5-9
Teledyne Analytical Instruments
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SymptomSymptom
SymptomSymptom
Symptom CauseCause
CauseCause
Cause What What
What What
What TT
TT
To Doo Do
o Doo Do
o Do
Cell lacks sensitivity (contin-
ued.) Faulty humidity control (contin-
ued.) • Turn humidifier control
completely counter-
clockwise.
• Turn on main power.
• While watching the
voltmeter, turn the
humidifier control clock-
wise; the meter reading
should go from 0–50
milliamps. If not, replace
the humidifier heater
element or the humidifier
heater control. To deter-
mine which should be
replaced, see paragraph
below.
If there is no current, either
the humidifier element or
control is defective. To
determine which it is:
• Turn the humidifier control
knob fully ccw.
• Disconnect the voltmeter
from TS1-5 and orange
wire. Reconnect the
orange wire.
• Change the voltmeter
function to 200V AC.
• Place the voltmeter
across TS1-5 and termi-
nal TS1-4.
• Watching the meter, turn
the humidifier control
knob cw and watch the
voltmeter read 0–110 to
120V AC.
• If not, replace R2 (behind
the control knob); see
paragraph below.
• If there is voltage, replace
the heater element; see
paragraph below.