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Troubleshooting & Repair Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 288
13.5. SUBSYSTEM CHECKOUT
The preceding of this manual discussed a variety of methods for identifying possible sources of failures or
performance problems within the analyzer. In most cases this included a list of possible causes. This describes
how to determine individually determine if a certain component or subsystem is actually the cause of the problem
being investigated.
13.5.1. AC MAINS CONFIGURATION
The analyzer is correctly configured for the AC mains voltage in use if:
1. The Sample Pump is running.
2. The GFC Wheel motor is spinning. LED’s D1 & D2 (located on the sync/demod PCA) should be
flashing.
3. If incorrect power is suspected, check that the correct voltage and frequency is present at the line input
on the rear panel.
If the unit is set for 230 VAC and is plugged into 115VAC, or 100VAC the sample pump will not start,
and the heaters will not come up to temperature.
If the unit is set for 115 or 100 VAC and is plugged into a 230 VAC circuit, the circuit breaker built into
the ON/OFF Switch on the Front Panel will trip to the OFF position immediately after power is
switched on.
13.5.2. DC POWER SUPPLY
If you have determined that the analyzer’s AC mains power is working, but the unit is still not operating properly,
there may be a problem with one of the instrument’s switching power supplies. The supplies can have two faults,
namely no DC output, and noisy output.
To assist tracing DC Power Supply problems, the wiring used to connect the various printed circuit assemblies
and DC Powered components and the associated test points on the relay board follow a standard color-coding
scheme as defined in the following table.
Table 13-6: DC Power Test Point and Wiring Color Codes
NAME TEST POINT# TP AND WIRE COLOR
Dgnd 1 Black
+5V 2 Red
Agnd 3 Green
+15V 4 Blue
-15V 5 Yellow
+12R 6 Purple
+12V 7 Orange