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Teledyne API – Model T700 Dynamic Dilution Calibrator Troubleshooting and Service
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9.3. USING THE INTERNAL ELECTRONIC STATUS LEDS
Several LEDs are located inside the instrument to assist in determining if the calibrators
CPU, I
2
C bus and Relay PCA are functioning properly.
9.3.1. CPU STATUS INDICATOR
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 DS5 does not flash
then the program files may have become corrupted; contact customer service because it
may be possible to recover operation of the calibrator. If after 30 – 60 seconds, DS5 is
flashing. then the CPU is bad and must be replaced.
Motherboard
CPU Status LED
Figure 9-2: CPU Status Indicator
9.3.2. RELAY PCA STATUS LEDS
There are seven LEDs located on the Relay PCA. Some are not used on this model.
9.3.2.1. I
2
C Bus Watchdog Status LEDs
The most important is D1, which indicates the health of the I
2
C bus).
Table 9-4: Relay PCA Watchdog LED Failure Indications
LED Function Fault Status Indicated Failure(s)
D1
(Red)
I
2
C bus Health
(Watchdog Circuit)
Continuously ON
or
Continuously OFF
Failed/Halted CPU
Faulty Mother Board, Valve Driver board or Relay PCA
Faulty Connectors/Wiring between Mother Board, Valve
Driver board or Relay PCA
Failed/Faulty +5 VDC Power Supply (PS1)
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.
06873B DCN6388