HP 7925D Service Manual page 233

7925
Appendix A
3 4
9 10
11 12 13 14 15 16 17
D
C
A
+5V
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SEE FAULT
DETECTION
SYSTEM DIAGRAM
(04)
PHASE 2
CURRENT LIMIT . 1 CL21
LATCH
1
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BOTH MOTOR
PHASES
INHIUITED
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VL-I' SHUNT
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7
REGULATOR
- I
}SEE FAULT II : : , -36 VOLT
I
1
'
M ) TCC. DETECTION BLEEDER
PHASE 1 ,;. .... > ----------------t-~/ SYSTEM RESISTOR
CURRENT LIMIT
,@0
I PH1+
I I
DIAGRAM
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I
LATCH
e
A
I
(A7)
I
1:
1
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1
v
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REGULATOR
S Q
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PH1+ PROTECTION I
V - /15 7 18 CIRCUIT
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NOTE 2
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SEE FAULT
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PSF NOTE 2
L
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IPH2+1
L-.-.+710~}~~ii~~ION
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.=
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A :
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DIAGRAM (C3)
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PH2+
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1 1
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SCS2 J4 L---+-_----lf--4-_-I~--<....
.....
> -----e~----+----
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- / / I - +36 VO LT
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BLEEDER
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I :1
RESISTOR REGULATOR
I
PROTECTION
!, CL2 I CI RCUIT
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + 4 , /
.U
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1~ ~
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K ) VLlM+ ) 10 I _ 36 VS _ .......
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SPS
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SHUNT
1/
7 7 48 REGULATOR
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I
1/ (D2) +36VS
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ENCBI
e :
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NOTE: SHUNTS BETWEEN
I
I :
-------------------------~~~~
n ~,
'--------------------------~)_-_oc 1ft------------------------------~/
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OFF
III
ORANGE
t::\
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ENCODER
PULSE
GENERATOR
-'
t
SPS
(C7)
"1" = CW ROTATION
"0" = CCW ROTATION
~
REVERSE
DIRECTION
DETECTOR
II
a_
c
~--O
I
NOTES:
1. ALL D-TYPE FLIP-FLOPS ARE CLOCKED ON THE RISING EDGE OF THE CLOCK SIGNAL.
2. SPINDLE MOTOR GROUND (GROUNDS 3 AND 4).
3. REFER TO THE FOLLOWING FIGURES FOR DIAGRAMS OF REFERENCED SYSTEMS:
INTEGRATED CONTROLLER. . A-14
MAINFRAME ASSEMBLY . . . A-15
OPERATION CONTROL SYSTEM. A-16
HEAD POSITIONING SYSTEM. A-18
SECTOR SENSING SYSTEM. . A-19
READIWRITE SYSTEM . . . A-20
FAULT DETECTION SYSTEM. A-21
PHASE A
FF
,.....-
L - . - Q D1----+----4
...-- C
----
PHASE B
-LE...
- Q
D.....---+---~
( (
T
122kHzI
22 kHz ,
TRIANGLE WAVE ~
GENERATOR
~
COMPARATOR - - - " "
UNITY GAIN
DIFFEP~NTIAL ~
T
I
~~~~-----------~~~-~~~
INVERTING AMPLIFIER a...-- +
~~------.(')_------------------____.'---4---_I--I~,IOII
= ~ POSITIVE MOTOR
~t>=b>~----~V~------------------------------+-~~-------Pl.H~_A-_S-_E--I-IN-H-I-B
__
~ _ E _ D _ "
: _ _
t--...
ISMCIe-i)
A _ S C S +
/ ' (B13)
' - - - - - l I I l t .
" ' - SCS- '~(C13)
CURRENT SAMPLE
DIFFERENTIAL
AMPLIFIER
Iscci
rm
COMPARATOR
T
DIFFERENTIAL
. . ~
!
AMPLIFIER ___
CURRENT
K
COMMAND
~>-----
....... ---t+
V~-------n-----------------------,
LIMITER
a..--....,-----
V~----I-
~
Sll~
TL-.----4_
SPEED
DOWN
,.-.I~TCH
......-- D H
' ( i
SPS
- - - - 1 - - - - 1
C
(C10)
SPEED
DOWN
DETECTOR
( ---e I
ENCpl
-;- 4168
COUNTER
I
PHASE
I
T
SHIFT LEFT
0/11-------r~-
.......... BUFFER/FILTER
~
D:,.HE~~~R
01--------.
SHIFT RIGHT 11-------,
~
1 -
o _
i~
-
--
SPEED
UP
DETECTOR
+5V
2.25 MHz
OSCILLATOR
Ispul /
~~~EEN
.... ---- ....
PHASE
ENCODER"O"~"l"
PULSES
(540 Hz REFERENCE
@ 2700 RPM) CLOCK
540 Hz
/
"-I
"I
SEE FAULT { TOF
DETECTION
SYSTEM ILF
DlAG RAM ~---I------I
(B9)
M
~P.;:::.2:.....-
.....- - - - - - . f _ _ - - - - - - - _ _ 1 f _ _ - - - - - - - D - L - . - P I - P _ I
DL. PIP
11 (
RUN
I DOOR CLOSED
SWITCH-S7
NO)c NC
18 ~---_a_--<
J1
+12V
PIP
I
+5V
4~
I :
2 I
I
1
I
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STOP
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FCKDETECTciR
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I RUN
I
SEE HEAD SPINDLE FF
I
DL. PI"f> POSITIONING (C3) &
I
~--------+--+- __ f--f-+-----" FAU LT DETECTION (A 10)
SEE FAULT SYSTEM DIAGRAMS
I
I
DETECTION { RUN
I
DI~~~~~
R
0
t--
p2
r - t 1
)>-__
R_S_--« J
I
(D7)
I
I
<
S Q
RUN
I
16 f - - - + - - - - - ( " l I
I
!
R Q
t----..:S_TO~P_e-+-----__I
I I
STOP
<
9
~(------<
U.
POSITIO~EI~~~~~
{ _ .
I
J & SPU ~ ) SPU
<
L
SEE HEAD { FAULT DETECTION
~
7 C L
f
- -l - - -
POSITIONING (C3) & STOP (B10) I
I
CARRIA~E
BACK FAULT DETECTION SYSTEM DIAGRAMS
I
DETECTOR (B10)
I
I
J3
11~+5V I
SYSTEM DIAGRAMS
I
CRB P1
L__ J
I I
I
I }
SEE FAULT
I I
I PSF DETECTION
I
SYSTEM
DIAGRAM
_-------------a..~
15 )>--_S_P_D_--«
11~
/ ,,--L- +- --' I
(D5) I I
~~~ ~~Jl
I I I
SOLENOID
I
I
I
DSOL..... I J1 , 22 )>-_P_SF -« N STOP
I I
4
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45
1
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---~-- I I
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SPD
I
3
>
+10V
j
7
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L __
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L+1_0V
(~~~J
L --.J
DOOR LOCKED
SWITCH-S6
D
C
A
8 9 10 11 12 13 14 15 16 17
7311-98A
Figure A-17. HP 7925H Spindle Rotation System,
Functional Diagram
A-55/A-56