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CAU SE/SOLUT I O N
Lack of power . Check to see that power is available, that the power
1
cord is attached, and that the processor unit fuse is not b lown .
Figure 5 - 1 .
2
Pos s ib l e power cord defect or defective power switch .
3 . 2 , "Power Cord Check" and Section 3 . 3 , "Power Switch Check . "
3
Pos s i b l e cabl ing defect or defective fan .
Checks . "
Replace the fan assembly o r return the processor unit to
IBM for repair .
4
Defective beeper . Replace the keypad .
5
Poss ib l e defective vertical board assembly , defective wiring or P500
cab l ing .
See Sect ion 3 . 4 ,
"C ab l e Checks . "
6
Power supply fai lure . See Section 3 . 5 , " Power Supp ly Check . "
7
Pos s ib l e printer mal function or defective printer /plotter
See Section 2 . 1 0 , "Printer/Plotter Probl ems , " Section 2 . 6 ,
boar d .
"Printer/Plotter
"Printer/Plotter S e l f Tes t . "
8
Perform
feature loading check . Rep lace the feature board i f it is
mal funct ioning.
3 . 1 1 . 2 , "Feature Board Loading Check . "
Pos s ib l e keypad defect or an automat ic diagnos tic test failed .
9
Sect ion 2 . 5 , "Keypad and Softkey Problems . " and
matic Diagnostic Testing . "
1 0
Pos s ib l e CRT display unit fai lure or defective cab l e .
2 . 7 , "CRT Display Prob l ems " and Chapter 4 , "Cable Checks . "
1 1
Defect ive p l anar board or defective Memory Management Unit (MMU)
board if so equipped . Observe the yel low LED on the MMU board through
the opening in the processor unit back p l ate .
ye l low LED is on, replace the MMU interface assembly and the p l anar
board . I f the yel low LED is o f f , replace the MMU board and the MMU
interface assemb ly .
the MMU board , and the MMU interface assembly . Return the processor
unit to IBM for repair .
"Vert ical Board Check" and Chapter 4 ,
Control
Prob l ems , "
I f it i s not , replace the p l anar board . See Sect ion
If the LED is f l ashing , replace the p l anar board ,
See Section
See Chapter 4 , "Cab l e
control
and
Section
3 . 1 3 ,
Section 2 . 3 , "Auto
See Sect ion
See Figure 5-1 . I f the
Fault Detection 2 - 3
See
See
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