TXR 325D, Руководство по обслуживанию

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M-2008-7-15
Standard Frequency Series Generators
Maintenance 5
SECTION 5
TROUBLESHOOTING TECHNIQUES
5.1 ESTABLISHING TROUBLESHOOTING TECHNIQUES
Effective Troubleshooting Techniques for Single and Three Phase X-ray Systems involves ones sight, hearing,
training and understanding the operation of circuits and devices used in and with x-ray equipment. This
manual is written for those who do not have a clear understanding of the Principles of X-ray. Other helps are
included throughout the Manual where we believe they may be needed. A complete Training Manual BMET 4
has been written and is available on CD for those who wish to have a better understanding of x-ray systems,
devices and instruments.
5.1.1 ESSENTIALS REQUIRED FOR PRODUCING X-RAYS
Three essentials are required to produce x-rays. A vacuum tube (x-ray tube), a source of free electrons that
can be boiled off a filament, within the vacuum tube (x-ray tube filaments) and a High Voltage Difference of
Potential with the Anode of the X-ray Tube being Positive in respect to the Cathode. It is fairly easy to produce
X-rays but it is not so easy to control them.
5.1.2 THREE KEY INDICATORS FOR EFFECTIVE TROUBLESHOOTING
Three main indicators reveal problems that exist in x-ray equipment and these provides the Keys to establishing
effective troubleshooting Techniques. The indicators are:
1. High MA, which can cause light images, dark images and kicking circuit breakers.
2. Low MA, which mainly causes light images.
3. No MA, which produces no radiation (no images).
Since the X-ray Tube requires certain compensated and regulated voltages, which is delivered by the High
Voltage Transformer, it is easy to determine which is the key to understand the circuit that needs testing,
analysis and repair. Since the KVP circuit is compensated for loading, it is somewhat independent. On the
other hand, the MA circuits are fully regulated but independent. The three Key indicators, High, Low, and No MA
cannot be discerned by our natural Senses. They can only be measured at the High Voltage Transformer.
5.1.3 MEASURING ESSENTIALS AT THE TANK
Regardless of ones training or experience, when x-ray machines have operational problems, it is always
best to measure the essentials at the Tank or High Voltage Transformer. After these essentials are measured,
you must believe what the MA or MAS Meter is revealing to you. Non invasive KVP, Timers and m/R meters
are great to use for calibration but they cannot identify every problem. As you will see in the troubleshooting
section there are voltages and voltages with time delays that are expected and must be measured at certain
points. Insert MA Meter into X-ray Control MA Circuit.
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