Teledyne Camera Accessories T100 ユーザーズマニュアル

The most important status LED on the relay board is the red I

2

C Bus watch-dog LED, 

labeled  D1  (or W/D), which indicates the health of the I

2

C communications bus. This 

LED is located in the upper left-hand corner of the relay board when looking at the 
electronic components. If D1 is blinking, then the other LEDs can be used in 
conjunction with the DIAG menu I/O functions to test hardware functionality by 
switching devices on and off and watching the corresponding LED turn on or off.  The 
LED only indicates that the logic signal for an output has been activated.  If the output 
driver (i.e. the relay or valve driver IC) is defective, then the LED will light up, but the 
attached peripheral device will not turn on. 

D1 red 

Watchdog Circuit; I

2

C 

bus operation. 

Continuously 

ON or OFF 

Failed/Halted CPU 
Faulty Mother Board, Valve Driver board or 
Relay PCA 
Faulty Connectors/Wiring between Motherboard, 
Valve Driver board or Relay PCA 
Failed/Faulty +5 VDC Power Supply (PS1) 

 

The standard analyzer has one main flow path. With the IZS option installed, there is a 
second flow path through the IZS oven that runs whenever the IZS is on standby to 
purge SO

2

 from the oven chamber. The IZS flow is not measured so there is no reading 

for it on the front panel display.  The full flow diagrams of the standard configuration 
(refer to Figure 3-18) and with options installed (refer to Figure 3-19 and Figure 3-20) 
help in troubleshooting flow problems. In general, flow problems can be divided into 
three categories: 

  Flow is too high 
  Flow is greater than zero, but is too low, and/or unstable 
  Flow is zero (no flow) 
When troubleshooting flow problems, it is essential to confirm the actual flow rate 
without relying on the analyzer’s flow display. The use of an independent, external flow 
meter to perform a flow check as described in Section 12.5.2 is essential. 

If the pump is operating but the unit reports a XXXX gas flow, do the following three 
steps: 

  Check for actual sample flow 
  Check pressures 
  Carry out a leak check 
To check the actual sample flow, disconnect the sample tube from the sample inlet on 
the rear panel of the instrument. Ensure that the unit is in basic SAMPLE mode. Place a 

06807C DCN6650