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HP 30310A Power Supply
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M1N
=
0.7MS
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L...J
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l....J
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--------~--~-~-------~-~~~{~-----~-:I~:---------------------------
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- ........ / :
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: :
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: :
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:
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PWR UP
I::
R
:
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:
TIMER RESET --.....:
:.----
ETRIGGER
, in
+06S' C
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PWR
UP
TIMER
~
0.6SEC
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INTERNAL SENSE LEVEL *
LL_-
D.C.
OUTPUTS
PFW
PON
LINE
VOLTAGE
*90% LEVEL
2208-45
Figure B-3. HP 30310A Functional Timing Diagram
goes low PFW and LPU go high. After a 4 ms delay, INU goes high and the preregulator and inverter
are enabled. The DC output voltages rise to their proper values and PSU goes high. After a delay of
0.6 second, PON goes high.
The overvoltage, undervoltage, line voltage, and DCE comparators are referenced to +4.22 volts.
The PON and PFW signals are supplied to the CPU. The TEMP SENSE signal is provided by a
thermistor
in
the CPU core. PON, PFW, and TEMP SENSE use common
W
as a return. PSU, LPU,
and DCE are provided for use with multiple power supplies. They use control common Was a
return. The +20 and -20 volt outputs use common
W
as a return, and the other DC outputs use
common
W.
All four commons are isolated from each other by resistors or an inductor. The DC
output voltages and the PON signal are brought out through isolation resistors to frop.t panel test
jacks for maintenance purposes.
B-15.
HP 30310A MAINTENANCE
Preventive maintenance is performed at scheduled intervals to prevent or mInImIze equipment
deterioration. Included in the preventive maintenance procedures are voltage tests which check
power supply operation.
Adjustments and test procedures are performed when required to isolate trouble and ensure normal
operation after a trouble has been corrected.
JAN 1977
B~15
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