Tektronix 2445, Instruction Manual

Page: 7 / 351

2445 Service
LIST OF ILLUSTRATIONS
Figure Pa9e
The 2445 Oscilloscope................................................ ....................................................................v'*i
2-1 Line selector switch, line fuse, and detachable power cord........................................................... 2-2
2-2 Power and display c o n tro ls ............................................................................................................. 2-4
2-3 Vertical controls and CH 1 OR X and CH 2 connectors................................................................. 2-5
2-4 Channel 3 and Channel 4 controls and connectors and CALIBRATOR o u t p u t ....................... 2-6
2-5 Horizontal and delta measurement c o n tro ls ..................................................................................2-7
2-6 Trigger controls and indicators...........................................................................................................2-10
2-7 Rear-panel controls and connectors....................................................................................................2-13
2-8 Readout display locations................................................................................................................... 2-14
2-9 Graticule measurement m arking s...................................................................................................... 2-15
2- 10 Probe low-frequency compensation....................................................................................................2-19
3- 1 Block diagram.................................................................................................................................... 3-2
3-2 Address d e c o d in g ............................................................................................................................ 3-7
3-3 Accept address t im in g .....................................................................................................................3-11
3-4 Front-Panel Switch m a t r ix .................................................................................................................3-13
3-5 Scale Illum ination c ir c u it ................................................................................................................... 3-17
3-6 Sweep generator.................................................................................................................................. 3-22
3-7 Developing the readout d is p la y ......................................................................................................... 3-28
3-8 Readout display priorities................................................................................................................... 3-32
3-9 Timing o f Refresh P rioritizer.............................................................................................................. 3-33
3-10 Dc Restorer c ir c u it ............................................................................................................................. 3-38
3-11 Timing relationships o f the Inverter Drive signals............................................................................. 3-41
3-12 Simplified schematic o f control n e tw o rk ..........................................................................................3-42
6-1 M ultipin connector o rie n ta tio n ...................................................................................................... 6-6
6-2 Rear panel re m o va l..............................................................................................................................6-23
6-3 Ribbon cable removal........................................................................................................................... 6-24
9-1 Color codes fo r resistors and capacitors.
9-2 Semiconductor lead configurations.
9 3 Locating components on schematic diagrams and circuit board Illustration',
9-4 2445 block diagram.
9-5 A 5—Control board.
9-6 A6—Front Panel and A 7—Front Panel Variable boards.
9-7 Circuit view o f A 6—Front Panel.
9-8 A 1 —Main and A 8—Scale Illum ination boards.
9-9 A14—Dynamic Centering board.
9-10 A 4 — Readout board.
9-11 A 9 —High Voltage board.
9-12 A 2 —Regulator and A 3—Inverter boards,
9-13 A10—Fan Motor board.