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Model 5065A
Circuit Diagrams, Theory, and Maintenance
SECTION V
MAINTENANCE
5-1. INTRODUCTION
5-2.
This section provides maintenance and service
information
for the
instrument.
This
section
is
organized as follows:
Paragraph No.
5-7
5-8
5-19
Section
Periodic Maintenance
Instrument Troubleshooting
Loop Alignment Procedure
5-3. In addition to the above sections, Table 5-1 lists
module designations, Table 5-2 gives in-cabinet per
formance check to check instrument specifications,
Table 5-3 gives front panel meter checks, Table 5-4
lists signal checks, and Table 5-5 gives recommended
test equipment for performance checks maintenance,
and troubleshooting.
Table 5-1. Assembly Designations
Assy
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
Name
Synthesizer
Battery Charger (Opt. 002, 003)
Multiplier
100 kHz Frequency Divider
Digital Divider (Opt. 001, 003)
1 MHz Frequency Divider
AC Amplifier
Phase Detector
Integrator
Oscillator
RVFR Temperature Controller
RVFR
Buffer Amplifier
Logic
Power Supply and Regulator
Power Supply, Digital Divider
(Option 001, 003)
Terminal Board
Jumper Board
Clock Display
HP Part No.
05065-6076
05065-6022
05065-6078
05065-6070
05065-6084
05065-6016
05065-6080
05065-6013
05065-6015
00105-6034
05065-6024
05065-6001
05065-6020
05065-6012
05065-6023
05065-6085
05065-6014
05065-6057
05065-60125
(Opt. 001)
and
05065-60136
(Opt. 003)
5-4. For individual module or circuit board mainten
ance, see the appropriate schematic foldout page.
The individual foldouts include theory, normal oper
ation, operational checks, troubleshooting (including
waveforms and/or voltages), and required circuit align
ment after repair or replacement.
5-5. INSTRUMENT ACCESS
5-6. For access to the modules or circuit boards in the
instrument, remove top and bottom covers.
Remove
four screws from the cover and slide it towards the rear.
To replace cover, reverse procedure.
5-7. PERIODIC MAINTENANCE
a.
Monitor all CIRCUIT CHECK meter readings
and check these readings against those listed on the
front panel door.
b. When the quartz oscillator control voltage ex
ceeds
1
/
2
of its dynamic range, the INTEGRATOR LIMIT
light will come on; this does not indicate a trouble.
When this light comes on, proceed as follows:
1)
Set CIRCUIT CHECK switch to CONTROL.
2)
Observing the meter, adjust OSC. FREQ.
ADJ. COARSE control to zero meter.
c.
Over a period of time, the second harmonic
signal level as seen on the meter may decay somewhat
due to an aging process in the A12 RVFR Assembly.
When this second harmonic signal level reaches V2 of its
initial value, the instrument should be adjusted to reset
the second harmonic signal level. This adjustment is
performed as follows:
1)
Set front panel OSC. FREQ. ADJ. FINE con
trol to 250.
2) Set CIRCUIT CHECK meter to CONTROL.
Observing the meter indication, adjust OSC.
FREQ. ADJ. COARSE control for a zero
reading.
3)
Set FUNCTION switch to LOOP OPEN.
4) Set OSC. FREQ. ADJ. FINE control to 200.
5)
Remove instrument top cover. Connect the
vertical input of an oscilloscope to A8TP3
and the horizontal input to A8TP2. Use the
oscilloscope horizontal amplifier instead of
the triggered internal sweep.
5-1
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