2225
Service
1.
Locate the Circuit Board Illustration.
2.
Determine the Circuit Number and Schematic Diagram.
3.
Locate the Component on the Schematic Diagram.
a. Identify the Assembly Number of the circuit board that the component is
on by using the Circuit Board location illustration in this section or the
mechanical parts exploded views at the rear of this manual.
To identify any component mounted on
a circuit board and to locate that
compo-
b. In the manual, locate the tabbed foldout page that corresponds with the
nent in the schematic diagram.
Assembly Number of the circuit board. The circuit board assembly
num-
bers and names are printed on the back side of the tabs (facing the rear of
the manual).
a. Compare the circuit board with its illustration. Locate the component you
are looking for by area and shape on the illustration to determine its Circuit
h
Number.
a. Locate the tabbed page that corresponds to the Schematic Diagram
r
ber. Schematic diagram numbers and names are printed on the front
,
\
of the tabs (facing the front of the manual).
b. Scan the lookup table next to the Circuit Board illustration to find the
Circuit Number of the component.
b. Locate the Assembly Number in the Component Location lookup
1
next to the schematic diagram. Scan the CIRCUIT NUMBER colurr
that table to find the Circuit Number of the component you are lookin!
in the schematic.
c. Read the SCHEM NUMBER column next to the component's circuit num-
ber to find the Schematic Diagram number.
XY
PLOTTER BOARD DIAGRAM
22
AZO-XY PLOTTER BOARD
PULL-OUT
PAGE TABS
FOR
CIRCUIT BOARD
ILLUSTRATION
F~gurs
9-24
A20-XY
Plotter
board
SCHEMATIC
LOOKUP
TABLE
COMPONENT
LOCATION
TABLE
ILLUSTRATION FOR
INSTRUMENT
BOARD
LOCATION
NUMERAL AND LETTER AT SIGNAL LINES
TO OR FROM OTHER DIAGRAMS INDICATES
THE
GRID COORDINATES ON ANOTHER SCHEMATIC
(FOR EXAMPLE:
8J)
1.
Determine the Circuit Board Illustration and Component Location.
2.
Locate the Component on the Circuit Board.
a. From the schematic diagram, determine the Assembly Number of the
cir-
a. In the manual, locate the tabbed page that corresponds to Assembly Num-
c. From the small circuit board location illustration shown next to the circuit
cuit board that the component is on. The Assembly Number and Name is
ber the component is on. Assembly numbers and names for circuit boards board, find the circuit board's location in the instrument.
To identify any component in a
sche-
boxed and located in a corner of the heavy line marking the circuit board are on the back side of the tabs.
matic diagram and to locate that compo-
outline in the schematic diagram.
d. Find the circuit board in the instrument. Compare it with the circuit board
nent on its respective circuit board.
b Using the Circuit Number of the
component and its given grid location, find
illustration in the manual to locate the component on the circuit board
b. Find the Component Location table for the Assembly Number found on the
the component in the Circuit Board illustration. itself.
schematic. Scan the CIRCUIT NUMBER column to find the Circuit Num-
ber of the component.
c. Look in the BOARD LOCATION column next to the component number
and read its circuit board grid coordinates.
Figure
9-3.
Locating components on schematic diagrams and circuit board illustrations.
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