Teledyne GFC-7001T - Trace CO Analyzer - Manual (Page 271)

Troubleshooting and ServiceTeledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 271
12.5. SUBSYSTEM CHECKOUT
The preceding subsections 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. If the problem is not resolved at this point, the next
step is to check the subsystems. This subsection describes how to determine whether an
individual component or subsystem is the cause of the problem being investigated.
12.5.1. AC MAINS CONFIGURATION
The analyzer is correctly configured for the AC mains voltage in use if:
 The GFC Wheel motor is spinning. LEDs D1 & D2 (located on the sync/demod
PCA) should be flashing.
 If incorrect power is suspected, check that the correct voltage and frequency is
present at the line input on the rear panel.
Note • If the unit is set for 230 VAC and is plugged into 115VAC, or 100VAC the
sample pump (if equipped) 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.
12.5.2. 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 12-6: 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