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Theory of Operation
3–4
1780R-Series Service Manual
Table 3–1: Schematics and Circuit Board Assemblies (Cont.)
Diagram
Number
Assembly
Number
Assembly NameSchematic Name
32 Digital Shifter Oscillator A7
33 Horiz AFC & Post Regulators Oscillator A7
34 Diff Gain/Phase Alt Mode Switch Oscillator A7
35 Digital Recursive Filter Filter A15
36 Z-Axis Z-Axis A4
37 Timing Cursors Z-Axis A4
38 Timing Cursor Counters Z-Axis A4
39 CRT Display DAC Z-Axis A4
40 Scale Illumination & Trace Rotation Z-Axis A4
41 Vector High Volts Vector High Volts A3
42 Waveform High Volts WFM Hi Volts A16
43 Low Voltage Power Supply Low Volts A1
44 Vectorscope, Waveform, & Oscillator Interconnect A11
45 Z-Axis, Graticules, Vector HV, &
Power Supply
Interconnect, Waveform,
& Vector Grat Lights
A11
A13
A14
46 MPU, & Front Panel Controls Interconnect A11