How to clear a conveyor jam on a Heller 1900 / 1936 MK7 reflow oven
Conveyor jams are usually caused by a warped PCB, a worn chain link, or a drive sprocket particle buildup. Stop the machine, cool the zone, and remove the board before inspection.
~45 min8 steps
How to fix reflow profile deviation on a Heller 1900 / 1936 MK7 reflow oven
Profile deviation is usually a failed heating element, a blower motor fault, or a thermocouple out of calibration. Run a profiler board and compare to the baseline before changing set-points.
~90 min8 steps
How to fix solder ball defects from a Heller 1900 / 1936 MK7 reflow oven
Solder balls are usually caused by a ramp rate too high, moisture in the PCB, or solder paste slump from printing to reflow delay. Check the preheat profile and board storage first.
~60 min7 steps