. Various 8200 Section 4 free download

File name 8200_Section_4.pdf

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 sa