AR 10052381, Operating And Service Manual

Page: 16 / 60

Model 125W1000A
ii
2.10.9 Operating Hours (Power ON) Query .................................................................... 24
2.10.10 Faults Query ......................................................................................................... 24
2.10.11 Reset Faults .......................................................................................................... 24
2.10.12 SBB (Piggyback) Firmware Query ...................................................................... 26
2.10.13 System Serial Number Query ............................................................................... 26
3. THEORY OF OPERATION ............................................................................. 27
3.1 Introduction .......................................................................................................... 27
3.2 RF Amplifier Operation ....................................................................................... 27
3.2.1 A1 Variable Gain Amplifier (Schematics 10033907, 10031968, 10035521) ...... 27
3.2.2 A2 Final Dual W-module ..................................................................................... 28
3.3 Power Supplies (PS1, PS2, PS3) .......................................................................... 28
3.4 Control System ..................................................................................................... 29
3.4.1 A7 Control/Fault Board (Schematic 10025460) ................................................... 29
3.4.2 A8 Interface Board ............................................................................................... 29
4. MAINTENANCE ............................................................................................... 31
4.1 General Maintenance Information ........................................................................ 31
4.2 Disassembly Procedure ........................................................................................ 31
4.3 Troubleshooting ................................................................................................... 32
4.3.1 General - Reading Faults ...................................................................................... 33
4.3.2 The Unit Cannot Be Operated Remotely.............................................................. 33
4.3.3 Thermal Fault (Diagram No 10052988) ............................................................... 33
4.3.4 Interlock Fault (Diagram No. 10052988) ............................................................. 33
4.3.5 Amplifier Faults (Diagram 10052988) ................................................................. 34
4.3.6 Low or No Power Output (DC Tests) (Diagram 10052988) ................................ 34
4.3.7 Low or No Power Output (RF Test) (Diagram 10052988) .................................. 35
4.4 Spare Parts List ..................................................................................................... 36
FIGURES
2-1 Model 125W1000A Front Panel ............................................................................ 6
2-2 Model 125W1000A Rear Panel ............................................................................. 6
4-1 Typical Response @ -20 dBm Input .................................................................... 35
4-2 Typical Response @ 0 dBm Input ........................................................................ 35
4-3 Typical Pre-Amp Response .................................................................................. 36
4-4 Typical A2 Quad Amp Driver Response.............................................................. 36
4-5 Typical A1 Pre-Amp and A2 Quad Amp Driver Response ................................. 37
4-6 Typical A3 Quad Amp Gain Response ................................................................ 37