Anritsu MS2665C - Section 4 MS2668 C

4-1
Section 4 MS2668C
4.1 Overall Circuit description ......................................................... 4-2
4.2 Troubleshooting......................................................................... 4-9
4.2.1 Introduction .................................................................... 4-9
4.2.1.1 Service kit........................................................ 4-9
4.2.1.2 Required equipment........................................4-9
4.2.1.3 Circuit reference..............................................4-10
4.2.2 Detecting faulty module .................................................4-15
4.2.3 Disassembling cabinet................................................... 4-16
4.2.4 Replacement of faulty module .......................................4-16
4.2.5 Adjustment after module replacement ........................... 4-16
4.2.5.1 Reference crystal oscillator adjustment .......... 4-16
4.2.5.2 Sweep adjustment .......................................... 4-16
4.2.5.3 IF Gain-1 (ATT), IF Gain-2 (AMP) of Internal
Mixer Band adjustment.................................... 4-22
4.2.5.4 IF Gain-1 (ATT), IF Gain-2 (AMP) of External
Mixer Band adjustment.................................... 4-25
4.2.6 Assembling cabinet........................................................ 4-26
4.2.7 Checking items after assembling cabinet ......................4-26
4.2.8 Frequency response compensation .............................. 4-26
4.3 Mechanical configuration........................................................... 4-27
4.3.1 Disassembling/Assembling cabinet ............................... 4-27
4.3.2 Removing/Assembling units and PC boards .................4-27
4.3.3 Disassembling/Assembling Components around RF Input ..... 4-27
4.3.4 Disassembling/Assembling Units and Components on
lower surface .................................................................4-27
4.3.5 Front unit disassembly/assembly .................................... 4-33
4.3.6 A09 OPTION BASE disassembly/assembly .................... 4-33
4.3.7 Removing/Assembling A0501 HI-SPEED AD
from A05 SCAN/AD .......................................................4-33
4.3.8 Connecting the cable to Diplexing Bandswitch
and F2626 (YTF) ...........................................................4-33