Table 18. Troubleshooting/Fault Diagnosis (continued)

 

Signal/

 

 

Operation

Other

Possible Cause

Corrective Action

 

Symptoms

 

 

 

 

 

 

 

 

Open control input.

A jumper or an external circuit between

Lamp control at

EXT INTLK

 

J105A-9 and J105A-10 must be closed by

OFF, or from

indicator lights

 

a jumper or an external switch.

OFF to

 

 

 

 

Poor connection

Disconnect all power. Reseat control board

STANDBY

 

 

 

assembly connections. Try again.

 

 

 

 

 

 

 

 

 

Control card

Replace the control card.

 

 

 

 

Switch from

LAMP OUT

Shorted photocell

Press LAMP OFF switch. Attach voltmeter

OFF to

indicator lights

 

probes to Photocell Voltage Test Points.

STANDBY or

 

 

Press the STANDBY switch. Measure the

from LAMP ON

 

 

photocell voltage between Photocell

to STANDBY

 

 

Voltage Test Points while in STANDBY.

 

 

 

The voltage level indicated should be

 

 

 

greater than +9.3 VDC. If the voltage level

 

 

 

indicated is less than this value, the

 

 

 

photocell is defective. Replace the

 

 

 

photocell assembly.

 

 

 

 

70F300S/F300SQ Ultraviolet Lamp System