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1780R-Series Service Manual
2–27
Operating Information
In order to effectively service the 1780R-Series it is essential to understand how
the controls work. Controls and switches fall into one of four groups; Display
(Scale, Focus, Intensity and Positioning), Special Purpose (Preset, Measure,
Configure, and Calibrate), Precision Measurement (Cursors, Phase, Line Select,
etc., which support the assignable measurement control), and the Functional
Measurement controls and switches (Input and Reference switching, etc., from
the right front panel). See Figure 2–17.
Figure 2–17: Simplified representation of the 1780R Series showing the location of
the control groups
When servicing this instrument, all of the front-panel controls will be used at one
time or another. In most cases the function of a control is obvious from the
front-panel nomenclature; however, there are cases where some extra explanation
is required. For example, the display controls (FOCUS, SCALE, INTENSITY,
VERT POS, HORIZ POS), located beneath the CRTs, are functionally switched
between the CRTs.
Figures 2–18 and 2–19 are used in conjunction with the following explanations
of the control functions.