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Troubleshooting
1780R-Series Service Manual
6–17
Assembly and Circuit Numbering. All circuit board assemblies are assigned
assembly or “A” numbers. Table 6–3 and Figure 6–5 show the assembly
numbers and their locations for this instrument.
NOTE. Always check the parts list for part numbers and descriptions when
ordering replacement parts. Some parts may have been replaced or have a
different value in an individual instrument.
Table 6–3: Circuit Board Assemblies
Assembly Number Board Name
A1 Low Voltage Power Supply and Waveform Monitor High Voltage Supply
A2 Waveform Monitor
A3 Vectorscope High Voltage Supply
A4 Z-Axis
A5 Microprocessor
A6 Vectorscope
A7 Oscillator
A8 Input including BNC
A9 Front Touch Panel
A10 Microprocessor Annex
A11 Interconnect
A12 Front Switch Panel
A13 Vectorscope Graticule Lights
A14 Waveform Monitor Graticule Lights
A15 Filter
A16 Waveform High Voltage Supply
A17 Fuse