Yokogawa Extractive Oxygen Gas Analyzer TDLS220 - Manual (Page 70)

<8 TROUBLESHOOTING> 8-2
IM 11Y01B02-01E-A 4th Edition September 11, 2012-00
8.1 Common Troubleshooting Steps
For most conditions the troubleshooting steps are common. In general, the most common issues with
the analyzer revolve around ensuring an adequate amount of the laser light is received at the detector.
Under any warning conditions it is recommended that the following steps are carried out prior to
contacting YOKOGAWA.
8.1.1 On Process Gas or Zero Gas or Span Gas
• Check Status LEDs. This will ensure that power is routed properly to the system components.
Status LEDs are listed below:
Blue LED #
(from left to right)
Voltage Use
D20 +5V Laser temp control power supply
D26 -15V Isolated power supply
D27 +15V Isolated power supply
D24 +8V DFB laser driver power supply
D23 -8V DFB laser driver power supply
D22 -12V DFB laser driver power supply
D16 -12V Detector board power supply
D19 -12V VCSEL laser driver power supply
D6 -15V Analog IO board power supply
D12 -15V FPGA board power supply
D18 +12V VCSEL laser driver power supply
D7 +12V LCD power supply
D8 +24V Main power supply
D9 +15V Analog IO board power supply
D10 +5V SBC power supply
D11 +15V FPGA board power supply
D13 +5V FPGA board power supply
D14 +6V FPGA board power supply
D15 +12V Detector board power supply
D17 +12V General 12V power supply