Filter
Top Products
Table of Contents
1780R-Series Service Manual
vii
Figure 5–11: Adjustment locations on the Vectorscope circuit board
(Assembly A6) 5–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–12: Connections for adjusting the calibrator amplitude 5–22. . .
Figure 5–13: Input & BNC circuit board (A8) adjustments, shown as
they would appear with the instrument on its left side 5–25. . . . . . . . .
Figure 5–14: Test equipment connections for matching CH A and
CH B1 input gains. 5–26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–15: Test equipment connections for adjusting CH A
frequency response 5–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–16: Adjustment and test point (TP) locations for the
Oscillator circuit board (Assembly A7). 5–41. . . . . . . . . . . . . . . . . . . . .
Figure 5–17: Noise Reduction–ON. DAC offset properly adjusted 5–47. .
Figure 5–18: Noise Reduction–OFF. Demod offset properly adjusted 5–48
Figure 5–19: Z-Axis circuit board (A4) adjustment and test
point locations 5–51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–20: Vector graticule x- and y-axis markings for adjusting
xy input gains 5–53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–21: Properly adjusted xy input gains 5–54. . . . . . . . . . . . . . . . . . .
Figure 6–1: Front panel parts 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–2: Positions of the waveform CRT deflection leads 6–9. . . . . . .
Figure 6–3: Rear panel for the Tektronix 1780R-Series Video
Measurement Set showing the location of sub-assembly
mounting screws 6–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–4: Using foldout pages 6–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–5: 1780R-Series circuit board assembly locations 6–18. . . . . . . .
Figure 6–6: Connections for the external power supply leads 6–23. . . . . .
Figure 6–7: Connecting the AC mains to the 1780-R Series for
troubleshooting 6–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–8: A. Q250 collector waveform. B. Q250 base waveform.
C. Q350–Q451 emitter waveform. D. U460 pin 3 waveform.
E. U460 pin 4 waveform 6–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–9: +5 V supply output waveform when over voltage
protection is operating 6–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–10: Power supply load used when adjusting current limit
(A1R466). Load can be connected between the top end of
A2L638 and ground 6–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .