4. Troubleshooting
18
NG
Power-up Self test?
Yes
Defective NP Board
Flow 5
OK
Single key is
defective?
No
All Keys?
Defective NP Board
Defective key switch on PNL Board
Yes
Check keys for row and column wirings,
using the key matrix below, U20 on NP
Board is defective, if wiring is okay.
Symptom: No key response
Table 4.6 Key matrix
Sig. KS3
KS2
KS1
KS0
KR0
PLOT
ON/OFF
+/
!
EVENT
MOB
KR1 GOTO
CLEAR
NU/CU
ENT
KR2
WPT
RTE
TONE
MENU
ESC
KR3 MARK CENTER
DISPLAY
SEL
KR4
Содержание GP-90
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