MicroGuard
®
434/500 System — Troubleshooting Manual PN W453200 Rev C 08/01/00
GREER COMPANY 1918 E. Glenwood Place Santa Ana, CA 92705 Telephone: (714) 259-9702 FAX: (714) 259-7626
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Crane Systems
2.2 DISPLAY CONSOLE PROBLEMS
DISPLAY CONSOLE PROBLEMS are difficult to isolate because of the interaction between the
display console and the computer unit. Failure of either unit, or interconnection of the two units,
causes malfunction of display console indications. No "FAULT" diagnoses of other system
problems can be carried out without the proper function of the display console and it’s
communication with the computer unit.
To solve problems using display console indications, carefully observe the display console at
"power on" and through self-test. Next, use the following chart to help decide the course of action.
PROBLEM ACTION
There are no display console indications at all
when power is turned on. All displays remain
blank and no lights are illuminated.
Refer to SECTION 3.3.
The load, angle, radius, length, and rated
capacity display windows do not show
“
,
” or the bar graph display window has
missing black segments during the self-test.
Replace display console.
The red or yellow indicator lights do not
illuminate during self-test.
Replace display console.
The display console does not do the self-test.
No words or logical numbers ever appear
after power is turned on. The displays look
jumbled, with lots of missing segments.
Replace display console.
The display console lights are lit. Load, angle,
radius, length and rated capacity show “
,
”, but the graphics display remains blank
through and following the self-test.
Display console is OK.
Check connectors at rear of display console.
Refer to SECTION 3.4.
SECTION 2
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