Control Data Corporation BR8 SERIES Hardware Maintenance Manual page 22

,....
c
-READ DATA
(SEPARATED)
-
1
-flOCK READ
(SEPARATED)
LOGIC
-RFAI) DATA
- (COMPOSI TE)
READ;WRITE
-LOW (:tJRRENT
HEAD
-WRITE DATA
WRITE
f
AND
FAULT
-WRITE ENARI F LOGIC
±WRITE FAl II T
-WRI TE FAULT
RESET
-POR (POWER-UP) HEAD LOAD
-I)OOR UNLOCK T.u
UNIT 1,2,3, OR 4
DOOR UNLOCK SOLENOID
-WRI TE PROTECT
ACTIVITY LED
-UNIT SELECT TO
WRITE PROTECT SENSOR
t~6~~T)
WRITE PROTECT l E J
UNIT 1,2,3, OR 4
*
--
-DIRECTION OR
HEAD LOAD SOLENOID
-STEP IN
-STEP OR
TRACK '00' SWITCH OR SENSOR
--
-STEP OUT
CONTROL
-LOAD HEAD
LOGIC
READY FROM
DOOR CLOSED SWITCH
UNIT 1,2,3, OR 4
*
-
-INDEX
~A}
-TRACK '00'
C/JB
STEPPING
MOTOR
-SECTOR
¢C
10-.-
I I ND&X/SECTOR SENSOR
~ ND~~t:$OR}
IN DEX/SECTOR lEDj
*DAISY CHAIN MODELS ONLY
Figure 4-1. Functiona I Block DioQram
c-
4-2
77834769-U