Tait T800 SL2 25W, Service Manual

Page: 290 / 383

D4.1.4 T803 PCB Information
M8SL2-00-002-812
© Copyright Tait Electronics Limited August 2004. All rights reserved.
Grid Reference Index
This section contains a component grid reference index to help you find components and labelled
pads on the PCB layouts and circuit diagrams. This index lists the components and pads in alpha-
numeric 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 numbers
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, as shown below. The first digit refers to
the sheet number and the last two characters refer to the location on that sheet of the continuation of
the circuit (e.g. 1R3).
circuit diagram
reference
PCB layout
reference
components listed
in alphanumeric order
layer number -
1 = top side layer
2 = bottom side layer
component location
on the layer
sheet number
component location
on the sheet
C301
4N7
R303
12
D S
G
L310
33U
IF-SIG
4R4
C369
100P
C371
10U
R339
100K
%R338
100
DISCRIMINATOR
1R3
2R9
2R9
8A2
these grid references
show where the circuit
is continued