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70 F300S/F300SQ Ultraviolet Lamp System
Lamp control at
OFF, or from
OFF to
STANDBY
EXT INTLK
indicator lights
Open control input. A jumper or an external circuit between
J105A-9 and J105A-10 must be closed by
a jumper or an external switch.
Poor connection Disconnect all power. Reseat control board
assembly connections. Try again.
Control card Replace the control card.
Switch from
OFF to
STANDBY or
from LAMP ON
to STANDBY
LAMP OUT
indicator lights
Shorted photocell Press LAMP OFF switch. Attach voltmeter
probes to Photocell Voltage Test Points.
Press the STANDBY switch. Measure the
photocell voltage between Photocell
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.
Table 18. Troubleshooting/Fault Diagnosis (continued)
Operation
Signal/
Other
Symptoms
Possible Cause Corrective Action