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Teledyne API T802 Paramagnetic O
11.6. SUBSYSTEM CHECKOUT
11.6.1. AC MAINS CONFIGURATION
11.6.2. DC POWER SUPPLY
07275B DCN6418
Analyzer Operation Manual
2
Section 10 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.
The analyzer is correctly configured for the AC mains voltage in use if:
1. The Sample Pump is running.
2. 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.
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 11-5:
DC Power Test Point and Wiring Color Codes
NAME
Dgnd
+5V
Agnd
+15V
-15V
+12V Ret (ground)
+12V
A voltmeter should be used to verify that the DC voltages are correct per the
values in the table below, and an oscilloscope, in AC mode, with band limiting
turned on, can be used to evaluate if the supplies are producing excessive noise (>
100 mV p-p).
TEST POINT#
TP AND WIRE COLOR
1
2
3
4
5
6
7
Troubleshooting and Service
Black
Red
Green
Blue
Yellow
Purple
Orange
209
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