Tektronix VITS 200 Instruction Manual page 237

The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram.
Assembly A1.
VITS 200
Schematic Diagram <4> Component Locator Chart
(Partial Assembly A1 also shown on schematic 1, 2, 3, and 5 thru 9).
Diag
Comp Diag Bd Comp Diag Bd Comp
No Loc Loc No Loc Loc No Loc
C135 A3 O4 R178 D1 M5 S7 D2
C136 E5 N1 R179A B5 P2 S8 C1
R179B B3 P2
J5 B2 P5 R179C C3 P2 U29 D3
J6 A1 P5 R179D G3 P2 U30 F4
R179E G5 P2 U31 A2
P5 B2 R179F G5 P2 U32 F3
P6 A1 R179G G5 P2 U33 H4
R179H E1 P2 U34 G4
R177 E1 N4 R179I A5 P2
Bd Comp Diag Bd
No Loc Loc
Loc
N5 U35 B3 N4
L4 U36 F1 M5
U37 F2 M5
N3 U38 G3 N5
O2 U80 F4 K4
O5
M4 Y39 A3 O5
M2
O2