Service Information; Introduction - HP 7957A Hardware Manual

Service Information
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4-1.
Introduction
WARNING
The disc drive does not contain operator serviceable parts. To prevent electrical
shock, refer all service activities to service-trained personnel.
CAUTION
• The field-replaceable assemblies (FRA's) in the disc drive are
electrostatic-sensitive devices. Take appropriate precautions when removing
the FRA's from the disc drive. Use of an anti-static pad and wrist strap is
required. (These components are contained in anti-static work station, part no.
9300-0749.) Immediately after removal, store the FRA's in anti-static,
conductive plastic bags.
• The disc drive is delicate and should be handled with care. Also, the disc drive
is heavier (l0.9 kilograms/24.0 pounds) than its size would indicate.
• Do not turn the LINE- switch off when the system is transferring data on the
Hewlett-Packard Interface Bus (HP-IB). This can be identified by a flashing
green front panel LED.
• Do not cycle the LINE- switch on and off unnecessarily.
• Do not connect or disconnect the HP-IB cable(s) from the disc drive when the
system is transferring data on the HP-IB.
NOTE
• For HP 7957 A and HP 7958A Disc Drives with a CEC Controller PCA-A2
date coded B-2633 and version MR1.1 firmware (07957-10151) with an
EEPROM installed, all error and fault logging is done to the EEPROM.
• For HP 7957 A and HP 7958A Disc Drives with a CEC Controller PCA-A2
date coded B-2633 and version MR1.2 firmware (07957-10161) installed, all
error and fault logging is placed on track 0 of the disc drive.
• For HP 7957 A and HP 7958A Disc Drives with a CEC Controller PCA-A2
date coded B-2707 or later, all error and fault logging is placed on track 0 of
the disc drive.
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