Teledyne TRACE OXYGEN ANALYZER 356WA - Manual (Page 32)

Teledyne Analytical Instruments 5-10
5 Maintenance & 5 Maintenance & 5 Maintenance & 5 Maintenance & 5 Maintenance & T T T T Trrrrroub oub oub oub oubleshooting leshooting leshooting leshooting leshooting Model 356W Model 356W Model 356W Model 356W Model 356WA A A A A
To replace humidifier To replace humidifier To replace humidifier To replace humidifier To replace humidifier
control
control control control control:
• Shut off all power and
remove the AC power
cord from the power
source.
• Refer to wiring diagram D-
18633 (upper right-hand
corner of the control unit.)
Remove the wiring and
controls. Replace R2 with
appropriate part, P/N P31.
To replace humidifier To replace humidifier To replace humidifier To replace humidifier To replace humidifier
heater element
heater element heater element heater element heater element:
• Shut off all power and
remove the AC power
cord from the power
source.
• Refer to wiring diagram C-
18593 (left-hand side,
bottom of the cell com-
partment.)
• Pull out the block assem-
bly from the bottom of the
humidifier column; pull out
the heater element, and
unsolder the wires.
• Replace with new heater
element (P/N R139.)
Solder wires, turn the
terminals down into the
holder, and replace the
holder.
d) Verify that the power switch
is ON.
Check condition of 2A fuse.
e) • Remove the cell compart-
ment cover. Refer to
Interconnection diagram
A-18594 (upper left-hand
corner.)
• Connect voltmeter (set to
high AC) to terminals 1
and 2 of terminal strip
TS4 (Schematic diagram
D-18632, lower right-hand
corner; Wiring diagram C-
18593, upper left-hand
corner.)
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
Cell lacks sensitivity (contin-
ued.)
Faulty humidity control (contin-
ued.)
d) Cell compartment not at
proper temperature
(120 °F).
e) Faulty triac (Q6) in heater
control or faulty triac driver
(A4).