Tektronix 2440, User Manual

Page: 420 / 531

S ection 9- 24 40 S ervice
DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS
Sym bols
Graphic symbols and class designation letters are
based on ANSI Standard Y32.2-1975.
Logic symbology is based on ANSI Y32.14-1973 in
terms of positive logic. Logic symbols depict the logic
function performed and may differ from the manufac­
turer's data.
The overline on a signal name indicates that the signal
performs its intended function when it is in the low state.
Abbreviations are based on ANSI Y 1.1-1972.
Other ANSI standards that are used in the preparation
of diagrams by Tektronix, Inc. are:
Y14.15, 1966 Drafting Practices.
Y14.2, 1973 Line Conventions and Lettering.
Y10.5, 1968 Letter Symbols for Quantities Used in
E le c tric a l S c ie n c e and E le c tric a l
Engineering.
American National Standard Institute
1430 Broadway
New York, New York 10018
C o m p on en t Values
Electrical components shown on the diagrams are in
the following units unless noted otherwise:
Capacitors = Val ues one or greater are i n picofarads ( pF).
Values less than one are in microfarads
( a F).
Resistors = Ohms (Q).
The information and special symbols below may appear in this manual.
Assem bly N um bers and G rid C oordinates
Each assembly in the instrument is assigned an
assembly number (e.g., A20). The assembly number
appears on the circuit board outline on the diagram, in the
title for the circuit board component location illustration,
and in the lookup table for the schematic diagram and
corresponding component locator illustration. The
Replaceable Electrical Parts list is arranged by assemblies
in numerical sequence; the components are listed by
component number *(see following illustration for
constructing a component number).
The schematic diagram and circuit board component
location illustration have grids. A lookup table with the
grid coordinates is provided for ease of locating the
component. O nly the components illustrated on the facing
diagram are listed in the lookup table. W hen more than
one schematic diagram is used to illustrate the circuitry on
a circuit board, the circuit board illustration may only
appear opposite the first diagram on which it was il­
lustrated: the lookup table will list the diagram number of
other diagrams that the circuitry of the circuit board
appears on.
Function Block Title
Internal
Screwdriver
Adjustment
C a m Switch
Closure Chart
(Dot indicates
switch closure)
Etched Circuit Board
Outlined in Black
Refer to Waveform
Function Block
Outline
1C type
Test Voltage
Heat Sink
Board Name
P/O— Part ol
circuit board
Assembly Number
Tektronix Part No.
for circuit boards
A B C D
M o d i f i e d C o m p o n e n t
(Depicted in Grey, or With
G rey Outline) - S e e Parts List.
Strap or Link
Plug to E.C. Board
I B o x ) - Identifies Panel
controls, Connectors a n d
Indicators
Coaxial connectors:
m ale
female
Plug Index; signifies pin No. 1
External Screwdriver Adj.
Shielding
Selected value, see Parts List
and Maintenance Section for
Selection Criteria
Decoupled or Filtered
Voltage
Refer to Diagram Number
COLOR CODE
0 0 and Q - 1st, 2 n d , and 3 rd s ig n ific a n t fig u re s
0 —m u ltip lie r —to le ra n ce
C ER AM IC
CAPACITORS
—te m p e ra tu re c o e ffic ie n t
0
—p o la r ity an d v o lta g e ra tin g
0 a n d /o r ^ C ) c o lo r co d e m a y n o t be present
on som e c a p a cito rs
COLOR S IG N IF IC A N T
FIG URES
RESISTORS CAPACITORS DIPPED
T A N T A L U M
V O L TA G E
R A T IN G
M U L T IP L IE R T O LER A N C E M U L T IP L IE R TO LER A N C E
over 10 pF
under 10 pF
BLACK 0 1 — 1 ±20% ±2 pF 4 VD C
BROWN 1 10 ±1% 10
±1%
±0.1 pF 6 VD C
RED
2
102 or 100 +2%
102 or 100 ±2% — 10 VDC
ORANG E 3 103 or 1 K ±3% 103 or 1000 ±3% — 15 VDC
YE LLO W 4 104 or 10 K ±4%
104 or 10,000 + 1 0 0 % -9 % — 2 0 VDC
GREEN
5 105 or 100 K ±%% 10s or 100,000 ±5%
±0.5 pF
2 5 VDC
BLUE
6
106 or 1 M ±’/«% 106 or 1,000,000
— —
3 5 VDC
V IO L E T
7 — ±1/10% — — — 5 0 VDC
G R A Y
8 — — 10"2 or 0.01 +80% - 2 0 %
±0.25 pF
—
W H ITE 9 — — 10"1 or 0.1 ±10% ±1 pF 3 VDC
GOLD
—
1 0 " 1 or 0.1 ±5%
— — — —
SIL V E R
-
10~2 or 0.01 ±10%
— —
— —
NONE
- — ±20% — ±10%
±1 pF
—
( 1 8 6 1 - 2 0 A ) 2 6 6 2 - 4 8
T Y P IC A L D U A L
M E T A L C A S E
T R A N S IS T O R S
C B E
P L A S T IC
C A S E
T R A N S IS T O R S
CATHODE
D U A L
F E T S
11
- IN T E G R A T E D C IR C U IT S "
3 -T E R M IN A L
R E G U L A T O R S P O W E R F E T S
LEAD C O N F IG U R A TIO N S A N D CASE STYLES ARE T Y P IC A L , BUT M A Y V A R Y DUE TO VE N D O R CHANGES OR
IN S T R U M E N T M O D IFIC A T IO N S .
Schematic Name
and Number
Fig. 9-1. Color codes for resistors and capacitors. Fig. 9-2. Semiconductor lead configurations.