Ross ACO-4400A, User Manual, Page: 53 / 112

ACO-4400A User Manual (Iss. 03) Operating Basics • 4–9
Troubleshooting
The ACO-4400A is reliable under normal steady state operating conditions. If you are having
problems, select the symptom from the list below that closely relates to your particular problem,
and perform the checks / actions listed.
If your problem is not resolved after following these checks / actions, the fault is likely to be
related to a mechanical or electrical component failure. Please contact Ross Technical Support for
further assistance.
Notice
— Observe all cautions and warnings listed in the front of this manual.
Table 4.2
Symptom Cause(s) Checks/Actions
LCD not operational
No changeover action
• Mains Power missing
• SMPSU faulty
• Bad power connection(s)
• Check Mains Power
• Check Mains lead integrity
• Check rear panel Mains fuse
• Check SMPSU fuse
Intermittent Operation Bad power connection(s) Check Mains Power connections
Corrupted output(s) Bad inputs Check signal sources
“Random” changeover • Calibration value(s)
corrupted
• Wrong signal type selected
• Contact Ross Video regarding re-calibration
• Select signal type(s) to suit input signals