5-11
Teledyne Analytical Instruments
T
T
T
T
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race Oxyg
race Oxyg
race Oxyg
race Oxygen Anal
en Anal
en Anal
en Anal
en Analyz
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er
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Maintenance &
Maintenance &
Maintenance &
Maintenance &
Maintenance & T
T
T
T
Trrrrroub
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oubleshooting 5
leshooting 5
leshooting 5
leshooting 5
leshooting 5
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.
