IBM System 9000 Troubleshooting And Servicing page 29

B looming video
Doub l e image
F luttering or shifting image
Flicker ing s creen or
intermittent image
Fuzzy or out - of - focus image
Miss ing or broken characters
Ro l l or tear
Too br ight , no b rightnes s cont rol
Vert ical l ines on screen
Vertical l ines on character
Single l ine o f numbers
Smeared or mu ltiple image
CRT disp l ay unit
CRT display unit
Resul ting from a l ternating magnetic
field caused by rotat ing machinery or
Move or shield the CRT .
power l ines .
Loose connection , CRT display unit ,
p l anar board - - Check that connections
are tight . If problem persists , per­
form test 1 6 .
See Sect ion 3 . 9 , "CRT
Contro l ler Test - - Test 16 . "
fai l s , replace planar board .
passes , replace CRT disp l ay unit .
CRT display unit - - Replace
CRT display unit ,
print screen . I f print
miss ing or b roken characters , rep lace
p l anar board . If
display unit .
CRT disp l ay unit ,
Per form test 16 . See Section 3 . 9 , "CRT
Contro l l er Test - - Test 16 . "
passes , replace CRT disp l ay unit .
test fails , replace p l anar board .
CRT display unit - - replace
P l anar board, CRT display unit , fea­
ture board - - Perform test 1 6 .
Sect ion 3 . 9 , "CRT Control ler Test
I f test passes , replace CRT
Test 16 . "
display unit . I f test fai l s , perform
feature board loading check . See Sec­
tion 3 . 1 1 . 2 ,
"Feature Board Loading
Check . " Replace
mal functioning . I f
p l anar board .
P l anar board replace
P l anar board replace
P l anar board rep lace
Fault Detection 2 - 14
replace
replace
I f test
I f test
p lanar board
copy has
not , rep lace CRT
planar board
I f test
I f
See
-­
feature board i f
not , replace