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SECTION V
MAINTENANCE
5-1
INTRODUCTION
5-2
Upon receipt of the power supply, the per-
formance check (Paragraph 5-ll)should be made.
This check is suitable for incoming inspection. If
a fault is detected in the power supply while mak-
ing the performance check or during normal opera-
tion, proceed to the troubleshooting procedures
(Paragraph 5-51).
After trouble shooting and repair
(Paragraph 5-59), perform any necessary adjust-
ments and calibrations (Paragraph 5-61).
Before
returning the power supply to normal operation,
repeat the performance check to ensure that the
fault has been properly corrected and that no other
faults exist.
Before doing any maintenance
checks, turn-on power supply, allow a half-hour
warm-up, and read the general information regard-
ing measurement techniques (Paragraph 5-6).
5-3
HIGH VOLTAGE PRECAUTIONS
5-4
With the supply operating normally and
neither output grounded to the chassis, there are
many high voltage points within the chassis that
are dangerous to personnel.
The potentials vary
from several hundred to 3000 volts and are depend-
ent on the setting of the VOLTAGE thumbwheel
switches.
Therefore, always observe the follow-
ing caution:
CAUTION
Connect the positive output to ground
(chassis) before removing the covers
to perform maintenance.
This reduces
the number of internal points with
dangerous potentials.
5-1
5-5
With the positive terminal connected to
chassis, only the points illustrated in Figure 5-1
are at a high potential with respect to the chassis.
5-6
MEASUREMENT TECHNIQUES
5-7
All measurements given in this manual are
with a negative power supply output (positive ter-
minal grounded to chassis).
When measuring per-
formance of the power supply it is important that
the connection to the output terminal does not in-
troduce additional resistance.
For voltage meas-
urements, use a T-connector at the negative output
terminal and connect the load to one output of the
T-connector and the measuring device to the other
output of the T-connector.
For current measure-
ments, connect a four-terminal current monitoring
resistor in series with the load resistor and con-
nect both to one output of the T-connector.
Con-
nect the measuring device across the current mon-
iroring resistor.
5-8
When using an oscilloscope, ground the case
at the same ground point as the grounded terminal
of the power supply. Make certain that the case is
not also grounded by some other means (powercordl.
Connect both oscilloscope input leads to the power
supply ground and check that the oscilloscope is
not exhibiting a ripple or transient due to ground
loops, pick-up or other means.
5-9
TEST EQUIPMENT REQUIRED
5-10 Table 5-1 lists the test equipment required
to perform the various procedures described in
this section.
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Table of Contents
Troubleshooting
