HQ SMD Rework station soldering iron repair

[rtstorm]

Hello, i need some help. On my soldering station solder iron died (heater) So i order new one and when i get it it wont work.

So i check it, disassemble it and i cant read the resistance of heater! Am i doing this right?

On pins from the picture i can read 28V AC so i think the heater is dead?

[bukurat]

Re: HQ SMD Rework station soldering iron repair

You should be able to read the resistance of the heater if its intact.
28V seems reasonable for a heater. It first guess I would say its open circuit.

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

yes i order new heater then we will see

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

hello i noticed that i have 28V between red and blue wires. So i think this hakko soldering iron have different wiring.

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

i have check by this link
https://cdn.badcaps-static.com/pdfs/...9e73bfb1cb.pdf

and i have pin 4 and 5 - 3ohm, pin 1 and 2 - 54ohm, and pin 3 and tip - 2 ohm. i measured output from station on pin 4 and 5 i have 3VAC

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

ok i am stuck at this and cannot get this thing to work. I changed heat element and i cannot get 24V on heater. I disasseble the station and i see a crap of soldering. Please tell me how this this work? What shoud be connected to sensor and what to heat element?

[stj]

Re: HQ SMD Rework station soldering iron repair

before you do anything else,
check the cable with a meter to make sure there are no broken wires.

every iron i'v had has eventually needed a new cable/needed a section removed.

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

i did, and this is a new iron. wire is ok

[stj]

Re: HQ SMD Rework station soldering iron repair

a new iron?
are you sure it's wired the same as the old one?

these cheap units keep changing the wiring around, that's probably why you have that mess where the pcb connects to the socket.

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

hmm you think i shoud try to swap sensor and heater wires?

[stj]

Re: HQ SMD Rework station soldering iron repair

no, i'm saying may you should look at how the old one is wired.
btw, the sensor is usually a thermocouple - those have polarity.

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

i do not have old one

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

i notices when i shorted sensor pins the heater instantly go really hot. i think that something is wrong on board.

[stj]

Re: HQ SMD Rework station soldering iron repair

reverse the sensor wires and see what happens.

the sensor normally generates a voltage that rises with temperature on most irons,
although a few use a temperature sensative resistor.

try connecting the sensor to a voltmeter set to read millivolts, then heat the sensor with a lighter.
if you see a rising voltage then it's a thermocouple.

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

when i connect a heater it wont work but when i shorted the sensor wire with 50ohm resistor temp rises. So my guess is that thermocouple if fail. I have 58Ohm on it but function of thermocouple is fail. I try what STJ suggest and i do not have any reading.

[stj]

Re: HQ SMD Rework station soldering iron repair

try heating the sensor with the meter set to read resistance.

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

yep i try the resistance raise when i heat the element, so i think polarity would not have any effect

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

ahh i going crazy, now main filter capacitor i blown every time i turn on soldering.

[stj]

Re: HQ SMD Rework station soldering iron repair

then a rectifier diode is shorted.

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

hmm, i test and it's OK. But now i see that i put 16V cap the voltage of board is 28V AC. I think that is the reason why it was blown