Run Time Mode; Diagnostic Mode - HP 7936 Support Manual

CHANNEL ADDRESS switch segments S2, S3, and
S4 permit the selection of one of eight unique
channel addresses. The address settings, 0 through
7, are shown on the Channel Address/Diagnostic
Switch label on the rear panel. See figure 3-2.
Switches S2, S3, and S4 can also be used to initiate
diagnostic tests. (This function is not implemented
in the drive at this time.)
DIAGNOSTIC SWITCH segment Sl selects which
internal diagnostic routine the drive will execute at
power-on. The two diagnostic modes are described
in the following paragraphs.
3-8. RUN TIME MODE. When switch Sl is set
to the RUN TIME MODE position, a series of
hardware tests are performed at power-on.
Following successful completion of the hardware
diagnostic routines, the drive comes on line. The
diagnostic normally takes approximately 10
seconds to complete.
Successful completion of the diagnostic is indi-
cated by the Green LED remaining lit. If the drive
fails the hardware diagnostic, the Red LED will
remain lit and the Yellow and Green LEDs will be
coded to indicate the malfunctioning assembly. A
power supply failure or loss of input power is in-
dicated by all LEDs extinguished. The coding for
the LEOs is shown on a label on the rear panel.
See figure 3-2..
NOTE
A drive fault condition (Red LED lit)
does not necessarily mean that the drive
controller is incapable of communica-
tion with the host. In most cases, details
of the fault condition (over and above
the information encoded by the LEDs),
can still be obtained by commands from
the host. Refer to Chapter 8 for details.
Installation And Configuration
7936 and 7937
3-9. DIAGNOSTIC MODE.
NOTE
The DIAGNOSTIC MODE position is
for service purposes and should not be
used during normal operation of the
drive.
If Sl is set to the DIAGNOSTIC MODE position,
the same hardware diagnostic executed in RUN
TIME MODE is invoked when power is applied.
However, the controller does not bring the drive
on line following the completion of the hardware
diagnostic routines. Instead, the drive performs a
full-volume RO ERT (7.5 minutes) followed by a
continuous loop of random RO ERTs.
When the drive successfully completes the
hardware diagnostics and begins the RO ERTs,
both the Yellow and Green LEOs will be il-
luminated. If any uncorrectable or marginal data
errors occur during the RO ERTs, the Green LED
is extinguished leaving only the Yellow LED lit.
A hardware diagnostic failure is indicated by the
Red LED remaining lit and the Yellow and Green
LEDs coded to indicate the source of the most
likely malfunctioning assembly. A power supply
failure or loss of input power is indicated by all
LEDs extinguished. The coding for the LEDs is
listed on a label on the rear panel. See figure 3-2.
When the DIAGNOSTIC MODE position is selec-
ted, the drive \;Vill not come on line (be capable of
communication with the host) until the Power
switch is turned off. switch SI returned to the
RUN TIME MODE position, and the drive
powered on again.
NOTE
Failure information gathered during this
time will be logged in the internal error
logs of the drive. Refer to Chapter 8 for
details on how to retrieve this data.
3-3