Gasboy CFN Series Diagnostic Manual - Manual (Page 25)

CFN System
0161 1-9
ABOUT THIS BOOK
This book was written to assist the authorized service representative (ASR) or technician in
troubleshooting the CFN systems and their components. The book is broken into sections, one
for each component. Each section consists of:
•
a description of the component
•
a visual layout
•
wiring connections
•
illustrations of the programmed circuit boards and their indicators, connectors, jumpers, and
switches
•
diagnostic test procedures
•
a troubleshooting (Problems) section.
USING THE PROBLEMS SECTION
The Problems section for each component lists common system problems, probable causes, and
corrective action to be taken. The probable causes and checks for each problem are presented in
logical sequence, allowing you to rule out one set of symptoms before going on to the next. Thus,
following the procedures as listed should help isolate your problem.
A double line at the end of a problem sequence indicates the last of the checks for that problem.
If your system still is not working, recheck your symptoms and follow another problem sequence if
necessary. If you encounter problems you cannot solve by using this manual, call GASBOY
Technical Service 1-800-444-5529.
Checks and corrective actions requiring voltage measurements assume familiarity with and are
done with a voltmeter unless noted that an oscilloscope or ohmmeter should be used.
TERMS USED IN THIS BOOK
The following symbols and terms are used in the diagrams and tables in this book:
COM Common
NC Normally closed
NO Normally open
Rx+, Rx- RS-485 receive signals
Sig signal
TB terminal block
TBK,
TBR, TBP, TBS RS-485 terminal
blocks. Respectively, output,
input, pulser, and switch
detect.
Tx+, Tx- RS-485 transmit signals
VAC, VDC Volts AC and Volts DC.
A horizontal line appearing above functions indicates that the function is active when 0 VDC is
measured. Any other measurement indicates the function is not active.
___________
POWER FAIL
indicates that when voltage is measured at 0 VDC, a power fail condition is
active.
The following symbols indicate wave patterns you may see when measuring voltages with an
oscilloscope: