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·FAILURE SYMPTOMS TO FRO LIS_T
-Use this list as a quick reference and for the intermittent problem.
-The FROs in each work station element are as follows:
Logic element ••••.•••.••• Logic, Power
Keyboard element •••.••••• KBD-card, cable, Clicker,
Setup-switches, Key-module
Video element •••••••••••• Analog, CRT
Failure Symptom
• MACHINE CHECK message appears with:
LOGIC
LOGIC OR KEYBOARD
KEYBOARD
• Light
1
stays off in
TEST
mode
• Light 1 stays on in TEST mode
• TEST/NORMAL
switch operation failure
• Display blank or green background
(No cursor, no divider line, and no characters)
• Display dim at maximum contrast/brightness
• Display is tilted or shifted
•
Raste~_visible
at minimum brightness
• Display overflows screen at maximum
bright~ess
• Brightness or contrast control problem
· • Dual intensity function failure
• Displayc::.is _out of focus.··
• Display.::-is_: out of_--sy.nchroniza·ti-o.n :
(Movin-g).~::-;::~
• Display. is _not stable - · · · ·
• Size of display area
-is
not correct-:-:-·:-:::-::
•
~rang
horizontal positi·on
• Extra/missing dot or test pattern failure
• Cursor error (missing, random location)
• Other display failure
• Setup switch failure
• One key failure
• Keyboard is not
workin~
at
all
• Displayed character is different from keyed-in
• Keyboard clicker failure
• Printer failure (See the printer
RCMI)
11/10/79
2-8
Suspected FRO
Logic/Power
Logic/KBD-card/cable
KBD-card/cable/Logic
Logic/Power/Analog
Logic
Logic
. Analog/Logic
Analog/CRT
CRT
Analog
Analog
Analog/Logic
Analog/Logic
Analog/Logic/CRT
Analog/Logic::-:::;-_..:;::
Analog/Logic/Power
Analog/Power/Logic
(or voltage source)
Logic/Analog/CRT
Logic
Logic
Logic/Analog/CRT
Setup-switches/
KBD-card/cable/Logic
Key-module/KBD-card
KBD-card/cable/Logic
KBD-card/Logic
(Logic/KBD iaismatch)
Clicker/KBD-card
Logic-
•
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