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TM 11-6625-2958-14&P
SECTION V
MAINTENANCE
5-1 INTRODUCTION
5-2 Upon receipt of the power supply, the per-
formance check (Paragraph 5-5) 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 troubleshooting and repair
returning the power supply to normal operation, re-
peat the performance check to ensure that the fault
has been properly corrected and that no other faults
exist. Before performing any maintenance checks,
turn on the power supply and allow a half-hour
warm-up.
5-3 TEST EQUIPMENT REQUIRED
5-4 Table 5-1 lists the test equipment required to
(Paragraph 5-71), perform any necessary adjust-
perform the various procedures described in this
ments and calibrations (Pare graph 5-73). Before section.
Table 5-1. Test Equipment Required
TYPE
REQUIRED
USE
RECOMMENDED
CHARACTERISTICS
MODEL
Differential
I
Sensitivity: 1mV full scale (min.)
Voltmeter
Input impedance: 10M
Ω (rein.)
Oscilloscope Sensitivity and bandwidth;
100µV/cm and 400KHz for all
measurements except noise spike;
5mV sensitivity and 20 MHz band-
width for noise spike measure-
ment.
Measure dc voltages;
calibration procedures.
Measure ripple; display
transient recovery wave-
form; measure noise
spikes.
3420A/B (See
Note on Page 5-2)
140A with 1423A
time base and
1400A vertical
plug-in; 1402A
plug-in for spike
measurement.
Variable
Voltage
Transformer
Range: 207-253Vac. Recommend-
ed minimum output current: 12A,
6259B; 22A, 6261B and 6268B;
24A, 6260B: 36A, 6269B.
Vary ac input for line
regulation measurement.
----
AC Voltmeter
Sensitivity: 1mV full scale de-
Measure ac voltages and
403B
flection (min). Accuracy: 2%. ripple.
DC Voltmeter
I
Sensitivity: 1mV full scale de- Measure dc voltages.
I
412A
flection (rein). Accuracy: 1%.
Repetitive
I
Switching rate: 60-400Hz
I
Measure transient re- See Figure 5-5.
Load Stitch Rise time: 2µsec.
covery time.
Resistive
I
Values: see Figures 5-2 and 5-5.
Power supply load
----
Loads
resistors.
Current
Sampling
Resistors
Values: see Figure 5-8. Measure output current;
calibrate ammeter.
A4R123;
:
A4R123A-
A4R123B,
6260B only; see
Replaceable Parts
I
I
Table.
5-1