Kada 852d+ need schematic

[ktmmotocross]

Hello have this hotair and soldering iron station that is not work.
have anybody schematic for it?

[stj]

Re: Kada 852d+ need schematic

what is bad, the iron or the air?
those combo units usually have a different board for each side.

[ktmmotocross]

Re: Kada 852d+ need schematic

i allready modified this station wirh my own regulators to use only hot air because its iron is total crap

but u know i want to learn so i want to repair this board

i dont measure anything, because i want to first find schematic, if it is awailable

on picture "SNIM" is marked sensors connectors and "ZHAV" is marked heating elements connectors

[stj]

Re: Kada 852d+ need schematic

if it's similar to the 858d then start with these.

[ktmmotocross]

Re: Kada 852d+ need schematic

totally different, but its just one layer board so i can easy trace

make some measurement and give feedback

[ktmmotocross]

Re: Kada 852d+ need schematic

i realize there is triac missing so i replace it, but now i must measure resistance of temp sensor in heatgun to attach some resistor for testing

do u think i can replace BTA08-600C with BT139-800 ?

BTA08 - is 8A and trigger current 5-50mA

BT139 - is 16A but trigger current is 5-10mA which im afraid of

[stj]

Re: Kada 852d+ need schematic

139 is better.

btw, most soldering gear sensors are thermocouples, not resistors.
they look like a short-circuit and generate a variable voltage that rises with temperature.

[ktmmotocross]

Re: Kada 852d+ need schematic

139 is better.

btw, most soldering gear sensors are thermocouples, not resistors.
they look like a short-circuit and generate a variable voltage that rises with temperature.

damn thats bad. there are voltages with temps marked on board but dont know if it is for hotair or iron

[ktmmotocross]

Re: Kada 852d+ need schematic

measure hotair and there are resistive sensor

so my test resistor would be 30-40ohm

[ktmmotocross]

Re: Kada 852d+ need schematic

Have anybody this station?

can u please photo its connectors? there are many same connectors and i dont know what goes where. so please upload me photo

[ktmmotocross]

Re: Kada 852d+ need schematic

and please one photo of secondary windings of transformer, because i found one wire disconnected

[stj]

Re: Kada 852d+ need schematic

the transformer is usually 24v and 9v secondary's

[ktmmotocross]

Re: Kada 852d+ need schematic

the transformer is usually 24v and 9v secondary's

i think i have 24V and 10V/its marked on board/, but i have there three windings.

one 24V i think because of thicker wire/iron power/ and two with thinner wire connected in the middle - see picture. dont know why it is the second thinner winding with loose wire

there is only 3 connection pads so maybe it is two 5V winding connected together to give 10V

that 1st picture have bad marks/yellow/ because 2x5V winding come in mind later

[ktmmotocross]

Re: Kada 852d+ need schematic

now i really dont know what to think about this chinese crap station

look at the picture with measurements

[stj]

Re: Kada 852d+ need schematic

15v to rectify and drop to 12v/5v for the logic, 24vac for the iron.
2v probably not used here - but handy to drive VFD heaters!

is that original?? every station iv seen inside had wires coming out - no solder tabs.

[ktmmotocross]

Re: Kada 852d+ need schematic

must open station and cut whole cables to get out connectors and find out what is going where.

i connect 10V to connector marked 1/10V which i think is for logic and 24V to connector marked 24V for iron heater

dont know why this chinas engineer marked +/- on resistive sensor, and 24V IN/GND when it is AC voltage

and i forgot that this station dont have main switch so transformer is still working

looks like everything is working but dont have voltage on heating for hotair heater.
maybe it is because of my sensor replaced by resistorand test load is bulb, so i connect it right to the station.

but i will test it at the morning

[stj]

Re: Kada 852d+ need schematic

what are you doing???

the soldering iron is 24v,
the hot air is usually mains powered.

[ktmmotocross]

Re: Kada 852d+ need schematic

what are you doing???

the soldering iron is 24v,
the hot air is usually mains powered.

that's exactly how i connected it. did u read something else from my post?

looks like it is working. compressor is regulated, and sensor circuit works because when i turn of heater, compessor still works until sensor is cooled.

But air heater is still on. i think that is something bad in regulation of it, because driver/MOC3023/ have still 1.16V between pins 1 and 2

[stj]

Re: Kada 852d+ need schematic

on my old one (no microcontroller) there was an opamp.

[ktmmotocross]

Re: Kada 852d+ need schematic

and looks like we have a winner

i take MOC3023 from iron heater and solder it to hotair heater and looks like its working.

now i put everything to station and give a final test