Teledyne 356WA Instruction Manual page 32

5 5 Maintenance & Maintenance & Maintenance & T T T T T r r r r r oub
5 5 5 Maintenance & Maintenance &
Symptom Symptom Symptom
Symptom Symptom
Cell lacks sensitivity (contin-
ued.)
5-10
oub oub leshooting leshooting
oubleshooting oub leshooting leshooting
Cause Cause Cause
Cause Cause
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).
Teledyne Analytical Instruments
Model 356WA A A A A Model 356W Model 356W
Model 356W Model 356W
What What What T T T T T o Do
What What
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.)
o Do o Do o Do
o Do