Casio UP-250 Technical Manual page 79

1 POWER LED does not light
1
Is power supply
cable connected
properly?
Yes
Does external power
supply have proper output
voltage rating? (approximately
+40 V in no-load
condition)
Yes
Has fuse F1 on
main PCB blown?
No
Replace main PCB
End
No
Connect power supply cable properly.
No
Replace external power supply.
Yes
Make sure main PCB does not
have any damage such as burns.
(See Replacing the fuse in Chapter 5)
— 70
No
OK?
Yes
End
No
OK?
Yes
End
Replace Fuse F1
No
OK?
Yes
End
—