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[10] CONNECTOR
PIN DEFINITIONS
TROUBLESHOOTING
AND DIAGNOSTICS
(HP 9153/54A S/N Prefix
2702A and Higher as well
as HP 9153/54B)
3 1/2-inch Winchester Disc Drive
Pin
#
Function
1
Read
Data
2
Ground
3
Write
Data
4
Ground
5
Write
Gate
6
Ground
7
4 MHz
Clock
8
Ground
9
Read
A/D
Converter
10
Ground
11
+5V
12
Ground
13
+5V
14
Ground
15
+12V
for Motor
16
Ground
for Motor
17
+12V
for Motor
18
Ground
for Motor
19
Drive
Select
0
20
Drive
Select
|
21
Drive
Select
2
22
Drive
Select
3
23
Write
D/A Converter
24
NA/B
25
Sector
Pulse
26
Index
Pulse
27
Write
NIC chip
28
Reset
29
+12V
for Motor
30
+12V
for Motor
31
Fault
32
+12V
33
Data
Bus
7
34
Data
Bus
0
35
Data
Bus
6
36
Data
Bus
1
37
Data
Bus
5
38
Data
Bus
2
39
Data
Bus
4
40
Data
Bus
3
3 1/2-inch Flexible Disc Drive
Disk
Change
Reset
Disk
Change
Indicator
+5V
In Use
+5V
Drive
Select
3
+5V
Index
Pulse
+5V
Drive
Select
0
+5V
Drive
Select
1
Ground
Drive
Select
2
Ground
Motor
On
Ground
Direction
Select
Ground
Step
Ground
Write
Data
Ground
Write
Gate
Ground
Track
0 Indicator
Ground
Write
Protect
Indicator
+12V
Read
Data
+12V
Head
Select
+12V
Ready
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