1502C MTDR Service Manual
9–1
Diagrams
General Information
Each assembly in the instrument is assigned an assembly number (e.g., A1). The
assembly number appears in the title block of the schematic diagram, in the title for
the circuit board component location illustration, and in the lookup table for the
schematic diagram component locator. The replacable parts list is arranged by
assemblies in numerical sequence: the components are listed by component
number.
The schematic diagram and circuit board component location illistration have grids.
A lookup table with the grid coordinates is provided for to help you locate the
component.
The component locator lookup table provides an alphanumeric listing of all cirucit
numbers for the circuit boards in the instrument. Corresponding to each circuit
number is a schematic page reference, the locator for that schematic page, and the
locator for the circuit board.
The locator lists are given for each circuit board, ordered by that board’s assembly
number:
An example entry is as follows:
Schematic Schematic Board
Page Locator Locator
↓↓↓
C10306 2B D8 C1
Read: Capacitor C10306 is found on schematic 2B in grid D8. Its physical location
is grid C1 on the circuit board.
A locator list and circuit board grid are also given on each circuit board illustration.
Graphic symbols and class designation letters are based on ANSI standards.
Logic symbology reflects the actual part function, not the logic function performed.
Therefore, logic symbols should reflect manufacturer’s data.
Electrical components shown on the diagrams are in the following units:
Resitstors = Ohm (Ω)
Assembly Numbers
Grid Coordinates
Electrical Parts Locator
Schematic Symbols
Component Values
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