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Table 1-7.—Resistor Type Designation Part Number Breakdown | Up
Neets Module 19-The Technicians Handbook | Next
Figure 1-20.—Semiconductor diode markings and color code system |
1-54
Figure 1-19.—Color code for transformers.
Chassis Wiring Identification
The standard colors used in chassis wiring for the purpose of equipment circuit identification follow:
CIRCUIT
COLOR
GROUNDS, GROUNDED ELEMENTS, AND RETURNS
BLACK
BEATERS OR FILAMENTS, OFF GROUND
BROWN
POWER SUPPLY +Vcc/+Ebb
RED
SCREEN GRIDS
ORANGE
EMITTERS/CATHODES
YELLOW
BASES/CONTROL GRIDS
GREEN
COLLECTORS/PLATES
BLUE
POWER SUPPLY, -Vcc /-Ebb
VIOLET (PURPLE)
AC POWER LINES
GRAY
MISCELLANEOUS, ABOVE OR BELOW GROUND RETURNS,
AUTOMATIC VOLUME CONTROL (AVC)
WHITE
Semiconductor Case Outlines, Color Coding, Lead Identification, and Pin Placement
Case outlines, color coding, lead identification, and pin placements of common semiconductor
devices are used frequently by the technician and are included in figures 1-20, 1-21, and 1-22.
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