Teledyne API T703/T703U Calibrator Operation Manual General Troubleshooting & Service
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Status of O
3
Generator Heater status
Faulty Temperature Sensor
Failed AC Relay
Faulty Connectors/Wiring
8.4. SUBSYSTEM CHECKOUT
The preceding sections of this manual discussed a variety of methods for
identifying possible sources of failures or performance problems within the T703
calibrator. In most cases, this includes a list of possible components or
subsystems that might be the source of the problem. This section describes how
to check individual components or subsystems to determine if which is actually
the cause of the problem being investigated.
VERIFY SUBSYSTEM CALIBRATION 8.4.1.
A good first step when troubleshooting the operation of the T703 calibrator is to
verify that its major subsystems are properly calibrated. These are:
Test Channel D > A conversion (see Section 4.9.2).
Gas pressure calibration (see Section 6.3).
Photometer calibration (see Section 6.1).
O3 generator calibration (see Section 6.2).
AC MAIN POWER 8.4.2.
The T703 calibrator‟s electronic systems will operate with any of the specified
power regimes. As long as system is connected to 100-120 VAC or 220-240
VAC at either 50 or 60 Hz it will turn on and after about 30 seconds show a front
panel display.
Internally, the status LEDs located on the Relay PCA, motherboard and CPU
should turn on as soon as the power is supplied.
If they do not, check the circuit breaker built into the ON/OFF switch on the
instruments front panel
CAUTION
SHOULD THE AC POWER CIRCUIT BREAKER TRIP, INVESTIGATE AND CORRECT
THE CONDITION CAUSING THIS SITUATION BEFORE TURNING THE
CALIBRATOR BACK ON.
DC POWER SUPPLY 8.4.3.
If you have determined that the calibrator‟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
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