Removable-Media Mass Storage Problems - DEC 4000 AXP Service Manual

Table 2–7 Removable-Media Mass Storage Problems
Problem Symptom
Drive failure Fault LED for drive is on
(steady).
Duplicate bus Drives with duplicate bus node
node ID plugs ID plugs are missing from the
(or a missing configuration screen display.
plug)
A drive with no bus node ID plug
defaults to zero.
Bus node ID set Valid drives are missing from
to 7 (reserved the configuration screen display.
for host ID)
One drive may appear seven
times on the configuration screen
display.
SCSI continuity Power-up screen reports a
card missing failing storage adapter port;
console event log contains soft
error message reporting a SCSI
continuity card is missing; drives
on Bus E are not displayed on
configuration screen; possible
read/write errors.
Missing or loose Cable: storage device to ID
cables panel—Bus node ID defaults to
zero; online LED does not come
on.
Cable: Power—Drive does not
show up in configuration screen
display.
Terminator Read/write errors in console
missing event log; storage adapter port
may fail
Vterm module No termination voltage
failure measured at Bus E SCSI
connector (pin 38, ground pin
1); Read/write errors; storage
adapter port may fail; or
console erroneously reports
SCSI continuity card as missing.
Corrective Action
Replace drive.
Correct bus node ID plugs.
Correct bus node ID plugs.
Attach SCSI continuity card
(Section 6.1.5.2).
If console erroneously reports
SCSI continuity card as missing,
replace the Vterm module. The
Vterm module contains the logic
for reporting SCSI continuity card
errors.
Remove device and inspect cable
connections.
Attach terminator to connector
port.
Replace Vterm module (termina-
tion power source for removable-
media storage compartment).
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Power-On Diagnostics and System LEDs 2–25