
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| input and/or output selected. |
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Audio level is too low | 1. | Confirm that the connecting cables are of high quality and properly |
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| built. Take special care in noting the wiring configuration of balanced |
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| to unbalanced cables. |
| 2. | Check level controls located on your source input device or output |
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| display or recorder. |
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15.4 Control
Problem | Remedy | |
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No control of switcher | 1. | Confirm the wiring of the connecting cable. Cable length should not |
from PC software |
| exceed 25 feet. |
| 2. | Confirm that all DIP switches on the switcher have been set properly. |
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| Keep in mind that if you are only controlling one switcher on a specific |
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| port, that switcher must be assigned the ID of “1”. |
| 3. | Confirm that the baud rate of your computer COM port is set to the |
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| same as that of your switcher |
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| COM port is selected in the control software. |
| 4. | Confirm that |
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| With custom software, do not send multiple commands at the same |
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| time. The switcher must complete one command before receiving |
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| another. |
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KRAMER ELECTRONICS, LTD. | 10 |