Harmonic HRR 4104, Product Manual

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HRR 4104 Return Path Receiver Product Manual Rev A (3/05) 5–1
5
Maintenance and Troubleshooting
This chapter describes:
• How to clean fiber optic connectors
• How to troubleshoot the HRR 4104
• How to return the unit for service
• Manufacturer disclaimer
• Warranty summary
• Limitations of the warranty
• Exclusive legal remedies
NOTE: The HRR 4104 does not include any customer-serviceable
components.
5.1 Cleaning Fiber Optic Connectors
DANGER: The fiber cable carries invisible laser radiation. This product does
not contain a laser, but is used in systems that contain lasers.
AVOID EXPOSURE TO THE BEAM. Never operate a unit that
has a broken fiber or a disconnected fiber connector.
Dirty optical connectors are the leading source of poor performance in a
broadband optical fiber network. Dirty optical connectors lead to optical
signal loss and reflections, which in turn can seriously degrade carrier-to-
noise (CNR) performance and, in some cases, distortion performance.
Harmonic recommends that you clean all mating fiber connectors, before
connecting them to an optical receiver.
In addition, if you suspect that the optical connector of an HRR 4104 may
have been exposed to contamination (by a dirty fiber cable connector, for
example), you should properly clean the HRR 4104 optical connector before
connecting the optical fiber.
CAUTION: Improper cleaning of an optical connector can do more harm
than good. Never spray a clean-air product onto the surface of
an optical connector. Spraying air onto an optical connector can
cause condensation on the connector surface, leaving water
spots and trapping dust.