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Tektronix 485 User Manual
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123
125
Table of Contents
Default Chapter
2
Table of Contents
2
Specification
4
Introduction
4
Probe Performance
6
A and B Triggering
6
Horizontal Deflection
7
Calibrated Sweep Delay
7
Crt
8
Calibrator
9
Other Characteristics
9
Environmental Characteristics
9
General
10
Preliminary Information
10
Controls and Connections
10
Front Panel
10
Rear Panel
13
Bottom Side
13
Circuit Description
14
Introduction
14
1 Megohm Buffer a M P Lifie R
14
Signal Channel Switch
15
Internal Trigger Amplifier
15
Main Vertical Amplifier
15
Scale Factor Readout
16
Vertical Mode Control
16
Z Axis
16
A Trigger Amplifier
16
A E X T Trigger Identify
16
A Trigger Generator
17
B Trigger Generator
17
A and B Sweeps
17
Horizontal Amplifier
18
Horizontal Control
18
Power Inverter/Regulator
19
Line Filter
19
Line Input Circuit
19
Start Network
20
Inverter
20
Inverter/Regulator
21
Inverter Current Limiting Circuit
21
Overvoltage Stop Circuit
21
Line Stop Circuit and Surge Limiting
21
Procedure for Converting the 485 to DC Operation
22
Low Voltage Supplies
22
Power Supply Protection Circuit
23
Stop Monostable
23
Balance Node
24
Overcurrent Protection
25
Low Line Voltage Protection
25
Sampling Period Timer and Overvoltage Protection
25
CRT Circuit
25
Filament Voltage
25
High Voltage Supplies
25
Anode Supply
25
Cathode Supply
25
Cathode Regulator
25
Grid DC Restorer
26
Focus DC Restorer
26
Beam Current Limit
27
Power Supply Shutdown Caused by Excessive Beam Current
27
CRT Control Circuits
27
Auto Focus Circuit
27
Calibrator
28
Maintenance
29
Introduction
29
Cleaning
29
Lubrication
30
Visual Inspection
31
Semiconductor Checks
31
Recalibration
31
Troubleshooting
31
Introduction
31
Troubleshooting Aids
31
Circuit Boards
31
Troubleshooting Equipment
33
Troubleshooting Techniques
34
Special Troubleshooting Information
35
Corrective Maintenance
39
Obtaining Replacement Parts
39
Soldering Techniques
39
Component Replacement
40
Circuit Board Replacement
40
Timing Board Removal
40
Transformer Board Removal
41
Inverter Board Removal
42
Semiconductor Replacement
42
A. Circuit-Board Pins
42
C. End-Lead Pin Connectors
43
Cathode Ray Tube Replacement
43
Repackaging for Shipment
43
Interboard Comb Connection Locations
44
Calibration
45
Introduction
45
T E K T R O N IX Field Service
45
Using this Procedure
45
Test Equipment Required
45
Special Calibration Fixtures
45
Calibration Equipment Alternatives
45
Performance Check
45
Calibration Procedure
45
Rackmounting
69
Introduction
69
Rack Dimensions
69
Slide out Tracks
69
Mounting Procedure
69
Alternate Rear Mounting Methods
70
Removing or Installing the Instrument
70
Slide out Track Lubrication
70
Electrical Parts List
75
Diagrams and Circuit Board Illustrations
123
Change Information
193
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Tektronix 485 Specifications
General
Brand
Tektronix
Model
485
Category
Test Equipment
Language
English
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