HP 9030 User Manual

Theory of Operation 2-33
MEM DUMP Switch
The RESET switch must be pressed to halt all program operations before the MEM DUMP switch
is pressed. Then, when the MEM DUMP switch is pressed, the contents of main memory are
dumped onto the 1I4-inch tape cartridge. When this completes, program operations begin where
they left
off. Pressing MEM DUMP when a load has failed (LOAD LED still on) displays an error
number
on the 110 LEOs. The error number assists in fault diagnosis. Refer to Chapter 3 for details
on I/O LED error numbers.
SELF TEST Switch
When the SELF TEST switch is pressed, the computer initiates a continuous system self-test. In
contrast to the single-pass self-test which is executed each time the system powers up, the con-
tinuous self-test
is primarily for detecting intermittent failures. The SELF TEST switch is a latching
switch.
As long as the switch is down, the continuous self-test continues. When the switch is pressed
again, releasing
it, the continuous self-test is terminated at the end of this pass. The computer
cannot
be powered on when the SELF TEST switch is latched on.
The
SELF TEST LED indicates the status of self-test mode. The LED and its operation are
descibed
in following paragraphs.
Light Emitting Diodes (LEOs)
The following paragraphs define the 27 LEOs on the service panel. The first two LEOs defined
indicate normal operating conditions
and are green. The remaining LEOs are red and define
test-in-process or fault conditions. Whenever a self-test of the computer
is initiated, all service panel
LEOs light for about one second and then go off. This provides a quick check of LEOs.
POWER ON LED
This LED indicates that the + 5V supply is operating. It implies that the power supply assembly is
functional and that power is being provided to the system.
RUN LED
This LED indicates that the operating system has been loaded and is running. It is controlled by the
service microprocessor from a status message from the operating system.
SELF TEST LED
The SELF TEST LED is on whenever self-test is in progress. It is turned on by the service processor
at every powerup or when the
SELF TEST switch is pressed. It is turned off when a hard failure is
detected or when the self-test successfully completes. If a hard failure is detected, an indication of
the failure
is displayed on the service panel. The failure can only be cleared by a hard reset (cycle
power or press
SELF TEST). If no failures are detected, the operating system turns off the SELF
TEST
LED and turns on the RUN LED.
PROCESSOR 1-12 LEDs
These LEOs are controlled by the microprocessor and indicate which processor stack fin strate did
not pass self-test.
Only one finstrate LED can be on at a time except at powerup when all service
panel
LEOs are on briefly. The error must be cleared by a hard reset.

HP 9030 Specifications

General

Brand	HP
Model	9030
Category	Desktop
Language	English