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6 Check for the following voltages and signals using an oscilloscope.
Disk Drive Voltages
Pin Signal Description Pin Signal Description
1 NC 2 Disk Change
3 NC 4 High Density
5NC6NC
7 +5 V 8 Index
9 +5 V 10 Drive Select
11 +5 V 12 NC
13 Ground 14 NC
15 Ground 16 Motor On
17 Ground 18 Direction
19 Ground 20 Step
21 Ground 22 Write Data
23 Ground 24 Write Gate
25 Ground 26 Track 00
27 Ground 28 Write Protect
29 Ground 30 Read Data
31 Ground 32 Side Select
33 Ground 34 Ready
7 Select Stop, and turn off the logic analyzer. Remove the power cable.
8 Disconnect the disk drive cable and re-install the disk drive in the logic analyzer.
9 Reconnect the disk drive cable and install the cover on the logic analyzer.
Troubleshooting
To test the disk drive voltages
5–26