3.5-Inch Hard Disk Drive Troubleshooting - HP 3000 Series Handbook

For HP Internal Use Only
1. External SCSI terminator: If the configuration contains an external device, make sure that
the last device in the chain contains an ACTIVE terminator. The active terminator is
product number K2291 (part number: 1252-3920). The active terminator can be identified
by its construction material (chrome-color plastic). Do not use terminators made of black
or grey plastic, or chrome metal.
2. High density terminator: If there are no external devices, make sure that the high density
terminator is installed on the Multifunction I/0 card.
3. Cable length: Make sure that the total cable length does not exceed six meters. Count
both internal and external cable lengths. The internal cable length for 2-slot standard
chassis systems is 1.5 meters. The internal cable length for 6-slot and 12-slot expanded
chassis is 3.0 meters.
4. Old SCSI cables: Old SCSI cables are known to generate noise in the SCSI bus. Do not use
old SCSI cables. Old SCSI cables are grey color. New cables are parchment white.
5. Excessive termination: Ensure the ONLY device with termination SIP (Single In-line
Package) resistor packs installed is the device at the end of the internal bus. No other
internal or external devices should have termination resistor packs installed.
6. Internal cable damage: Ensure the internal SCSI ribbon cable has not been pinched by any
of the sheetmetal causing wires to be cut or the insulation to be scraped off.
7. Termination Power: Ensure the option pin-sets on each device are selected such that the
host supplies power to the termination resistors.
3.5-inch Hard Disk Drive Troubleshooting
Note
The following procedure does not apply to the A2444A, A2445A, and A2958A
3.5-inch drives. Each of these drives is replaced as a unit.
The hard disk drive includes two replaceable subassemblies: the disk mechanism and the SCSI
controller PCA. The firmware ROM on the SCSI controller PCA is also replaceable.
1. Turn off system power.
2. Remove the SCSI controller PCA from the disk mechanism.
3. Install a known good SCSI controller PCA on the disk mechanism. Make sure the
configuration jumpers on the good SCSI controller PCA assembly are set to the same
positions as the jumpers on the suspect assembly.
4. Remove the firmware ROM from the faulty SCSI controller PCA, and install it on the
replacement SCSI controller PCA.
5. Reinstall the disk drive.
6. Check to see if the problem is solved.
7. If the problem persists, change the ROM.
8. Check to see if the problem is solved.
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