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Troubleshooting
To test the flexible disk drive voltages
6 Check for the following voltages and signals using an oscilloscope.
Disk Drive Voltages
Pin
Signals
Pin No.
Signal
1
3
5
7
9
11
13
15
17
19
21
23
25
+5V
2
+5V
4
+5V
6
NC
8
HD OUT (HD at HIGH levell 10
NC
12
NC
14
OV
16
OV
18
OV
20
NC
~
OV
24
OV
26
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INDEX
DRIVE SELECT
DISK CHANGE
READY
MOTOR ON
DIRECTION SELECT
STEP
WRITE DATA
WRITE GATE
TRACK 00
WRITE PROTECT
READ DATA
SIDE ONE SELECT
7 Select Stop, and turn off the logic analyzer. Remove the power cable.
The test will not immediately stop when Stop is selected; it
will
continue until the current
iteration of the disk test is completed and then stop.
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.
5-29
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