Gasboy 1000 Series FMS Diagnostic Manual - Manual (Page 95)

GASBOY Series 1000
6-10 03/07/03
Possible Cause Checks Corrective Action
Series 1000 port
communication cables
plugged into the wrong
connector. Check the Series 1000 port
communication cables to verify
that they are attached to the
desired connectors. (Upper
connector for RS-232; lower
for RS-422 communications.) Attach the communication
cables to the appropriate
communication connectors, if
incorrect.
No -12VDC. Using a DC voltmeter,
measure between the -12 and
ground test points on the MPU
PCB. Is -11.7 to -12.8
measured? Try to adjust the +5VDC of the
supply to +5.05 VDC. Replace
the power supply if proper -
12VDC level cannot be
reached.
Defective MPU PCB
communication section. Remove port communication
cable from MPU PCB and
connect RS-422 loopback
jumper to vacated port
connector. Perform diagnostic
test 5, selecting port to be
tested. If diagnostic test 5 passes,
remove RS-422 loopback
jumper and reconnect port
communication cable to MPU
PCB.
If diagnostic test 5 fails,
replace MPU PCB.
If RS-232, defective
communication wiring or data
terminal. Remove communication cable
from data terminal. Connect
RS-232 loopback jumper to
communication cable.
Perform diagnostic test 5,
selecting port to be tested. Repair communication wiring if
diagnostic test 5 fails.
Replace data terminal if
diagnostic test 5 passes.
Not Completely Dead, RS-422, 2 SHM'S, No RS-422 Communication
Possible Cause Checks Corrective Action
Defective data terminal. Remove communication cable
from data terminal. Connect
RS-232 loopback jumper to
communication cable.
Perform diagnostic test 5,
selecting port to be tested. Replace data terminal if
diagnostic test 5 passes.
Defective data terminal
communication cable. Locate the SHM connected to
the data terminal. Place the
SHM into loopback mode.
Perform diagnostic test 5,
selecting port to be tested. Replace or repair the data
terminal communications
cable if diagnostic test 5
passes.
Defective SHM. Locate the SHM in the Series
1000 post. Place the SHM
into loopback mode. Perform
diagnostic test 5, selecting the
port to be tested. Replace the SHM in the Series
1000 post if diagnostic test 5
fails.
Replace the SHM at the data
terminal end or repair the
wiring between the two SHMs
if diagnostic test 5 passes.