Maintenance
7–12
1502C MTDR Service Manual
1. Remove the Power Supply Module as shown in a previous procedure.
2. Remove the Front Panel Assembly as previously described.
3. Remove the ribbon cable on the Main Board that connects the Main Board to
the Option Port Assembly.
4. Remove the screw and washer from the instrument side panel.
5. Remove the nut from the bottom of the instrument.
6. The Option Port Assembly may be disassembled further by removing the four
screws from the back of the assembly. This will allow easy access for
replacement of the Option Port connector.
Troubleshooting
When encountering difficulties with the instrument, first use the troubleshooting
chart in the Operation chapter. This might eliminate any minor problems such as
fuse or power problems.
The following troubleshooting flow charts (next three pages) are designed to give
you an idea where to start. The Circuit Descriptions and Schematics chapters will
give further assistance toward solving the problem.
The Main Board waveforms represented on the flow chart are representative of an
instrument in operation per the setup at the top of the flow chart. Additional Main
Board waveforms are also included in this section.
The following Main Board waveforms are similar to the waveforms found on the
troubleshooting flow chart. In some cases, however, the oscilloscope was set to
show timing rather than the detail of the waveform. For example, TP7010 on the
flow chart shows the detail of the pulse, but the same test point in the following
figures shows the repetition rate.
Set the 1503C front-panel controls:
CABLE Attach 10-ft cable
NOISE FILTER 1 avg (3rd position CW)
VERT SCALE default
DIST/DIV 1 ft/div (4th position CW)
Vp .84
Vertical Position default
Horizontal Position default
(waveform figures located on page 7–16)
Removing the Option Port
Assembly
Troubleshooting Flow
Chart
Test Point Waveforms
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