Appendix B: Solving Problems
B-3
LARC Diagnostic Programs
To enter the LARC diagnostic test mode, after the 480L
has powered up and resumed normal operation, press
PAGE and, while holding it down, press PROG. To
scroll through the menu, press PAGE; to load a dis-
played program, press PROG.
The following table shows how the diagnostic program
is organized, how it is loaded and how each of the
programs function.
To enter any diagnostic program, press PROG. To
exit, press PROG again.
EXIT Returns to normal operation
SLIDER Tests slider action through all posi-
tions; each slider should pass without
interruption through 256 positions (0
to 255)
BUTTON Tests button functionality; position of
last button pushed and last button
released is displayed
DISPLAY Lights all LED's ; pressing PAGE
steps through three displays
TAPEOUT Does not affect the 480L
DROPOUT Does not affect the 480L
SERIAL Inactive
VOLTAGE Displays LARC power supply voltage
- should be stable between 4.8 and
5.2 (048-052). Low voltage could indi
cate excessive cable power drop and
need for remote power pack
MAINFRAME Returns to normal operation
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