Teledyne 356WA instruction manual Symptom Cause, What To Do

5 Maintenance & Troubleshooting Model 356WA

Symptom Cause What To Do

Cell lacks sensitivity (contin-	Faulty humidity control (contin-
	ued.)
ued.)

To replace humidifier 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 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)Cell compartment not at proper temperature (120 °F).

e)Faulty triac (Q6) in heater control or faulty triac driver (A4).

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.)

5-10 Teledyne Analytical Instruments