AR 10045879, Operating And Service Manual

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Model 250U1000
ii
3. THEORY OF OPERATION ............................................................................. 23
3.1 Introduction .......................................................................................................... 23
3.2 RF Amplifier Operation ....................................................................................... 23
3.2.1 A1 2W Pre-Amplifier Assembly (Schematic No. 10041189, 10041352, 10041055)
.............................................................................................................................. 23
3.2.1.1 A1 Pre-Amplifier Assembly (Schematic 10041189) ..................................... 23
3.2.1.2 A2 Switch Assembly (Schematic 10041352) ................................................ 23
3.2.1.3 A3 2W Amplifier Assembly (Schematic 10041055) ..................................... 23
3.2.2 A2 U Series Driver Module (Schematic 10041561) ............................................ 24
3.2.3 A3 Four-Way Splitter ........................................................................................... 24
3.2.4 A4 thru A7 U Series Final Module (Schematic 10042997) ................................. 24
3.2.5 A8 Four-Way Combiner ....................................................................................... 25
3.3 Power Supplies (PS1, PS2) .................................................................................. 25
3.4 Control System ..................................................................................................... 25
3.4.1 A12 Control/Fault Board (Schematic #10042218)............................................... 25
3.4.2 A14 Interface Board (Schematic #10020073) ...................................................... 25
4. MAINTENANCE ............................................................................................... 27
4.1 General Maintenance Information ........................................................................ 27
4.2 Disassembly Procedure ........................................................................................ 27
4.3 Troubleshooting ................................................................................................... 28
4.3.1 General - Reading Faults ...................................................................................... 29
4.3.2 The Unit Cannot Be Operated Remotely .............................................................. 29
4.3.3 Thermal Fault (Schematic Diagram No 10042997, 10044731) ........................... 29
4.3.4 Interlock Fault (Schematic Diagram No. 10044731) ........................................... 29
4.3.5 Amplifier Faults (Schematic Diagram Nos. A2 – 10042781 and 10041561; A4 thru A8 -
10042997 and 10044731) ..................................................................................... 30
4.3.6 Low or No Power Output (DC Tests) (Schematic Diagram No. 10041189, 10044731)
.............................................................................................................................. 30
4.3.7 Low or No Power Output (RF Test) (Schematic Diagram No. 10041561 and 10042997)
.............................................................................................................................. 31
FIGURES
2-1 Model 250U1000 Front Panel ................................................................................ 7
2-2 Model 250U1000 Rear Panel ................................................................................. 8
2-3 Menu Map .............................................................................................................. 9
4-1 Typical Response at -20dBm Input ...................................................................... 31
4-2 Typical Response at 0dBm Input ......................................................................... 31
4-3 Typical U Final Module Response ....................................................................... 32
4-4 Typical Driver Module Response ......................................................................... 32
4-5 Typical A1 Pre-Amplifier Response .................................................................... 33
TABLES
2-1 RS-232 Port Settings ............................................................................................ 11
2-2 RS-232 (DCE) Port Pinout Diagram DB-9 Female.............................................. 11
2-3 Fiber-Optic Port Settings ...................................................................................... 12
2-4 Relationship between 4U MPC Controls and Remote Communication ............... 14
2-5 States .................................................................................................................... 17