Tektronix 2235A Instruction Manual page 163

2. Determine the Circuit Number and Schematic Diagram.
3. Locate the Component on the 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
L
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.
a. Locate the tabbed page that corresponds to the Schematic Diagram num- c. In the SCHEM LOCATION column next to the component, read the grid
ber. Schematic diagram numbers and names are printed on the front side
coordinates of the component in the schematic.
of the tabs (facing the front of the manual).
d. Using the grid coordinates given, find the component in the schematic
b. Locate the Assembly Number in the Component Location lookup table diagram.
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.
A20-XY PLOlTER BOARD
SCHEMATIC
LOOKUP
TABLE
XV PLOTTER BOARD DIAGRAM 22
COMPONENT
LOCATION
TABLE
2. Locate the Component on the Circuit Board.
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
ber the component is on. Assembly numbers and names for circuit boards board, find the circuit board's location in the instrument.
are on the back side of the tabs.
d. Find the circuit board in the instrument. Compare it with the 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
the component in the Circuit Board illustration. itself.
Figure 9-3. Locating components on schematic diagrams and circuit board illustrations.