Model 14 Oxygen Analyzer
7.3 Troubleshooting the Electronics
7-3
WARNING!
Never attempt to service before disconnecting the instrument
from the main power line.
MALFUNCTION POSSIBLE CAUSE REMEDIES
No indication No power; instrument is not Check for power, then check
connected correctly if connected properly
Defective fuse Check fuse
Instrument’s power supply set for Check jumpers on power supply board for
wrong line voltage correct voltage settings
Ribbon cable connecting power with Verify that the ribbon plugs are
CPU board not properly plugged in connected properly
Connection between CPU board and Check plug connections
measurement module loose
Short circuit in power supply board Visually check power supply board for shorts
Hardware is defective Call the Service Technician
LCD displays undefined Malfunctioning CPU board or Using the Instruction Manual, program the
characters processor instrument to load the default values
CPU hardware RESET the instrument by temporarily
interrupting the power (5-10 seconds)
Call the Service Technician
Keyboard does not CPU malfunctioning, external If there is no response, RESET the
operate; all keys are interferences instrument by temporarily interrupting the
inactive power (5-10 seconds). Check each key
again. If there is no change, call the
Service Technician.
Measurement is not Instrument was programmed Recheck programmed parameters. Do they
correct incorrectly agree with the probe’s characteristics?
System, including probe, not Calibrate the whole system
calibrated correctly (with probe connected)
Probe connected wrong Recheck all probe connections
Probe malfunctioning, possibly Visually check the condition of the probe.
incompatible with the application Is the application within the probe’s
specifications?
CPU board is defective If error persists, call the Service Technician
Measurement is not stable Faulty probe Check the condition of the probe. Is it
contaminated?
Probe connected wrong Verify the probe is connected properly
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