Tektronix 4 Series Service Manual page 3

Contents
Important safety information..........................................................................................................................................................5
General safety summary........................................................................................................................................................5
To avoid fire or personal injury............................................................................................................................................... 5
Probes and test leads............................................................................................................................................................ 7
Service safety summary.........................................................................................................................................................7
Terms in this manual.............................................................................................................................................................. 8
Terms on the product............................................................................................................................................................. 8
Symbols on the product......................................................................................................................................................... 8
Preface..........................................................................................................................................................................................9
Supported products................................................................................................................................................................9
Where to find operating information.......................................................................................................................................9
Theory of operation..................................................................................................................................................................... 10
Power supply....................................................................................................................................................................... 10
Processor board...................................................................................................................................................................10
Main board........................................................................................................................................................................... 11
Front panel, display, and Probe Interface Board (PIB).........................................................................................................11
Maintenance................................................................................................................................................................................12
Preventing ESD................................................................................................................................................................... 12
Adjustment procedures........................................................................................................................................................ 12
Inspection and cleaning....................................................................................................................................................... 13
Exterior cleaning (other than display)........................................................................................................................... 13
Flat panel display cleaning........................................................................................................................................... 13
Interior cleaning............................................................................................................................................................ 14
Lubrication.................................................................................................................................................................... 14
Returning instrument for service...................................................................................................................................15
Removal and replacement procedures................................................................................................................................ 15
Required equipment..................................................................................................................................................... 15
Remove the front-panel knobs......................................................................................................................................16
Remove instrument feet................................................................................................................................................17
Remove the handle.......................................................................................................................................................18
Remove the rear grill and case.....................................................................................................................................19
Remove the rear chassis assembly..............................................................................................................................21
Remove the power supply bracket................................................................................................................................23
Remove the power supply............................................................................................................................................ 25
Remove the main fan assembly....................................................................................................................................28
Remove the processor board........................................................................................................................................29
Remove the main board................................................................................................................................................30
Troubleshooting................................................................................................................................................................... 32
Service level................................................................................................................................................................. 32
Check for common problems........................................................................................................................................32
Troubleshooting flow chart............................................................................................................................................33
Check that the instrument passes power-on self tests................................................................................................. 34
Download and install the latest instrument firmware.....................................................................................................34
After repair.................................................................................................................................................................... 34
4 Series B MSO (MSO44B and MSO46B) Service Manual
Contents
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