Tait T830 Series, Руководство по обслуживанию

Страница: 164 / 284

31/01/96 Copyright TEL
Grid Reference Index
To assist in locating components and labelled pads on the PCB layouts and circuit diagrams, a com-
ponent grid reference index has been provided. This index lists the components and pads in alpha-
betical order, along with the appropriate alphanumeric grid references, as shown below:
Using CAD Circuit Diagrams
Reading a CAD circuit diagram is similar to reading a road map, in that both have an alphanumeric
border. The circuit diagrams in this manual use letters to represent the horizontal axis, and num-
bers for the vertical axis. These circuit diagram “grid references” are useful in following a circuit
that is spread over two or more sheets.
When a line representing part of the circuitry is discontinued, a reference will be given at the end of
the line to indicate where the rest of the circuitry is located. The first digit refers to the sheet number
(printed on the bottom right hand corner of the CAD diagram) and the last two characters refer to
the location on that sheet of the continuation of the circuit (e.g. 1-D4).
If more than one line is represented (indicated by a double thickness line), a dot with a reference
label will follow the route each individual line represents.
circuit diagram
reference
PCB layout
reference
components listed
in numerical order
layer number -
1 = top side layer
2 = bottom side layer
component location
on the layer
sheet number
component location
on the sheet