Tektronix 1502C - Page 11

Contents
vi
1502C MTDR Service Manual
Figure 6–37: Rising Edge with Scale at 1.0 m r /div 6–22. . . . . . . . . . . . . . .
Figure 6–38: Rising Edge with Max Hold on 6–22. . . . . . . . . . . . . . . . . . . .
Figure 6–39: Head Alignment Chart Print 6–23. . . . . . . . . . . . . . . . . . . . . .
Figure 6–40: Circuit Board Locations in the Instrument 6–24. . . . . . . . . . .
Figure 6–41: Power Supply Board 6–26. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–42: Power Supply Test Points TP1020 and TP1010 6–26. . . . . .
Figure 6–43: Power Supply Test Point TP2030 6–27. . . . . . . . . . . . . . . . .
Figure 6–44: Connector Plug P5040 and Pins J5040 on Bottom of
Main Board 6–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–45: Power Supply Test Point TP1020 6–28. . . . . . . . . . . . . . . . .
Figure 6–46: Power Supply Test Point TP2030 6–29. . . . . . . . . . . . . . . . .
Figure 6–47: Location of Main Board in Instrument 6–29. . . . . . . . . . . . . .
Figure 6–48: Main Board Probe Points 6–30. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–49: Waveform on Display 6–30. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–50: Battery Connections to Power Supply Board 6–31. . . . . . . . .
Figure 6–51: CR2012 on Power Supply Board 6–32. . . . . . . . . . . . . . . . . .
Figure 6–52: Display Showing Power is Battery 6–32. . . . . . . . . . . . . . . . .
Figure 6–53: Display Showing Battery Voltage is Low 6–32. . . . . . . . . . . .
Figure 6–54: R2012 on Power Supply Board 6–33. . . . . . . . . . . . . . . . . . . .
Figure 6–55: Driver/Sampler Board Location 6–34. . . . . . . . . . . . . . . . . . .
Figure 6–56: TP1030 on Driver/Sampler Board 6–34. . . . . . . . . . . . . . . . .
Figure 6–57: R1018 on Front Panel Board 6–35. . . . . . . . . . . . . . . . . . . . . .
Figure 6–58: LCD Pattern with Contrast Too Light 6–35. . . . . . . . . . . . . . .
Figure 6–59: LCD Pattern with Contrast Too Dark 6–36. . . . . . . . . . . . . . .
Figure 6–60: LCD Pattern Adjusted for Sharpness 6–36. . . . . . . . . . . . . . .
Figure 6–61: Waveform with Contrast Too Light 6–37. . . . . . . . . . . . . . . . .
Figure 6–62: Waveform with Contrast Adjusted Correctly 6–37. . . . . . . . .
Figure 6–63: Driver/Sampler Board Location 6–38. . . . . . . . . . . . . . . . . . .
Figure 6–64: Incident Pulse at –2.000 ft 6–39. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–65: R1042 on Driver/Sampler Board 6–39. . . . . . . . . . . . . . . . . .
Figure 7–1: Location of Voltage Selector and Fuse Holder on
Rear Panel 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–2: Power Supply Module and P/O Rear Panel 7–4. . . . . . . . . .
Figure 7–3: Main Board 7–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–4: EPROM on Main Board 7–7. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–5: Lithium Battery on Main Board 7–8. . . . . . . . . . . . . . . . . . .
Figure 7–6: Display Module/Front Panel Board Screw Locations 7–10. . .
Figure 7–7: Display Module/Front Panel Board Showing Hex Nuts 7–10.
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