OPTIMOD
I-5
Problems and Possible Causes................................................. 5-2
RFI, Hum, Clicks, Or Buzzes..................................................................................5-2
Poor Peak Modulation Control ..........................................................................5-2
Audible Distortion On-Air.....................................................................................5-2
Audible Noise On-Air...........................................................................................5-3
Shrill, Harsh Sound ................................................................................................5-3
System Receiving 6200’s Output Will Not Lock................................................5-4
System Will Not Pass Line-Up Tones at 100% Modulation................................5-4
System Will Not Pass Emergency Alert System (“EAS” USA Standard)
Tones at the Legally-Required Modulation Level........................................5-4
General Dissatisfaction with Subjective Sound Quality..................................5-4
Excessively Loud Commercials (DTV applications).........................................5-4
Inconsistent Levels (DTV applications).............................................................5-5
Incorrect Lip Sync (DTV Applications)...............................................................5-5
Troubleshooting IC Opamps..................................................... 5-5
Technical Support ...................................................................... 5-6
Factory Service........................................................................... 5-6
Shipping Instructions .................................................................. 5-7
Specifications ............................................................................. 6-2
Circuit Description...................................................................... 6-6
Overview...............................................................................................................6-6
12.288MHz Oscillator and System Clocking .....................................................6-6
1 Microprocessor and Power Monitoring Circuit ...................................6-8
2 RAM, ROM and EEPROM........................................................................6-9
3 Data Latches, Tri-State Data Buffers and Address Decoders...........6-9
User Control Interface and LED Display Circuits..............................................6-9
1. Remote and RS-232 Interfaces............................................................6-10
2. Switch Matrix and LED Indicators........................................................6-10
3. LED Meter Circuits..................................................................................6-10
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