PCC D3400 - Page 99

,..- - -- - --,
I
I
RUNISTOP
I
RUNISTOP
I
I
CONTROL
COMMAND
I
I
'- _______ l
~
DETECTION
1/0
I
LOWER DETECTOR PULSE (LLDPG)
INTERLOCK
I
CONTROL
WRITE
OR ERASE (NLWOEG)
STARTISTOP DISK DRIVE (lSSDR
r-------,
I
CARTRIDGE
I
NUMBER ONE
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INSERTED
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NUMBER TWO
I
SWITCHES
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I
L ________ J
r--------,
I
BRUSHES
I
I
PARKED
I
SWITCH
I
I
I
POWER CLEAR (SPCSA)
L _______ ~
r--------
PART OF
r----'4I
HEADS RETRACTED (SHRXG)
SERVOPCBA
t -------- il POSITION TRANSOUCER
.r ------- -~ FAILURE (SPTFGl
EMERGENCY
PART OF
UNLOAD
READ/WRITE I
PCBA I WRITE EMERGENCY CONDITION (RWECG)
LOGIC
'r _________ J
ACTIVATE EMERGENCY UNLOAD (lAEUR)
I .
1'0
POSITION MODE (NLPMXG)
.
SPEED OUT OF TOLERANCIo (LSOTF)
POSITION
LIMIT ERROR (NLI'Lt:uJ
-
DISKSPEEO ERROR (NLDSEG)
SEEK TIME ERROR
(NLSTEG)
SELECTED (LSXXG)
CRYSTAL
OSCILLATOR
i
!
,
STARTISTOP CONTROL
,
,
CONDITION
INDICATION
:
;
DELAY COUNTER
CLOCK GATING
,
II
CLOCK COUNTDOWN
START DRIVE MOTOR
(NLSDMG)
-..
PURGE CYCLE (LPCFF)
~ PURGE CYCLE (NLPCFF)
--
LOAD HEADS (LLHFFI
LOAD HEADS (NLLHFFI
__ EMERGENCY UNLOAD (LEUFFI
~
LOAD OR PURGE NOT (NLLPNGI
__ BRAKE CYCLE ENABLE NLBCEGI
_ LOCK CARTRIDGE MECHANISM (LLCMGI
EMERGENCY UNLOAD ENABLE (LEUEG)
SAFE LAMP ORIVE (NLSLOTI
RUN
LAMP DRIVE (NLRXDTI
READY LAMP DRIVE (NLRLDTI
-
READY (LRXXG)
READY (NLRXXGI
SELECTED AND READY (LSARGI
SELECTED
ANti READY (NLSARGI
OELAYED
READY CONDITION (LDRCGI
-I
CLOCK SIGNALS
TO OTHER PORTIONS
OF LOGIC
MAJ OR FUNCTION
TROL SIGNALS CON
I
I
--+-'
I
-.,.J
I
--.J
PORTION OF
SERVOPCBA
L __ ~
r---i
-.
I
I
I
CONTROL
PANEL
LAMPS
1746
Figure 4-9. Start/Stop Control,
Functional
Block Diagram
4-39/4-40
830D