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Maintenance
SPG 422 Service Manual (B034000 and above)
6–5
Corrective Maintenance
The following procedure is designed to assist in isolating problems, which in
turn expedites repairs and minimizes down time. There are no specific trouble-
shooting procedures for this instrument because it is a very simple instrument.
Ensure that the malfunction exists in the instrument. This is done by making sure
that the instrument is operating as intended by Tektronix (see Operating
Instructions), and by checking that a malfunction has not occurred before the
signal entered the SPG 422.
Determine and evaluate all trouble symptoms. This is accomplished by isolating
the problem to a general area, such as an assembly. The block diagram and the
Theory of Operation are valuable aids in signal tracing.
CAUTION.
Use extreme care when probing with meter leads or probes. The
components are very dense and there is only limited access within the instru-
ment. The inadvertent movement of leads or a probe could cause a short circuit
or transient voltages capable of destroying components.
Determine the nature of the problem. Attempt to make the determination of
whether the instrument is out of calibration or if there has been a component
failure. Once the type of failure has been determined, proceed on to identify the
functional area most likely at fault.
Visually inspect the suspect assembly for obvious defects. Most commonly these
will be broken or loose components, improperly seated components, overheated
or burned components, chafed insulation, etc. Repair or replace all obvious
defects. In the case of overheated components, determine the cause of overheat-
ing and correct the cause before re-applying power.
Use successive electrical checks to locate the source of the problem. The primary
tool for the problem isolation is the oscilloscope. Use the Performance Verifica-
tion procedure to determine if a circuit is operating within specifications. At
times, it may be necessary to change a calibrations adjustment to determine if a
circuit if operational, but since this can destroy instrument calibration, care
should be exercised. Before changing an adjustment, note its position so that it
can be returned to its original setting.
Determine the extent of the repair. If the necessary repair is complex, it may be
advisable to contact your local Tektronix field office or representative before
continuing. Removal and replacement procedures for the assemblies can be
found in this section.
General Troubleshooting
Procedures
Summary of Contents for SPG 422
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