PCBA Tech - Maintenance and inspection of PCBA placement machine

Maintenance and inspection of PCBA placement machine
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In European and American countries, SMT placement machines are maintained daily, monthly maintenance, quarterly maintenance, and large refurbishment a year ago. The purpose is to prevent it from happening, reduce estimates, and improve production efficiency. Therefore, regular inspection and maintenance systems have to be formulated:
1. Check every day
(1) Before turning on the power of the placement machine, check the following items:
1. The temperature is between 20 degree Celsius～26 degree Celsius, and the humidity is between 45～70%.
2. The indoor environment requires clean air and no corrosive gas.
3. Make sure that there is no debris on the transfer rail and within the moving range of the placement head.
4. Check that there is no debris on the fixed camera and whether the lens is clean.
5. Make sure that there is no debris around the nozzle library.
6. Check if the nozzle is dirty and deformed, clean or replace the nozzle.
7. Check whether the tape feeder is correctly placed in the material station, and make sure that there is no debris on the material station.
8. Check the connection of air connectors, air hoses, etc.
(2) After turning on the power of the placement machine, check the following items:
1. After starting the system, check whether the display of the menu screen is normal.

2. After pressing the "Servo" switch, the indicator light should be on, otherwise it will be shut down and restarted.
3. Can the emergency switch work normally?
4. Check whether the placement head can return to the starting point correctly.
5. Check if there is any abnormal noise when the placement head moves.
6. Check whether the negative pressure of the nozzles of all placement heads is within the range.
7. Check whether the PCB runs smoothly on the guide rail and whether the sensor is sensitive.
8. Check whether the edge positioning and needle positioning are correct.

2. Monthly inspection
(1) Clean the screen and floppy drive of the CRT.
(2) When the placement head is moving, make sure that there is no abnormal noise in the X and Y axes.
(3) Make sure that the screws on the cable and cable bracket are not loose.
(4) Make sure that the air connector is not loose.
(5) Check the pipes and connections to make sure that the air hose does not leak.
(6) Make sure that the X and Y motors do not heat up abnormally.
(7) Move the placement head along the positive and negative directions of the X-axis and Y-axis. When the placement head moves out of the normal range, the alarm should sound, and the placement head can stop moving immediately. After the alarm, use the manual operation menu to make sure The loading head can run.
(8) Check whether there are stains on the timing transmission belt and gears to ensure that the placement head can rotate without obstacles and that the placement head has sufficient torque.
(9) Check whether the placement head can move up and down smoothly, push the suction nozzle up with your finger, check whether its movement is smooth, make the placement head move up and down out of the normal range, check whether the alarm can sound and the placement Whether the head can stop immediately.
(10) Ensure that the scanning head can move smoothly.
(11) Check the negative pressure of all placement heads. If the negative pressure value is abnormal, clean the filter in the nozzle shaft. If the filter in the vacuum exhaust pipe is dirty, replace it.
(12) Check the movement of the transmission rail, check the tightness of the conveyor belt, check that there are no smudges, scratches and debris on the conveyor belt, check the automatic width adjustment of the guide rail, check the movement when the maximum width and minimum width are adjusted, in the population At the exit, check the parallelism of the rails and the transmission of the PCB.
(13) Check the movement and noise of the PCB limiter.
(14) Check the wear conditions of the side clamping, rear top block, and buffer stop.
(15) Check whether the fixture on the nozzle magazine is flexible and worn.
(16) Clean the lens and light box of all cameras.
(17) Check the movement and brightness of the camera lighting device.
(18) Check whether all brakes can work normally on the VO signal screen, and check the emergency stop switch.
(19) Make sure that all the warning lights can be on and the installation is firm.
(20) Check whether the hazard alarm and warning alarm can sound. .
(21) Perform "image detection" on the camera.
(22) Check the coordinate value of the pick-up point of the feeder station.
(23) Make sure that the components can be assembled to the designated location.
The above introduces the daily inspection, maintenance and monthly inspection and maintenance work of SMT placement machines. The regular inspection and maintenance system of SMT placement machines must be paid attention to and implemented, not only SMT placement machines, but also in PCB copy/design The machines used in processes such as electronic production and processing must be regularly inspected and maintained, so as to create more wealth for us.