Power Fail Circuit Functional Block Diagram - HP 3000 SERIES II System Service Manual

Computer system
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Maintenance Procedures
r ; : - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
MCl PCA
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fF
CAPcA - - - - ---- ----,
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CHECK 81TI
ERROR CODE
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GENERATOR
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DATA
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DRIVERS
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2
2
2
50
50
14
14
1,J3
FROM
AC POWER LOSS:
TIMING FOR PFW OF LONG
DURATION (PON DROPS OUT)
LINE TRANSIENT:
TIMING FOR PFW OF SHORT
DURATION (PON STAYS UP)
----,
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CIRCUITS
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rPOWERFAILCIRCUIT -
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- - - - - - - - - - - - - -
~-
-1
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PF WARNING
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EMITTER
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/
-
MSEC
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FOLLOWER
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O.S.
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MEMORY
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PROTECT FF
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EMITTER
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CIRCUITS
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TO
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THRESHOLD
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ELA
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DETECTOR
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+4.1V
CIRCUITS
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Pl
55
P1
5
P1
9
PF WARNING
MEM PROTECT
PON
MEM PROTECT
PF WARNING
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J
t----i
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PROTECT TIMING
~3.5
MSEC
rr
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- - - - -
RESTORE TIMING
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:1=
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--I~~
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0.6 SEC
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PROTECT TIM ING
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----------~Lt_r
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RESTORE TIMING
i . . . . . .
t - - - - - -
300 MSEC
r~
I------------~Jf___J
i'-------~f~
PON
7522-10
FROM
HP 30310A
POWER
SUPPLY
Figure 4-40. Power Fail Circuit Functional Block Diagram
4-73/4-74

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