Common faults and solutions of electronic digital calendar 1. Electronic digital calendar is not powered on; This fault is mostly caused by partial damage of power supply. There are two power supply modes: transformer and switching power supply. Measuring whether there is voltage at the secondary pole of transformer can judge the quality of transformer. Measure the output voltage at DC 10V with a multimeter. If there is no voltage, the switching power supply is damaged.
Second, the electronic digital calendar crashed; This kind of fault is mostly caused by voltage instability and other interference. Replace the memory battery first, and in most cases, the fault can be eliminated. If it still doesn't work, turn on the power, unplug it and plug it in again, and some crashes will return to normal; If it doesn't work, you can short-circuit all the filter capacitors on the motherboard with tweezers without power-on, power on to see if they work normally, and finally check the crystal oscillator, and you can use the replacement in the synchronous clock core.
Third, there is a phenomenon of inaccurate walking; The voltage of 5V is low, the memory battery is under-voltage, and the crystal oscillator performance is poor. Repair the power supply to make it return to normal, and replace the battery and crystal oscillator.
Fourth, the circuit board is not bright.
Method: The circuit board is not bright, that is, the part showing the time and date is not working, and it is likely that the transformer is overloaded and burned out, so the transformer should be replaced.
Fifth, there is an error in the time and date of re-energizing.
Methods: This is a long-standing fault, probably because the circular electronic circuit board is out of power. Here, I also remind you to use a digital calendar when buying. If you don't use it for a long time, you will probably lose power, and then you will lose its memory function. In a word, products like digital calendars are afraid of being released and used.
Time adjustment method of household digital perpetual calendar The digital perpetual calendar adjuster has four keys, namely: Exit, Run (Down), Up and Set.
First, press first? Settings? Key (enter time setting state, and year? Blink? , can you press it? Up? Or? Running water (below)? Key to change the year, and then press? Settings? Press the key to blink to switch to Gregorian calendar? Month? , press? Up? Or? Running water (below)? Modify the key of the month; Day, hour, minute and second can be set in the same way;
Week, lunar month and day will change automatically with the change of Gregorian calendar.
Second, press again? Settings? Or? Quit key exits the time setting and returns to the normal time state.
Regarding the purchase of electronic perpetual calendar, from the aspect of product appearance technology
When purchasing an electronic calendar, we should first pay attention to the appearance of the product and whether the product is defective or damaged (such as glass, bottom case, etc.). ), whether the panel printing is neat and shiny, and whether the lines are clear; The display window is obviously blocked by foreign objects, etc. ;
In terms of product packaging
The packaging of products can also reflect the grade of products and the quality requirements of the whole manufacturer. From the aspects of shockproof structure, printing technology and material selection, it is generally known that enterprises with higher quality requirements also have higher requirements for product packaging, so the quality of packaging reflects the quality of products.
Secondly, from the aspect of product identification
Product identification is a statement and explanation indicating product name, place of origin, producer name, address, product quality, shelf life, instructions for use and other information. Product identification is provided by the manufacturer. Product identification is the quality information that producers give to product sellers and buyers, which helps them understand the composition, quality and standards of products (note: GB/T 22777-2008, national standard of electronic calendar), explains the use and maintenance of products, and plays the role of introducing products and guiding consumption. The contents of many product logos are marked on products or product packaging, which makes people clear at a glance and provides convenience for users and consumers to choose. With the development of economy and the intensification of product market competition, product identification has become more and more important and has become an inseparable part of products.
Improper or deceptive labeling of product identification will cause misunderstanding to users and consumers, bring inconvenience to others, and even cause serious infringement damage and product quality liability disputes. Therefore, consumers must pay attention to product identification when purchasing products.
In terms of product certification
The product certification system originated in Britain in the early 20th century. With the change of the times, it has become an effective means of product safety, quality and environmental protection evaluation, supervision and management. Today's consumers are buying safe goods. In addition to considering a certain cost performance, their consumption expectations are increasingly linked to the requirements of product safety, quality and environment. Therefore, when purchasing an electronic calendar, we should pay attention to product certification, such as 3C certification, AAA quality credit enterprise in China, ISO quality management mode certification, (CQC) China quality certification, (PICC) product safety and quality assurance, and so on.
From the point of view of product function
Display functions of products, including Gregorian year, month, day, time, temperature, week, lunar calendar, etc. Additional functions include: alarm on the hour, alarm on time, whether the button can be adjusted normally;
From the aspect of product performance
That is, the stability, safety and applicability of the product. The stability of products refers to the compatibility of electronic board hardware and software, hardware and hardware in electronic calendar, which is manifested as whether the LED digital drive is static or dynamic, whether there is flicker or broken pen. The safety of the product depends on whether the product has passed the relevant safety certification, and whether it is shockproof, fireproof and riot-proof. Applicability of products, because there are many series and specifications of products, and the materials of products are also divided into glass, plastic, aluminum alloy and so on. So when buying, you can choose the right product according to the place where it is placed.
Additional information about the product.
Check whether the power cord, manual, warranty card and certificate attached to the product are complete.
Services from merchants.
Including pre-sales service, in-sales service and after-sales service. , from the guidance and suggestions given by the merchants when purchasing products; From the return visit service in the process of product use, from the product quality assurance, warranty period, how to provide relevant after-sales service and so on.