Tektronix 492 Service Manual

492/492P Service Vol. I (SN B030000 & up)
Section 3
TABLE OF CONTENTS (cont)
CALIBRATION (cont) Page Section 3 CALIBRATION (cont) Page
13. Check Resolution Bandwidth 16. Band Leveling for Coaxial Bands
and Shape Factor....................
3-23
(Bands 1—5)............................
3-71
14. Check Sensitivity ......................
3-24
17. Band Leveling for Waveguide
15. Frequency D rift........................
3-26
Bands (Bands 6 —11) ..............
3-72
16. Check Residual FM .................. 3-27
18. Preselector Driver (Option 01)
17. Check Intermodulation
Calibration ...............................
3-73
Distortion .................................
3-28
19. Phaselock Calibration .............. 3-76
18. Check Harmonic Distortion .... 3-29
19. Check Noise Sidebands ..........
3-30
20. Check Residual Response ....
3-30
21. Check LO Emission Out the RF
Section 4 MAINTENANCE
INPUT .....................................
3-31
Introduction .....................................
4-1
22. Check Digital Storage
Static-Sensitive Components ..........
4-1
(Option 02) ...............................
3-31
PREVENTIVE MAINTENANCE ............
4-2
23. Check Triggering Operation
Elapsed Time Meter........................
4-2
and Sensitivity.......................... 3-31
Cleaning .........................................
4-2
24. Check External Sweep
Lubrication .....................................
4-2
Operation ................................. 3-32
Service Fixtures and Tools for
25. Check Vertical Output ..............
3-34
Maintenance ...................................
4-2
26. Check Horizontal Signal
Visual Inspection............................
4-3
Output .....................................
3-34
Transistor and Integrated Circuit
27. 492P GPIB Verification
Checks ...........................................
4-3
Program ...................................
3-34
Performance Checks and
DJUSTMENT PROCEDURE ............ 3-42
Recalibration ...................................
4-3
1. Check and Adjust Low Voltage
TROUBLESHOOTING..........................
4-3
Power Supply ............................ 3-43
Troubleshooting Aids......................
4-3
2. Crt Display (Z-Axis & High Voltage
General Troubleshooting
boards) .......................................
3-44
Techniques .....................................
4-5
and frequency response) ............ 3-45
CORRECTIVE MAINTENANCE ..........
4-7
4. Adjust Sweep Timing ................
3-47
Obtaining Replacement Parts ..........
4-/
5. Calibrate 1st LO System and
Parts Repair and Return Program . .
A-l
Center Frequency Control .......... 3-50
Soldering Techniques......................
4-7
6 . Check 2nd LO Frequency and
Replacing Square Pin for Multi-pin
Adjust Tuning Range ..................
3-53
Connectors......................................
4-/
7. Adjust 1 st Converter Bias ..........
3-57
Selected Components....................
4-8
8 . Baseline Leveling (Video
Installing Matched Crystals for the
Processor) ................................. 3-58
VR 100 Hz Filters............................
4-8
9. Log Amplifier Calibration ............ 3-61
Replacing EPROM’s or ROM’s ....
4-8
10. Calibrating Resolution Band
Firmware Version and Error
width and Shape Factor ..........
3-63
Message Readout ..........................
4-8
11. Presetting Variable Resolution
Servicing the VR Module ................
4-8
Gain and Band Leveling ..........
3-66
REPLACING ASSEMBLIES AND
12. Calibrator Output Level ............
3-68
SUBASSEMBLIES .............................
4-10
13. IF Gain Calibration .................... 3-68
Removing and Replacing Semi-rigid
14. Digital Storage Calibration ....
3-69
Coaxial Cables ...............................
4-10
15. Setting B —SAVE A Reference
Replacing the Dual Diode Assembly
4-10
Level .......................................
3-71
Replacing the C rt............................
4-10
ii
REV JUN 1983

Tektronix 492 Specifications

General

Brand	Tektronix
Model	492
Category	Measuring Instruments
Language	English