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MAINTENANCE Orban Model 8400
Routine Maintenance
The 8400 OPTIMOD-FM Audio Processor uses highly stable analog and digital circuitry
throughout. Recommended routine maintenance is minimal.
1. Periodically check audio level and gain reduction meter readings.
Become familiar with normal audio level meter readings, and with the normal perform-
ance of the G/R metering. If any meter reading is abnormal, see Section 5 for trouble-
shooting information.
2. Listen to the 8400's output.
A good ear will pick up many faults. Familiarize yourself with the “sound” of the 8400 as
you have set it up, and be sensitive to changes or deterioration. But if problems arise,
please don't jump to the conclusion that the 8400 is at fault. The troubleshooting informa-
tion in Section 5 will help you determine if the problem is with OPTIMOD-FM or is
somewhere else in the station's equipment.
3. Periodically check for corrosion.
Particularly in humid or salt-spray environments, check for corrosion at the input and
output connectors and at those places where the 8400 chassis contacts the rack.
4. Periodically check for loss of grounding.
Check for loss of grounding due to corrosion or loosening of rack mounting screws.
5. Clean the front panel when it gets soiled.
Wash the front panel with a mild household detergent and a damp cloth. Do not use
stronger solvents; they may damage plastic parts, paint, or the silk-screened lettering. Do
not use paper-based cleaning towels, or use cleaning agents containing ammonia, or alco-
hol. An acceptable cleaning product is “Glass Plus.” For best results when cleaning the
lens, use a clean, lint-free cloth.
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