Maintenance
WFM 601A, WFM 601E, & WFM 601M Service Manual
6–23
Troubleshooting
This section describes the how to troubleshoot the waveform monitor. Following
a general discussion of techniques, specific procedures are given for replacing
the fuse, troubleshooting the Power Supply and configuring the Component and
DAC boards for troubleshooting.
The following procedure is designed to help you isolate problems, which
expedites repairs and minimizes down time.
1. Determine if the malfunction exists in the waveform monitor or in another
system component. Make sure that the waveform monitor is being correctly
operated as intended by Tektronix (see Operating Instructions). Check that an
instrument upstream from the waveform monitor is not malfunctioning.
2. Determine and evaluate all trouble symptoms. Isolate the problem to a
functional block, assembly, or circuit board. Use the Theory of Operation in
section 3 and the block diagrams in section 9 for tracing signals and isolating
circuits.
CAUTION.
To avoid damaging components, use care when probing with meter
leads or probes. Misplacing leads or a probe could cause a short circuit or
transient voltage capable of destroying components.
3. Determine the nature of the problem. Try to determine whether the waveform
monitor is out of calibration or if there has been a component failure. Once
the type of failure has been determined, identify the functional area most
likely at fault.
4. Inspect the suspect assembly for physical defects. Most commonly these will
be components that are broken or loose, improperly seated, or overheated or
burned. Chafed insulation is also a common physical defect. Refer to the
Power Supply troubleshooting procedure on page 6–26. Repair or replace
obvious defects. In the case of overheated components, determine the cause
of overheating and correct the cause before re-applying power.
5. Use successive electrical checks to locate the source of the problem. The best
tool for isolating problems is the oscilloscope. Use the Performance
Verification procedure to check if a circuit is operating within specifications.
6. If the waveform monitor is operating, you should attempt to save the
calibration information into an NVDATA.TXT file using the Upgrade
program described on page 6–42. This is especially if you may need to repair
the Main board. Saving this information means you can simply load this
NVDATA.TXT file into Main board and avoid running the entire Adjustment
Procedure. If you exchange the Main board for another, you must run the full
Adjustment Procedure described on page 5–1.
General Troubleshooting
Techniques
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