HP 740B Operating And Service Manual page 87

Model 740B
Section VII
SECTION VII
CIRCUIT DIAGRAMS
7-1. INTRODUCTION.
7 -2. This section contains the circuit diagram s nec-
essary for the operation and maintenance of the Model
740B. Included are block, functional, schematic, and
component location diagrams.
which do not lend themselves to a simplified pre-
sentation, such as relays and switches, are shown in
schematic form. Controls and adjustment points re-
1ated to maintenance are identified on this diagram.
7-7. SCHEMATIC DIAGRAMS.
7-3. BLOCK DIAGRAMS.
7-4. The block diagrams shows the relationshipbe-
tween the basic circuits in the Model 740B in the dif-
ferent modes of operation.
7-5. FUNCTIONAL DIAGRAM.
7-8. The circuits contained within individual replace-
able assemblies are shown in the schematic diagrams.
Circuits external to the assembly are shown to show
the complete function of the assembly. The schematic
diagrams are arranged in ascending order of reference
designation.
7-9. COMPONENT LOCATION DIAGRAMS.
7-6. The overall operation of the Model 740B is shown
on the functional diagram. Assemblies and signifi-
cant portions of assemblies such as amplifiers and
power supplies are not shown in schematic form, but
are shown as triangles and blocks. Circuit elements
7-10. Each component
in
the Model 740B is located by
reference designation. The component location dia-
grams adjacent to the schematic diagrams show the
physical location of each component.
GENERAL NOTES
GUARD - - - - - - - - - ' \ ELECTRICALLY
r
COMMON
POWER SUPPLY GROUND----J (ALL MODES)
W
CIRCUIT GROUND
~ELECTRICALLY
COMMON IN
W
REFERENCE SUPPLY COMMON STD MODE
W
W
14. VOLTAGES INDICATED IN RED ARE MEASURED WITH A HIGH IM-
pEDANcE FLOATING VOLTMETER. SEE CORRESPONDING SCHEMATIC
NOTES FOR VOLTAGE GROUND REFERENCE POINT. INDICATED
VOLTAGES ARE TYPICAL AND WILL VARY SLIGHTLY FROM INSTHU-
ME NT TO INSTRUMENT.
12.
*
DENOTES FACTORY SELECTED VALUE. SEE REPLACEMENT OF
FACTORY SELECTED COMPONENTS. SECTION V. FOR REPLACE-
MENT INSTRUCTIONS.
13. SYSTEM GROUNDS ARE AS FOLLOWS:
±-
CHASSIS GROUND
15. 'QDENOTESWAVESHAPE; SEEWAVESHAPE DRAWING. WAVE-
SHAPES SHOULD BE OBSERVED WITH A WIDE BANDWIDTH
FLOATING OSCILLOSCOPE. SEE CORRESPONDING SCHEMATIC
NOTES FOR WAVESHAPE GROUND REFERENCE POINT. WAVE-
SHAPES ARE TYPICAL AND WILL VARY SLIGHTLY FROM IN-
STRUMENT TO INSTRUMENT.
_ _ _ _ _ _ _ _ _ DENOTES MAIN SIGNAL PATH.
_ _ _ _ _ _ _ _ _ _ DENOTES DC FEEDBACK PATH.
4.
5.
3.
1. PARTIAL REFERENCE DESIGNATIONS ARE SHOWN. PREFIX WITH
ASSEMBLY OR SUBASSEMBLY DESIGNATION(S) OR BOTH FOR COM-
PLETE DESIGNATION.
2. COMPONENT VALUES ARE SHOWN AS FOLLOWS UNLESS OTHER-
WISE NOTED.
RESISTANCE IN OHMS
CAPACITANCE IN MICROFARADS
----DENOTES ASSEMBLY.
6. . . • • DENOTES AC FEEDBACK PATH.
7.
~
DENOTES FRONT PANEL MARKING.
8.
~
-=--=.
~
DENOTES REAR PANEL MARKING.
9.
~DENOTES
SCREWDRIVER ADJUST.
10. ODENOTES FRONT PANEL CONTROL.
11. ~ DENOTES WIRE COLOR: COLOR CODE SAME AS RESISTOR
COLOR CODE. FIRST NUMBER IDENTIFIES BASE COLOR.
SECOND NUMBER IDENTIFIES WIDER STRIP. TRIRD NUM-
BER IDENTIFIES NARROWER STRIP.
(e.g. 924
=
WRITE. RED. YELLOW.)
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