Tektronix WFM 601A, Service Manual

Page: 144 / 368

Maintenance
6–24
WFM 601A, WFM 601E, & WFM 601M Service Manual
NOTE . At times it may be necessary to change a calibration adjustment to
determine if a circuit is operational; however, because making this kind of
adjustment can destroy instrument calibration, you should exercise care. Before
changing an adjustment, note its position so you can return its original setting.
7. Determine the extent of the repair. If the necessary repair is complex, you
may want to contact your local Tektronix field office or representative before
continuing. If the repair is minor, such as replacing a component, see the
parts lists in sections 8 and 10 for replacement information. Procedures for
removing and replacing assemblies are described in this section.
NOTE
. Use a 2% RMA flux content solder when making repairs. Cleaning off
rosin residue is not recommended. Cleaning solvents may reactivate the rosin and
spread it under components where it can cause corrosion. The initial rosin
residue is not corrosive.
8. Refer to Table 6–9 on page 6–35 to determine the adjustments necessary
following the replacement or repair of any circuit board
The instrument electrical circuits consist of circuit boards connected by various
types of cables. All of the circuit boards are designated as assemblies. Each
assembly has an alphanumeric designation (A1 through A9). The assembles are
listed here and at the beginning of the Replaceable Electrical Parts list in this
manual.
Figure 6–21 shows the locations of all circuit board assemblies for the waveform
monitor. Table 6–2 lists the functional names and numbers of the circuit boards.
Circuit Board Locations