Crown FM30 - Page 4

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Section 3—Operation................................................. 3–1
3.1 Initial Power-up Procedures ..............................................................................3–2
3.2 Power Switches.................................................................................................3–4
3.2.1 DC Breaker....................................................................................................3–4
3.2.2 Power Switch................................................................................................3–4
3.2.3 Carrier Switch ...............................................................................................3–4
3.3 Front Panel Bar-Dot Displays.............................................................................3–5
3.3.1 Audio Processor Input ..................................................................................3–5
3.3.2 Highband and Wideband Display ..................................................................3–5
3.3.3 Modulation Display .......................................................................................3–5
3.4 Input Gain Switches ..........................................................................................3–6
3.5 Processing Control............................................................................................3–6
3.6 Stereo-Mono Switch..........................................................................................3–6
3.7 RF Output Control .............................................................................................3–7
3.8 Digital Multimeter..............................................................................................3–7
3.9 Fault Indicators .................................................................................................3–8
Section 4—Principles of Operation................................. 4–1
4.1 Part Numbering.................................................................................................4–2
4.2 Audio Processor Circuit Board ..........................................................................4–3
4.3 Stereo Generator Circuit Board..........................................................................4–4
4.4 RF Exciter Circuit Board ....................................................................................4–6
4.5 Metering Circuit Board ......................................................................................4–8
4.6 Motherboard .....................................................................................................4–9
4.7 Display Circuit Board.......................................................................................4–10
4.8 Voltage Regulator Circuit Board ......................................................................4–11
4.9 Power Regulator Circuit Board ........................................................................4–12
4.10 RF Driver/Amplifier (FM30) .............................................................................4–12
4.11 RF Driver (FM100/FM250)............................................................................... 4–13
4.12 RF Amplifier (FM100/FM250) ..........................................................................4–13
4.13 Chassis ........................................................................................................... 4–14
4.14 RF Output Filter & Reflectometer.....................................................................4–14
4.15 Receiver Circuit Board Option .........................................................................4–15