CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
6-65
Troubleshooting
WARNING. Before performing this or any other procedure in this manual, read
the General Safety Summary and Service Safety Summary found at the
beginning of this manual.
To prevent possible injury to service personnel or damage to electrical compo-
nents, please read Preventing ESD on page 6--1.
This section contains information and procedures designed to help you isolate
faults to a module.
This section assumes that service personnel have the prerequisite skills required
to work on this instrument, including PC troubleshooting and Windows
operating system skills. Details of PC and Windows operation and service are
not in this manual.
For assistance, contact your local Tektronix Service Center.
Service Level
This subsection contains information and procedures designed to help you isolate
faulty modules in the instrument. If a module needs to be replaced, follow the
Removal and Installation Procedures located in this section.
Check for Common Problems
Use Table 6--4 to quickly isolate possible failures. The table lists problems and
possible causes. The list is not exhaustive, but it may help you eliminate a
problem that is quick to fix, such as a blown fuse or loose cable.
Table 6- 4: Failure symptoms and possible causes
Symptom Possible cause(s)
Instrument will not power on H Power cord not pl ugged in
H Failed fuse
H Mains power switch is in off position
H Faulty power supply
Front panel light comes on
(instrument powers on), but
one or m ore fans will not
operate
H Faulty fan cable
H Defective fan assembly
H Faulty power supply
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