44
5.2.3.Placement failure analysis and troubleshooting
Placement failure analysis
Whether Pick and Place machine can run normally or not, which will directly impact on
production quality and volume. To make the machine run properly, we must fully understand the
structure and characteristics of the machine, master every kinds of failure
patterns of manifestation,reason and troubleshooting methods. Finding problems and reasons in
time and timely troubleshooting can help ensure efficiency of the machine during working.
（
1
）
Common failures
boot failure
head doesn’t move
fail to feed forward a board
Pick failure
Place failure
（
2
）
Main reasons of failure
transmission systems-driven PCB and head movement transmission system and the
corresponding sensors.
Air Route-Air pipe,nozzle
Nozzle size not suit to the component
No info in Footprint library
Irregular component
Incorrect values setting of component’s height or pick height
（
3
）
placement troubleshooting
failure patterns of manifestation,Reasons,troubleshooting methods
head doesn’t move
Solutions:
1.
Sensor is poor connected or short-circuited. Please wipe off the dust or lubrication
on
sensor or even exchange a sensor
2.
Longitudinal sensor or sensor poor connect or short circuit, check and repair the transmitter
or add too much lubricating oil on sensor-clean the sensor
Rails fail to advance the board feed forward after uploading the PCB
Solutions:
3.
The rails belt get loose or broken, need to be adjusted or exchanged.
4.
The rails drive motor doesn’t work.
Nozzle can’t pick up component
Pick up position offset
Components fall down during moving
Solutions:
1.
Nozzle had been wearing or become aging,the crack causes leakage,replace with a new
nozzle
2.
The nozzle’s bottom surface is uneven or get suck by solder paste or other dirt.Please wipe it
