Hach-Lange SURFACE SCATTER 7 sc Turbidimeter - Manual (Page 50)

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Troubleshooting
Table 7 presents sensor warnings displayed in the Event Log,
possible causes and corrective actions.
12 INT FLASH FAIL Internal copy of the application code has failed. Self-recovery should occur.
13 ENGLISH ONLY English only device driver file. Update the device driver with the latest version.
14 VREF WARN ADC voltage reference is out of specification.
15 SERVICE WARN SS7 sc is currently in service mode
Table 6 Warning Codes (continued)
Warning
Number
Displayed Warning Definition/Resolution
Table 7 General Troubleshooting
Sensor Error
or Warning
Possible Cause Corrective Action
LAMP FAIL
Lamp burned out Replace the lamp. See section 6.4.1 on page 40 .
Lamp unplugged Restore connection
+12 V connection loose at controller Restore connection
Dislodged lamp Reinstall lamp
Bad circuit board in turbidimeter head Contact the Technical Support Department.
Low Readings
Detector coated/dirty
See section 6.3.1 on page 40 .
Contact the Technical Support Department.
Lens coated/dirty Clean the lens using isopropyl alcohol and a cotton swab.
Obstructed light path Remove obstruction
See LAMP FAIL causes above See LAMP FAIL corrective actions above
VIN FAIL
Loose connection at sc100 Tighten connection of cable at sc100
SS7 sc to sc100 cable too long
Make sure that if an extension cable is used, only one is
present and is no longer than 7 meters (approximately
30 feet).
Fluctuation in voltage Turn instrument power off and back on.
Bad detector assembly Replace detector assembly (Cat. No. 71221-00).
ADC FAIL
Fluctuation in voltage Turn instrument power off and back on.
Bad detector assembly Replace detector assembly (Cat. No. 71221-00).
DARK WARNING
Light Leak—SS7 sc enclosure door is
open during Power Up or Zero
Electronics
Make sure the door is closed, then perform ZERO
ELECTRONICS in the CALIBRATION MENU.
Bad detector Assembly Replace detector assembly (Cat. No. 71221-00).