Maintenance

Refer to the Replaceable Electrical Parts list for a complete description of each component.

NOTE. Check the Change Information section at the rear of the manual for corrections and modifications to the instrument and the manual.

Look up Charts. Each schematic diagram is assigned an alphanumeric grid and a look up chart which lists the grid location of components on that schematic.

Circuit Board Illustrations. Electrical components, connectors, and test points are identified on circuit board illustrations, which are located on the back of a preceding schematic diagram.

Assembly and Circuit Numbering. The circuit board assemblies are assigned assembly or “A” numbers. Figure 6-6 shows the circuit board assembly locations for this instrument.

A4 18V SUPPLY BOARD

A1 POWER SUPPLY BOARD

A6 TUNER

A5 70MHZ TUNER

A3 MAIN BOARD

A2 FRONT PANEL BOARD

Figure 6-6: Circuit board assembly locations

Parts Lists There are two separate parts lists in this manual. The Replaceable Electrical Parts list precedes the schematic diagrams and circuit board illustrations. The Replaceable Mechanical Parts list, accompanied by exploded view drawings, follows the schematic diagrams and circuit board illustrations.

Replaceable Electrical Parts. This list is arranged by assembly as designated in ANSI Standard Y32.16-1975. The list begins with the part numbers for the major assemblies (etched circuit boards). Each circuit board is identified by an A# (assembly number).

1705A Spectrum Monitor

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Tektronix 1705A instruction manual Circuit board assembly locations