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Teledyne Analytical Instruments5-10
5 Maintenance & 5 Maintenance &
5 Maintenance & 5 Maintenance &
5 Maintenance &
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leshootingleshooting
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Model 356WModel 356W
Model 356WModel 356W
Model 356W
AA
AA
A
To replace humidifierTo replace humidifier
To replace humidifierTo replace humidifier
To replace humidifier
controlcontrol
controlcontrol
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 humidifierTo replace humidifier
To replace humidifierTo replace humidifier
To replace humidifier
heater elementheater element
heater elementheater 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.)
SymptomSymptom
SymptomSymptom
Symptom
CauseCause
CauseCause
Cause
What What
What What
What
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o Doo Do
o Doo 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).