Gasboy CFN Series Diagnostic Manual - Manual (Page 425)

CFN Islander
12/26/02 13-57
No Island Loop communications. Display shows OUT OF SERVICE. All devices on Island
Loop are down.
Possible Cause Checks Corrective Action
Islander is down. Check logger or do a PRint
DIagnostics command for
indication that the Islander
(site) is not running. Do a RUN command if site is
down.
Defective Disable Pumps
PCB (formerly known as the
Emergency Stop PCB). Remove the wiring from the
terminal block on the board. Replace board if loop
communications while it is
disconnected.
Incorrect wiring of RS-485
junction board in the pedestal
or island loop devices. Verify all field wiring (Islander
I Installation Manual –
C35520, Islander II
Installation Manual –
C35963). Make wiring connections if
needed.
Defective RS-485 receiver IC
and Protected Driver Board. None. Replace U2 and U3 for
Islander I, U4 and U5 for
Islander II on the CPU Board.
When replacing U3 or U5,
replace the entire Protected
Driver Board (C05848), not
just the driver IC.
Defective Islander CPU
Board. None Replace the CPU Board.
Defective RS-485 junction
board. None. Replace the RS-485 junction
board.