Using The Internal Electronic Status Leds; Cpu Status Indicator; Relay Pca Status Leds - Teledyne T200 Operation Manual

Troubleshooting & Service

12.3. USING THE INTERNAL ELECTRONIC STATUS LEDS

12.3.1. CPU STATUS INDICATOR

12.3.2. RELAY PCA STATUS LEDS

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12.3.2.1. I C BUS WATCHDOG STATUS LEDS
Table 12-4: Relay PCA Watchdog LED Failure Indications
LED Function
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D1 I C bus Health
(Red) (Watchdog Circuit)
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Teledyne API – T200 NO/NO2/NOx Analyzer Operation Manual
Several LEDs are located inside the instrument to assist in determining if the analyzer‟s
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CPU, I C bus and Relay PCA are functioning properly.
DS5, a red LED, that is located on upper portion of the motherboard, just to the right of
the CPU board, flashes when the CPU is running the main program loop. After power-
up, approximately 30 – 60 seconds, DS5 should flash on and off. If characters are
written to the front panel display but DS5 does not flash then the program files have
become corrupted, contact Teledyne API's Customer Service Department (see Section
12.10) because it may be possible to recover operation of the analyzer. If after 30 – 60
seconds, neither DS5 is flashing nor have any characters been written to the front panel
display then the CPU is bad and must be replaced.
Motherboard
Figure 12-2:
There are sixteen LEDs located on the Relay PCA. Some are not used on this model.
The most important is D1 (see Figure 12-3), which indicates the health of the I
Fault Status
Continuously ON
or
Continuously OFF
If D1 is blinking, then the other LEDs can be used in conjunction with DIAG Menu
Signal I/O to identify hardware failures of the relays and switches on the Relay PCA.
CPU Status LED
CPU Status Indicator
Indicated Failure(s)
Failed/Halted CPU
Faulty Motherboard, Touchscreen or Relay PCA
Faulty Connectors/Wiring between Motherboard,
Touchscreen or Relay PCA
Failed/Faulty +5 VDC Power Supply (PS1)
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C bus.
06858E DCN7057