1. If the printer can print, but cannot print the specified content, and the printer appears with "@ @ @ @..." or other characters, and similar faults occur during self check printing, it is mostly due to damage to the interface circuit. The interface chips of new printers are mostly not directly soldered, but installed using integrated circuit sockets, so it is not too difficult to replace them. For older printers, when installing integrated circuits, an integrated circuit socket can be soldered to facilitate maintenance. 2. There is a malfunction in the driving part of the character car motor. After the character car returns to the left end (some printers are on the right end), the paper feeding motor can only be turned from driving the paper feeding mechanism to driving the inkjet cleaning system and automatic paper feeder. When the character car motor drive fails, the character car cannot move to the nozzle cleaning unit to execute the cleaning program normally. Check and repair the car motor and its driving circuit. 3. Abnormal operation of the paper feeding motor. Due to the power transmission of the cleaning unit in the inkjet head through the paper feeding motor, when the motor malfunctions, the inkjet head cleaning system is naturally affected. Check and repair the paper feeding motor. If necessary, the motor should be replaced. 4. The failure of the main control circuit board must be determined based on the inspection results to replace or repair the main control circuit board
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China