Teledyne TRACE OXYGEN ANALYZER 356WA - Manual (Page 33)

5-11 Teledyne Analytical Instruments
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Symptom Symptom Symptom Symptom Symptom Cause Cause Cause Cause Cause What What What What What T T T T To Do o Do o Do o Do o Do
Faulty triac (Q6) in heater
control or faulty triac driver (A4)
(continued.) Cell lacks sensitivity (contin-
ued.) • Disconnect the thermo-
switch by removing one of
the wires from TS4
terminal 3. Meter should
show voltage.
• If voltage shows, short
terminals 3 and 4 with a
test jumper. Meter reading
should drop to about zero
(less than 10 VAC.)
• If power fails to go on and
off as jumper is alter-
nately installed and
removed between termi-
nals 3 and 4, the triac or
triac driver is probably at
fault and should be
replaced.
• If power does go on and
off, the thermoswitch (P/N
T22) is faulty and should
be replaced.
• If none of the above
improve the sensitivity,
replace the cell.