Maintenance
Probe C omp O utput
When the oscill
oscope is on and operating properly, the Probe Comp output
should generate a square wave, approxim ately 5 V in amplitude, at a 1 kHz
frequency. Use the oscilloscope and use a 10X TPP0101 or TPP0201 probe to
probe this output.
As shown in the following table, there are two cases of defects . Either the 1 kHz
signal is on and the power supply and Main board are both active and functionally
capable of d
oing acquisition, or one of those two modules is not performing
correctly. While many different possible frequencies exist, all involve detected
failures on the Main board due to Main board failure or power supply failure.
Table 19: Probe Comp output
Signal at Probe Comp Possible p roblem
1 kHz signal, no d isplay
Refer to Troubleshooting the Display. (See page 76,
Troubleshooting the Display.)
Non-1 kHz signal
Refer to Troubleshooting the Main Board. (See page 80,
Troubleshooting the Main Board.)
No signal
Refer to Troubleshooting the Power Supply . (See page 75,
Troubleshooting the Power Supply.)
74 TDS2000C and TDS1000C-EDU Series Oscilloscope Service Manual
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