Status Led's; Motherboard Status Indicator (Watchdog); Figure 11-2: Switching Signal I/O Functions - Teledyne 200E Instruction Manual

Troubleshooting & Repair
• All of the components and functions that are normally under instrument control can
be manually changed.
• Analog and digital output signals can be manually controlled.
This allows to systematically observe the effect of these functions on the operation of the
analyzer. Figure 11-2 shows an example of how to use the signal I/O menu to view the raw
voltage of an input signal or to control the state of an output voltage or control signal. The
specific parameter will vary depending on the situation.

11.1.4. Status LED's

Several color-coded, light-emitting diodes (LED) are located inside the instrument to
determine if the analyzer's CPU, I
functioning properly.

11.1.4.1. Motherboard Status Indicator (Watchdog)

A red LED labeled DS5 in the upper portion of the motherboard (Figure 11-3), 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 visible on the front
panel display but DS5 does not flash then the program files have become corrupted.
Contact customer service because it may be possible to recover operation of the analyzer. If
30 - 60 seconds after a restart neither DS5 is flashing nor any characters are visible on 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 the analyzer
should not respond (either with locked-up or dark front panel).
192

Figure 11-2: Switching Signal I/O Functions

2
C communications bus and the relay board are
Model 200E Instruction Manual
044100102 Rev A