KSGER SMD Rework station ERROR

[locutus]

I purchased a KSGER SMD hot air rework station from Banggood, unfortunately, the assembled version wasn't in stock after ordering so I ordered the DIY version. How hard could it be to assemble? Well with some documentation it should have been easy but none was provided. Youtube helped me to identify the wiring of the hot air handle but the display is just throwing error on the screen. I can control the fan speed but the heating will not go on. There is no power to the POUT of the hot air handle. When I press the push button in the back the station will stated POWER DOWN but the fan keeps on running.

Does anyone have any ideas where to go from here?




The RED LED turns off when I take the handle out of the holder. The display will then show ! instead of a thermometer next to the temperature. The temp also reads differently

[floobydust]

You have to ask the seller for documentation (URL). I don't know much about this KSGER hot air rework station, but I would suspect the thermocouple temperature is appearing high or at full-scale and red LED D5 should not be lit up, check the wiring to the handle - it connects to the thermocouple and doesn't indicate the cradle switch.
Connector COUT has thermocouple, one or two switches (cradle reed switch and something else on other models) and GND.
The handle wiring might be:
BRN - Heater
ORG - Heater
GRN - PE GND heater collar
BLK - Fan DC (-)
BLUE - Fan DC (+)
RED - Thermocouple (+)
YEL - SIGNAL GND (for TC, reed switch)
WHT - Cradle reed switch(s)

[locutus]

Thank you! This confirms my own measurements, unfortunately I still have the error on screen. Banggood has not sent me any information. I created a video to demonstrate the issue for them. Hopefully they can support me but I'm not sure they'll be able to.

https://youtu.be/5cWMZs2BfuI

[floobydust]

The red LED should not be lit, so either the thermocouple wiring is wrong, or the op-amp is bad.
"Cold END" should be set to CPU not NTC because you don't have the CJC NTC.

[locutus]

The red LED should not be lit, so either the thermocouple wiring is wrong, or the op-amp is bad.
"Cold END" should be set to CPU not NTC because you don't have the CJC NTC.

So I found this and the thermistor is included, it is however totally unclear from where to where it connects. I think left is coming from the reed switch and right is ground. I tried many combinations but it doesn't fix the ERROR on screen. Also no battery was included, could that cause the ERROR message?


Still, I regret buying this now knowing it would be missing any form of instruction. I created a ticket asking for either a refund or a replacement.

[floobydust]

Your connector COUT is missing the extra 4th pin, the thermistor is for cold-junction "cold end" temperature correction, I'm not sure what you're going to achieve if the wire for it is missing. But it's not really needed anyhow - in the menu you can select NTC or use the MCU's temperature, either way it should display around room temp.

The error is the thermocouple is pegged, double check the wiring from R13 to the connector to the handle, something is not right there. The red LED should not be lit.

[locutus]

So could it be my magnetic switch in the handle is broken? I've seen it work once and then no more. If the reed switch is always connected as if the magnet is present this could cause no power to the heater.

[floobydust]

I would say you'll have to draw a wiring diagram of the wand and the GX connectors. The thermocouple wire ends up crossed with something else, so the controller sees max temperature all the time. Be careful too because there is mains and you don't want that mixed up with the low voltage stuff.
The reed-switch is closed by the magnet when in the cradle and grounds that digital input.

[sam36]

Hi,

I know it has been a year, but I had the exact same problem and solved using various online resources including this. Hope that helps if someone has the same problem.

Core of the problem is: Mismatch between the handle wiring and the board.

The "COUT" connector is from left to right (also written on the other side of the board for me):

• T: Tip of the the blower (one side, the other being grounded)
• G: Ground
• N: NTC (one side, the other being grounded)
• S: Reed switch (one side, the other being grounded)

That does not match the internal wiring of the handle, plus the NTC comes separately in a little bag. To make it work, you need to open the handle, and re-wire it.
You do not need to rewire:

• Fan motor (2 wires)
• Heating element AC (2wires)

The other four must be rewired so you got:

• One wire (yellow in my case) going to one of the small wires going in the heating element. That goes to the T of the COUT connector
• One wire (green in my case) connected to
  • Ground of the heating element
  • One side of the reed(s) switch(s)
  • One side of the tip (second small wire going into the heating element)
  • One side of NTC (little component coming separately in the bag)
  That goes to the G of the COUT connector
• One wire (red in my case) connected to one side of the NTC
  • One wire (white) connected to the other side of the reed(s) switche(s)
    
  
  Here is a schematic taken from this video: that could be of some help:
  
  
  Picture of my modified handle:
  

[CasualAndy]

In addition to the other pictures, here are some that I made while upgrading the rework station.
My wand fan broke and thus provided no cooling for the heating element, which melted the wand...
Before:

After: