Gasboy 1000 Series FMS Diagnostic Manual - Manual (Page 92)

Troubleshooting
03/07/03 6-7 7
KEY READ/RECEPTACLE PROBLEM
Series 1000 does not respond correctly to keys. Terminal communication is fine. When
idle, system displays proper alternating message.
Possible Cause Checks Corrective Action
Bad key Run several keys to see if
problem is consistent.
Perform Preventive
Maintenance below.
Replace key if problem follows
key. If possible, re-encode
key and retry.
Defective Key I/F PCB
Defective MPU PCB
Defective key receptacle The DC signals between the
Key I/F PCB, MPU PCB, and
key receptacle occur quickly
and are best viewed with an
oscilloscope. To eliminate
lengthy oscilloscope
procedures, just follow the
corrective action. Replace the Key I/F PCB and
retest.
Replace the MPU PCB and
retest.
Replace the Key receptacle
and retest.
Preventive Maintenance
To prevent key read errors, perform the following preventive maintenance on the keys as needed:
clean the key's contacts using isopropyl alcohol and a toothbrush. Dip the toothbrush in the
alcohol and brush the contacts of the key until they are clean.