Specifications

SQ: 1-13
RS3: Service Quick Reference Guide
Troubleshooting
Console Power-Up Tests (continued)
Item DefinitionTest
Console
(cont.)
ROM Test A test of the integrity of the boot ROMs on the
processor card that instruct the processor on
how to run the power up diagnostics. If a
failure is indicated here and the acknowledge
button will start up the console, the failure will
not affect the operation of the console once it is
running. The boot ROMs are only used during
start up. The online test of the ROM (MCT
Screen) may also indicate test failures.
SR Test SRAM test. If a fault is indicated here the card
should be replaced.
Watch Dog Timer The watch dog circuit is allowed to time out and
reset the microprocessor to verify its operation.
The card will operate i f the watch dog circuit is
not functioning. However, the card should be
replaced as soon as possible or, if a fault does
appear, the card may not reset in the case of a
bad instruction.
Keyboard All Lamps on for
Visual Check
All the LEDs on the Loop Callup Panel are
turned on to verify that they are all working.
Display Panel The panel is asked for the firmware revision
number. The response is checked for correct
format and checksum. The firmware level is
displayed on the screen. If there is no
response, the panel is assumed not installed.
Keyboard Interface Same as Display panel.
Option Panel Same as Display panel.
Trackball Same as Display panel.
TTY Keyboard This indicates that the null character was not
received from the keyboard microprocessor by
the console processor. A fault here could
indicate a bad TTY Keyboard, a disconnected
keyboard cable or a bad cable connection on
the console motherboard.
NOTE: If the cable between the motherboard
and the Loop Callup Panel is disconnected, the
console will show a fault yet would also load
the disk. The console screen then locks up
showing the date, time, and an alarm at the
bottom of the screen with no menu.
(continued on next page)