Agilent Technologies 1670G Series Service Manual page 153

Check for the following voltages and signals at J12 on the CPU board using an
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oscilloscope.
Disk Drive Voltages
Pin No. Signal
1 RESET
3 - 18 DATA
20 KEY
21 DMARQ
23 DIOW
25 DIOR
Pins 2, 19, 22, 24, 26, 30, 40, 43 are GROUND
Select Stop, and turn off the logic analyzer. Remove the power cable.
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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.
Disconnect the disk drive cables. Re-install the hard disk drive onto the disk drive
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assembly, and then re-install the disk drive assembly in the logic analyzer.
Reconnect the disk drive cables and install the cover on the logic analyzer.
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Connect the hard disk drive cable to the data pins as shown in the illustration. Do not connect
the cable to the address pins.
Voltage Pin No.
27
28
29
31
32
33
Signal Voltage
IORDY
CSEL
DMACK
INTRQ
IOCS16
DA01
Troubleshooting
To test the hard disk drive voltages
Pin No. Signal
34 PDIAG
35 DA00
36 DA02
37 CS0
38 CS1
39 DASP
41 +5V Logic
42 +5V Motor
44 (Resv)
Voltage
PWR
PWR
5–27