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Model 5065A
Circuit Diagrams, Theory, and Maintenance
|OPER| C
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OPEfi
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ICONTROLI
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Fig ure 5-6 . 5065ASi Tiplified Block Diagram
RF SECTION
AIO
QUARTZ OSC
A l
SYNTHESIZER
t
r
O/--
|FUNCTIOI
,
A3
MULTIPLIER
5MHz|
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ll
A9
INTEGRATOR
lERRORI
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137Hz
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A8
PHASE
DETECTOR
LOW FREQUENCY SECTION
N
AI2
RVFR
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-AMP
WEN
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A7
AC AMPLIFIER
A l l
OVEN
CONTROL
"1
>RVFR
/
SELL
OVEN
/
|2ND HARMONIC|
5-14. The FUNCTION switch allows the servo loop to
be opened for troubleshooting and instrument alignment.
Once the servo loop has been opened, troubleshooting
becomes fairly straightforward because the individual
circuits can be checked without feedback present.
5-15.
Fault Finding
5-16.
This section makes extensive use of Table 5-3,
CIRCUIT CHECKS, and Table 5-4, SIGNAL CHECKS to
provide a means of isolating the fault. For example, if a
fault is indicated by the erroneous meter reading, the
CIRCUIT CHECKS table provides the necessary tests
to further pinpoint the trouble.
Where pertinent, the
CIRCUIT CHECKS table refers to the SIGNAL CHECKS
table for further tests.
5-17. A fault is normally first seen when CONTINUOUS
OPERATION light goes off. The first step in finding the
trouble is to use the front-panel CIRCUIT CHECK meter.
Table 5-3, CIRCUIT CHECKS, provides normal indica
tion, as well as recommended procedure if a meter indica
tion is not correct. The use of this meter together with the
recommended procedures of the CIRCUIT CHECKS and
SIGNAL CHECKS tables provides a useful first step in
isolating a fault.
5-18. There is a small possibility that the 5065A may lose
its calibration and go off frequency without turning off
the CONTINUOUS OPERATION light. If this occurs:
1) check Synthesizer output frequency (see Section 3-10,
Frequency Offset Settings) and, 2) Check for proper oper
ation and setting of the MAGNETIC FIELD control.
5-7
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