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Troubleshooting and Service
11.2. USING THE INTERNAL ELECTRONIC STATUS LEDS
11.2.1. CPU STATUS INDICATOR
11.2.2. RELAY PCA STATUS INDICATORS
2
11.2.2.1. I
C BUS WATCHDOG STATUS LEDS
Table 11-3: Relay PCA Watchdog LED Failure Indications
LED
D1
(Red)
(Watchdog Circuit)
202
Teledyne API T802 Paramagnetic O
Several LEDs are located inside the instrument to assist in determining if the
2
analyzer's CPU, I
C bus and relay board 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 to 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. If after 30 – 60 seconds neither the DS5 is
flashing or no characters have been written to the front panel display, then the
CPU is bad and must be replaced.
Motherboard
Figure 11-3:
There are sixteen status indicator LEDs located on the Relay PCA. Some are not
used on this model.
The most important is D1 (which indicates the health of the I
Function
Fault Status
Continuously ON
2
I
C bus Health
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
Failed/Halted CPU
Faulty Motherboard, Keyboard or Relay PCA
or
Faulty Connectors/Wiring between Motherboard,
Keyboard or Relay PCA
Failed/Faulty +5 VDC Power Supply (PS1)
Analyzer Operation Manual
2
2
C bus).
Indicated Failure(s)
07275B DCN6418
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