Locating Components On Schematic Diagrams And Circuit Board Illustrations - Tektronix 2246 1Y Service Manual

2246 1Y and 2246 Mod A Service 1. Locate the Circuit Board Illustration.
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).
2230 Service
PULL-OUT
PAGE TABS
FOR
Figure 9-24, A20— XY Plotter board.
CIRCUIT BOARD
ILLUSTRATION
ASSEMBLY NUMBER
AND
COMPONENT NUMBER EXAMPLE
CIRCUIT BOARD
\
1. Determine the Circuit Board Illustration and Component Location.
a. From the schematic diagram, determine the Assembly Number of the cir­
cuit board that the component is on. The Assembly Number and Name is
0
To identify any component in a sche­ boxed and located in a corner of the heavy line marking the circuit board
matic diagram and to locate that compo­ outline in the schematic diagram.
nent on its respective circuit board.
b. Find the Component Location table for the Assembly Number found on the
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.
2. Determine the Circuit Number and Schematic Diagram.
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
Number.
b. Scan the lookup table next to the Circuit Board illustration to find the
Circuit Number of the component.
c. Read the SCHEM NUMBER column next to the component's circuit num­
ber to find the Schematic Diagram number.
A20— XY PLOTTER BOARD
C IR C U IT C IR C U IT SCHEM
number N U M BE R N U M BE R N U M BE R N L|M B E R NU M BER
22
CR1014
CR1016 013 22
22
003
22
iii
22
006 I *17
22
J9301
on
L1001 :
e
22
L 1002
LI 003 22
014
G 1011 22
015 iii;
01012 22
1002 mooi '001 22
1003 lb02 22
C fl R1006
cn R 1011
SCHEMATIC
LOOKUP
TABLE
ILLUSTRATION FOR
INSTRUMENT
BOARD
LOCATION
2. Locate the Component on the Circuit Board.
In the manual, locate the tabbed page that corresponds to Assembly Num­
ber the component is on. Assembly numbers and names for circuit boards
are on the back side of the tabs.
Using the Circuit Number of the component and its given grid location, find
the component in the Circuit Board illustration.
Figure 9-3. Locating components on schematic diagrams and circuit board illustrations.
3. Locate the Component on the Schematic Diagram.
a. Locate the tabbed page that corresponds to the Schematic Diagram num­
ber. Schematic diagram numbers and names are printed on the front side
of the tabs (facing the front of the manual).
b. Locate the Assembly Number in the Component Location lookup table
next to the schematic diagram. Scan the CIRCUIT NUMBER column of
that table to find the Circuit Number of the component you are looking for
in the schematic.
XY PLOTTER BOARD DIAGRAM 22
COMPONENT
LOCATION
TABLE
NUMERAL AND LETTER AT SIGNAL LINES
TO OR FROM OTHER DIAGRAMS INDICATES
THE GRID COORDINATES ON ANOTHER SCHEMATIC
(FOR EXAMPLE: 8J)
c. From the small circuit board location illustration shown next to the circuit
board, find the circuit board's location in the instrument.
d. Find the circuit board in the instrument. Compare it with the circuit board
illustration in the manual to locate the component on the circuit board
itself.