HP 3000 III Series Manual page 347

HP 32421A Series III Power Supplies
-6VB
+12.0VB
-3VB
+5VB
+12.7VB
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HP 30311A SEM\cONDUCTOR MEMORY POWER SUPPLY
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SERIES
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1
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REGULATOR
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BATTERY
SWITCHING
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VOLTAGE
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REGULATOR ~
REGULATOR
1
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-3V AND -5V
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SERIES
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REGULATORS
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BATTERY
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STATUS
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AND
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CONTROL
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CIRCUITS
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OVER/UNDER
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VOLTAGE
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DETECTORS
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PSU
LPU
t20V
• 16V
-20V
TEMP,
SENSE
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HJJ 30310A
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POWER
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SUPPLY
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SYSTEM D,C, CONTROL PANEL
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Figure 9-3. HP 30311A Power Supply Block Diagram
battery, and in the calibrate position allows setting of the bat-
tery float voltage level. Figure 9-1 illustrates the locations
of the controls and indicators on the power supply panels and on
the
Dc
Control Panel. Table 9-2 lists the function of each con-
trol and indicator. The BATTERY STATUS indicator is duplicated
on the power supply, on the Dc Control Panel, and on the top of
the cabinet door of the main bay. The power supply +5 indicator
is also duplicated on the
Dc
Control Panel as the SYSTEM DC POWER
indicator. (Complete specifications and detailed theory of opera-
tion for the power supply are contained in the HP 3000 Series
II/III Computer Systems Service Manual, part no. 30000-90018.)
9-13