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System Service
Table B-4. HP 30311A Power Supply Controls and Indicators
CONTROL OR INDICATOR
Power ON/OFF Toggle Switch
BATTERY TEST Momentary Toggle
Switch (mounted on rear of unit)
RESET Pushbutton Switch
+5 LED Indicator
CROWBAR/BATT TEST LED
Indicator
BATTERY STATUS LED
Indicator
FUNCTION
In the ON position, connects +20 volts from the HP
30310A Power Supply to the HP 30311A to maintain the
charge on the battery and to develop required memory
voltages.
In the OFF (down) position, disables the HP 30311A.
Places power supply in a battery discharge mode for test
purposes. (Simulates a power failure condition.)
Resets the battery discharge mode returning the power
supply to normal operation.
When lit, indicates that +5 volts is being produced by the
HP 30311A Power Supply.
Used in conjunction with the BATTERY STATUS indicator
to determine if the crowbar circuit has fired and shut down
the power supply.
I ndicates battery condition as follows:
a. Remains continually lit for a fully-charged battery.
b. Flashes at a 2-Hertz rate when the battery is discharging.
c. Flashes at a 0.5-Hertz rate when the battery is charging.
d. Remains off if battery is low or not present.
B-39.
HP 30311A MAINTENANCE
No high voltage points exist within this power supply. However, the supply is capable of supplying
low voltage at moderate current levels. Use caution when manipulating metal tools or probes near
exposed conductors and terminals. Extra care should be exercised to prevent the possibility of
shorting the output lines of the battery pack.
CAUTION
When cables are connected to or disconnected from the power
supply, the corresponding UPPER or LOWER 128K MEMORY
DC POWER switch on the System DC Control Panel must be
placed in STANDBY and the corresponding HP 30311A power
switch must be
in
the off (down) position to prevent equipment
damage.
B-40.
WIRING INFORMATION. Interconnecting wiring between the HP 30311A Power Supply
and other units of the system is presented in the Engineering Diagrams Manual. The information can
be used
as
an aid to troubleshooting procedures.
B-30
JAN 1977
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