HP 9800 SERIES - 9845 B;C Mainframe Preventive Maintenance

2-8 Theory of Operation
PI J,I
I I
-
I
I
45
37
39
15
43
13
25-31
33
II
35
21
19
9
41
a::
LoJ
...J
...J
0
a::
f--
z
0
u
0
0
u.
'---
RDATA
LOWCURR
WDATA
WRITDRV
HEADLOAD
WRPROT
HEADSEL
DRV0-3
MOVE IN
DISCHNG
STEP
READY
INDEX
TWO-SIDE
TRACK
0
I
READ
46 LOGIC
2
38 WRITE
LOGIC
40
POR r
r HEAD LOAD
16
44
14
26-32
34
CONTROL
12
LOGIC
36
22
20
10
42
I
READ/WRITE
HEADS
t
DOOR LOCK SOLENOID
ACTIVITY
LED
WRITE- PROTECT SENSOR
!JACKETSLOT}
HEAD- LOAD SOLENOID
TRACK
00 SENSOR {CARRIAGE TAB}
DOOR-CLOSED SWITCH ~
\
OA
OS
STEPPI N G MOTOR
OC
00
L INDEX SENSOR
{INDEX HOLE}
INDEX LED
Figure 2-2. Drive Block Diagram
WRITE PROTECT LED ~
TRACK 00 LED ~
I