Maintenance
Probe Comp Output
When the oscill
oscope is on and operating properly, the Probe Comp output
should generate a square wave, approximately 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 o f 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 6-4: Probe Comp output
Signal at Probe Comp Possible problem
1 kHz signal, no display
Refer to Troubleshooting the Display. (See page 6-29,
Troubleshooting the Display.)
Non-1 kHz signal
Refer to Troubleshooting the Main Board. (See page 6-33,
Troubleshooting the Main Board.)
No signal
Refer to Troubleshooting the Power Supply. (See page 6-28,
Troubleshooting the Power Supply.)
TBS1000 Series Oscilloscope Service Manual 6–27
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