Teledyne 6200T - Sulfides Analyzer - Manual (Page 245)

6200T Total Sulfur Analyzer Troubleshooting
Teledyen Analytical Instruments 245
12.2. Status LEDs
Several color-coded, light-emitting diodes (LEDs) are located inside the instrument to
determine if the analyzer’s CPU, I
2 C communications bus and relay board are
functioning properly.
12.2.1. Motherboard Status Indicator (Watchdog)
DS5, a red LED on the upper portion of the motherboard, just to the right of the CPU
board, flashes when the CPU is running the main program. After power-up, DS5 should
flash on and off about once per second. If characters are written to the front panel
display but DS5 does not flash then the program files have become corrupted. Contact
Teledyne Analytical Instruments’s Customer Service department.
If DS5 is not flashing 30 - 60 seconds after a restart and no characters have been written
to the front panel display, the firmware may be corrupted or the CPU may be defective.
If DS5 is permanently off or permanently on, the CPU board is likely locked up and
should the analyzer not respond (either with locked-up or dark front panel), then replace
the CPU.
Motherboard
CPU Status LED
Figure 12-3: CPU Status Indicator
12.2.2. CPU Status Indicators
The LEDs on the CPU card (
Figure 13-14) are described as follows:
Power LED Red normally lit
IDE LED Green lit when active (read or write)