Tektronix 492, 492P User manual

T j r i / SERVICE
1 Γ·Τν MANUAL VOLUME 2 - B
492 / 492P
SPECTRUM
ANALYZER
PORMBU / RACKMOUNT
Μ Η Ο Π Ο »
(SN MMOQO ft UP)
DIAGRAMS
&
CIRCUIT BOARD
ILLUSTRATIONS
Tektroni .
COMMITTED TO EXCELLENCE

DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS
Sym ols
Graphic sym ols and class designation letters are
ased on ANSI Standard Y32.2-1975.
Logic sym ology is ased on ANSI Y32.14-1973 in
terms of positive logic. Logic sym ols 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.
A reviations are ased on ANSI Y1.1-1972.
Other ANSI standards that are used in the preparation
of diagrams y Tektronix, Inc. are:
Y14.15, 1966 Drafting Practices.
Y14.2, 1973 Line Conventions and Lettering.
Y10.5, 1968 Letter Sym ols for Quantities Used in
Electrical Science and Electrical
Engineering.
American National Standard Institute
1430 Broadway
New York, New York 10018
Component Values
Electrical components shown on the diagrams are in
the following units unless noted otherwise:
Capacitors = Values one or greater are in picofarads (pF).
Values less than one are in microfarads
(A*F).
Resistors = Ohms (Ω).
T he in fo rm ation a n d sp e cia l sy m ols e low m ay a p p e a r in th is m a n u al.
Assem ly Num ers and Grid Coordinates
Each assem ly in the instrument is assigned an
assem ly num er (e.g., A20). The assem ly num er
appears on the circuit oard outline on the diagram, in the
title for the circuit oard component location illustration,
and in the lookup ta le for the schematic diagram and
corresponding component locator illustration. The
Replacea le Electrical Parts list is arranged y assem lies
in numerical sequence; the components are listed y
component num er ‘(see following illustration for
constructing a component num er).
The schematic diagram and circuit oard component
location illustration have grids. A lookup ta le with the
grid coordinates is provided for ease of locating the
component. Only the components illustrated on the facing
diagram are listed in the lookup ta le. When more than
one schematic diagram is used to illustrate the circuitry on
a circuit oard, the circuit oard illustration may only
appear opposite the first diagram on which it was il
lustrated; the lookup ta le will list the diagram num er of
other diagrams that the circuitry of the circuit oard
appears on.
COMPONENT NUMBER EXAMPLE
Component Number
A23 A2 R1234
! Schematic
• - * —» Orcwt
Subismmbty
Number (tf usetf)
Chassis mouted compoets have o Assembly Numt*
prefu— see e"3 of Replaceable Electrical Parts list
REFER TO
DIAG. 12
<12> ERROR
PLUG INDEX
(Pi 1 )
HARMONICA
CONNECTOR
P1018I , ------------------ T
IVJ f t00p U20+8 /
’,®SAIN — ■
/
R3082
2.5k
-------
i
lfc11 I
N
R 1037
2.7
+ 5 V — »
Q4
1/2025
4094 !
STRAP/RemovaOle for'
\ test purposes.
-ECB Outline
/ D
S '
R2031 Γ/ S i .
-FEEOTHRU PIN
-CROSSO ER PIN
P ll iC1031
/77 J.O^F
• *5 i ASSEMBLY CIRCUIT No.
ξA FUNCTIONAL NAME
EDGE CONNECTOR-^
(Board to Board-) P/OA5QA4 ERROR AMPLIFIER
STROBE ENABLE
P/O A50 A2
STROBE DRIVER *J4>
IC2203
I 160
TED—«v
r < y
P/O fK
PHASELOCK
CIRCUIT U'
<n>
\Tcio s 1
£ »■· /£
RIOZfe
180
-vw
R102S ^ R1028
130 < 120
-PRINTED ELEMENT
(Tra smissio Li e)
/-P/O (Part Of)
Γ FRONT PANEL
I AZZAZ, MICROSTRIP OSCILLATOR
PZZZ
4V \
\n male
n
- f ® it -
x»ox]
“ rtF M nrr
DENOTES A
PANEL CONTROL,
-MODULE WALL
DIAGRAM TITLE A NUMBER - -ERROR AM PLIFIER^

INDEX
Schematics —
Block Diagrams -
Assembly No. ►
Diagram Title
T
Functional
1st Converter
2nd Converter
3rd Converter
IF Section
Display Section
Frequency Control
Phase Lock System
Digital Control Section
Power Supply
RF Interconnect
RF Circuitry to 2nd Converter
2nd Converter and Phase Gate
829 MHz LO Section
829 MHz IF Section
110 MHz IF
3rd Converter
VR No 1
VR No 2
VR No 2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
<~· t\i n
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Log Amplifier and Detector 21
Video Amplifier 22
Video Processor 23
Digital Storage (Horizontal) 24
Digital Storage (Vertical) 25
Deflection Amplifier 26
Z A is/RF Interface 27
High Voltage Supply 28
Crt Readout 29
Front Panel Brd 30
Processor 31
Memory Brd 32
Sweep 33
Blank (For future use) 34
Span Attenuator 35
1 st LO Driver (492) 36
Preselector Driver 37
Shaper & Bias iSN B030000 » UP) 38
Phaselocked 2nd LO (SN B040000 & up) 38A
Phaselocked 2nd LO (SN B040000 & up) 38B
Center Frequency Control 39
Phaselock Control 40
Error Amplifier and Synthesizer 41
Controlled Oscillator, Offset Mi er, and Strobe Driver 42
Main Power Supply (Primary Section) 43
Main Power Supply (Secondary Section) 44
Mother Board (Front) 45
Mother Board (Rear) 46
Accessories Interface 47
_ GPIB and GPIB Interface 48
Ώ Ώ Ζ Ώ
REV NOV 1983

Section 8 - 492/492P Service Vol. 2 (SIM B030000 & up)
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DIGITAL CONTROL SECTION POWER SUPPLY
INSTRUMENT BUS^
MIN RF ATTEN C
MICROCOMPUTER
SWITCHING POWER SUPPLY
AND
REGULATORS
(Z65Z-70) 37ft* ·Οι FUNCTIONAL BLOCK DIAGRAM <$>*»■

492/492 P(sn B030000 έ UP) -7t) 3794. -0 2.
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4-92. j49£P (s 6030000 i up)

(2852-72) 378+-03
REV DEC 1981 Ζηά CON ERTERS BLOCK DIAGRAM