If the complaint for NEC P8000 printer was a missing line across the printout, immediately we will suspect the printer head or the ribbon or even sometime the ribbon mask. Among so many brand of dot matrix printer, only this model have one common fault which is the printer head and the printer driver ic’s spoilt.
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Recently my company D-link Ethernet broadband router broke down and I can’t access the internet. The problem was no power but there was 5 volts output from the power adapter, so this proof that the router itself not working. As usual we as electronic repairer do not buy any new equipment unless we have inspected the equipment our self. If we found that the equipment is beyond repair such as lightning strike or no spare parts then only we give up and buy a new unit. Continue reading »
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If you already owned electronic repair shop and wish to expand your business to become an Authorized Service Center for certain companies, then you may have to consider some changes in your electronic repair shop. If you could secure a deal as one of the authorized service center, your company are sure to have plenty of work to do and a secure future.
Whatever new model of equipment that comes to your place for repair, you will be provided parts and schematic diagram too. You can take this opportunity to learn the new circuit or designed for the particular equipment. In other words, you are getting the most up-to-date information for the equipment you are contract with.
Once you got hold of the equipment repair secrets, you can then apply the knowledge on other type of equipment that comes across your repair bench. Just take this scenario for example, if you are the authorized service center for a company that deals with LCD Monitor, whatever knowledge you learn from the Monitor LCD repair can be apply to LCD TV repair. This will truly widen your knowledge and you are not bound for LCD monitor repair only.
Setting up your electronic repair shop to become an authorized service centre is not an easy task. Your electronic repair shops needs to meet the company or manufacturers’ criteria or requirement first before they can appoint your repair company as an Authorized Service Center.
They must set some guidelines because your company represents their image. If there is any part in your company that makes the customers not happy, their good image or brand name may be tarnished as well. Continue reading »
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While working in the system, you might see the dial-up connection dialog coming up automatically. This is caused by some application which is trying to connect to the internet. The exact application is unknown. Most applications are configured/designed to check for updates automatically by contacting home. Some applications notify the user before contacting their servers, most don’t. This may be caused by parasites as well. Adware contact their servers to fetch Ads and some Trojan may even send out your valuable information.
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Volitans has published v2.0 of SMART Utility, a diagnostic tool for hard drives. The software taps into the SMART monitoring technology built into hard drives, and presents status information in a more convenient and legible form. The app additionally attempts to warn users about impending disk failures, with the aim of allowing time to transfer material to a different location.
New to v2.0 are the ability to run built-in self-tests, and preferences that can limit alerts to the discovery of new problems. Temperatures can now be displayed in Fahrenheit, and Growl users can receive notifications for scans, updates, and impending or total failures. SMART Utility requires Mac OS X 10.4 or better, and costs $25.
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If a system isn’t producing the desired end result, look for what it is doing correctly; in other words, identify where the problem is not, and focus your efforts elsewhere. Whatever components or subsystems necessary for the properly working parts to function are probably okay. The degree of fault can often tell you what part of it is to blame. Continue reading »
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Set up instrumentation (such as a datalogger, chart recorder, or multimeter set on “record” mode) to monitor a signal over a period of time. This is especially helpful when tracking down intermittent problems, which have a way of showing up the moment you’ve turned your back and walked away.
This may be essential for proving what happens first in a fast-acting system. Many fast systems (especially shutdown “trip” systems) have a “first out” monitoring capability to provide this kind of data. Continue reading »
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Closely related to the strategy of dividing a system into sections, this is actually a design and fabrication technique useful for new circuits, machines, or systems. It’s always easier begin the design and construction process in little steps, leading to larger and larger steps, rather than to build the whole thing at once and try to troubleshoot it as a whole. Continue reading »
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In a system with multiple sections or stages, carefully measure the variables going in and out of each stage until you find a stage where things don’t look right.
Example 1: A radio is not working (producing no sound at the speaker))
What to do: Divide the circuitry into stages: tuning stage, mixing stages, amplifier stage, all the way through to the speaker(s). Measure signals at test points between these stages and tell whether or not a stage is working properly. Continue reading »
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If a system is composed of several parallel or redundant components which can be removed without crippling the whole system, start removing these components (one at a time) and see if things start to work again.
Example 1: A “star” topology communications network between several computers has failed. None of the computers are able to communicate with each other.
What to do: Try unplugging the computers, one at a time from the network, and see if the network starts working again after one of them is unplugged. If it does, then that last unplugged computer may be the one at fault (it may have been “jamming” the network by constantly outputting data or noise).
Example 2: A household fuse keeps blowing (or the breaker keeps tripping open) after a short amount of time.
What to do: Unplug appliances from that circuit until the fuse or breaker quits interrupting the circuit. If you can eliminate the problem by unplugging a single appliance, then that appliance might be defective. If you find that unplugging almost any appliance solves the problem, then the circuit may simply be overloaded by too many appliances, neither of them defective.
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