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OPTIMOD-FM 8200 MAINTENANCE
4-1
Section 4
Maintenance
page contents
4-2 Routine Maintenance
4-3 Getting Inside the Chassis
4-3 Front panel -- open and close
4-4 Rear panel -- remove and replace
4-5 Input Filter Board -- remove, replace
4-6 D-Connector Board -- remove, replace
4-6 Power Supply -- remove, replace
4-7 In-System Testing ("Proof of Performance")
4-8 Monophonic Performance Verification
4-9 Stereo Performance Verification
4-15 Field Audit of Performance
4-19 Field Alignment
4-20 Prepare the Unit
4-20 Test Power Supplies (optional)
4-22 Calibrate and Test Card #1 (Analog Input/Output Circuitry)
4-24 Calibrate and Test Card #2 (Analog Stereo Baseband Encoder)
4-28 Figure 4-1: Separation Scope Trace
4-29 Return OPTIMOD-FM to Service
CAUTION
The installation and servicing instructions in this manual are for
use by qualified personnel only. To avoid electric shock do not
perform any servicing other than that contained in the Operating
Instructions unless you are qualified to do so. Refer all servicing
to qualified service personnel.
4-2 MAINTENANCE OPTIMOD-FM 8200
page
Routine Maintenance
The 8200 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 trou-
bleshooting information.
2. Listen to the 8200's output.
A good ear will pick up many faults. Familiarize yourself with the "sound" of the 8200
as you have set it up, and be sensitive to changes or deteriorations. But if problems arise,
please don't jump to the conclusion that the 8200 is at fault. The troubleshooting
information 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 8200 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. Stronger
solvents should not be used because they may damage plastic parts, paint, or the
silk-screened lettering (99% isopropyl alcohol can be safely used).
OPTIMOD-FM 8200 MAINTENANCE
4-3
Getting Inside the Chassis