Specifications

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ACS253A-CT
Chapter 7: Troubleshooting
7. Troubleshooting
7.1 Video
Problem: There isn’t a picture.
Possible Causes/Solutions:
Check the power supply connection at the local unit. Is the Device Ready (Red LED) at the local unit illuminated (see Section 3.3)?
If not, the internal power-supply may be damaged or there may be an internal error.
Check the power supply connection at the remote unit. Is the Device Ready (Red LED) at the Remote unit illuminated (see Section
3.3)? If not, the internal power supply may be damaged or there may be an internal error.
Check that the interconnection cable is connected at the local unit and the remote unit. Is the Link Status LED illuminated? (See
Section 3.3.) If not, there may be a problem with the interconnection cable:
• Fiber models: Check that the fiber optic cable is connected correctly. The strand connected to the local unit’s TX (left-hand
connector) must run to the remote unit’s RX (right-hand connector) and vice versa.
• Fiber models: There may be one or more broken fibers. Do NOT look into a fiber’s end directly while it is connected to a local or
remote unit! Are the Link Status LEDs at the local unit AND at the remote unit illuminated? If they are flashing, check for broken
fibers by using a flashlight.
• Fiber models: Are the cables of the recommended fiber type? If you used your own fiber optic cable (not supplied by Black
Box), make sure that you have used 50µ or 62.5µ fiber with a multimode device or a 9µ fiber with a single-mode device. Other
fiber types and poly-fibers are not supported.
• CATx models: Check that you have wired the cable “straight-through.” “Cross-pinned” cables will not work.
• CATx models: Check that the cable is correctly wired. Use a CATx cable tester for checking incorrectly wired or broken strands.
Check that you are using a supported video mode (see Appendix D: Video Modes and Frame Rates). At the Remote Unit, is the
Video Signal LED illuminated? (See Section 3.3).
Check your total system configuration. Local units digitize incoming VGA signals and must receive perfect SYNC signals: no
glitches, spikes or deformed signals are allowed. Long/wrong or bad cables, or additional components like Splitters or KVM
Switches may deform the SYNC signals.
Also check that the signals (level and signal form) match the VESA Standard requirements.
Problem: There is horizontal jitter on the picture.
Possible Cause/Solution: The pixel clock and/or phase is misaligned: Refer to Section 6.2.
Problem: Characters are smeared.
Possible Cause/Solution: The phase is misaligned: Refer to Section 6.2.
Problem: Thin vertical lines are missing.
Possible Cause/Solution: The phase is misaligned: Refer to Section 6.2.