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Maintenance
Troubleshooting the Main
Board
To troubleshoot the Main board (acquisition module), follow these steps:
1.
Remove the rear case. (See page 58,
2.
Use the test oscilloscope to measure the voltages from the power supply
module at J101 on the Main board module. The following table lists the
voltages you should expect to see.
Table 25: Troubleshooting the Main board
Supply
Voltage range
1
Maximum
current draw
J101 power
pins
J101 return
pins
Derived
supplies
35 V
30 V
DC
to 40 V
DC
fl
oating. Pin 2 connected
to +3.3 V on the Main board.
15 mA
1
2
+28 V LCD
+6 V
5.5 V to 6.5 V
1.0 A
4
3, 5, 8, 10
+5 V
+3.3 V
3.0 V to 3.6 V. Requires minimum load to
maintain regulation.
1.8 A
6, 7
3, 5, 8, 10
3.3 V, +2.5 V
-4 V
-5.0 V to -3.5 V
0.8 A
9
3, 5, 8, 10
-2.5 V
Line
trigger
-2 V to 6 V open circuit.
±1 diode drop when attached to the Main
board.
1 mA
11
3, 5, 8, 10
Line trigger
1
With 3 W minimum load; still functions with no load.
3.
If all of the voltages are present, the Main board is probably defective.
Replace it.
Running Diagnostics
The oscilloscope runs an extensive self-diagnostic routine at every power-on.
Running the diagnostics from the Service menu will provide no additional
information and therefore is not needed. The menu selections are only used during
manufacturing of the oscilloscope.
Troubleshooting Input
Connections
Follow these steps to troubleshoot the input connections only if the oscilloscope
appears to function normally in every way, but an input signal is not getting into
the oscilloscope as expected.
80
TDS2000C and TDS1000C-EDU Series Oscilloscope Service Manual
Summary of Contents for TDS1001C-EDU
Page 12: ...Preface x TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...
Page 30: ...Specifications 18 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...
Page 52: ...Performance Verification 40 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...
Page 60: ...Adjustment Procedures 48 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...
Page 85: ...Maintenance TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 73...
Page 96: ...Maintenance 84 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...
Page 110: ...Replaceable Parts 98 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...