Hakko desoldering gun help

[RepairNewbie47]

Hi all new here great forum !

Ok so my issue is slightly different to the norm probably .

I have a Hakko 900c soldering station with a iron and a desoldering gun , the gun is completely destroyed which is a shame , however someone gave me a gun from a duratool ZD-915 and ZD-917 machine which is very similar looking , not as durable I dont think as the old Hakko but my question is , would it work and how should I go about wiring it ? I no longer have the Hakko one for a reference which I`m kicking myself about so thats a pain . The Cheapo one has 6 pins and the hakko has 5 so I`m thinking thats a non starter there but I thought I would ask the experts in here how to go about trying to make it work . I would LOVE to have it running again , when it was working (about 10 years ago) it was fantastic. They are both 24v I believe (the iron and the new gun are , I havent checked the v`s yet)

TIA

[RepairNewbie47]

Re: Hakko desoldering gun help

Having had a look inside the Hakko now , it seems that it uses only 4 of the pins out of the 5 in the socket , so I can only assume that this is 2 for the element and 2 for the switch (send and return to the pump) , and the temp is controlled but the co-efficiency of the heater itself (as some of them were back then). This is good it means I dont need to worry about the 2 wires on the heating element for the temp sensing I can just go ahead wire the element , and the switch and hopefully we should have a working gun . The gun isnt here yet should arrive tomorrow but I know it has a 4 wire element so thats where I`m at with it . If anyone has any info to throw in here I would greatly appreciate it before I blow something up . My hakko is an amazing Iron I really REALLY dont want to break it ..lol .

[sam_sam_sam]

Re: Hakko desoldering gun help

The ZD-915 Desoldering gun may not have the same type of temp sensor as a Hakko

The heating element is the heavier set of wire the thinner set of wires are the temperature sensor on the ZD-915 gun

[RepairNewbie47]

Re: Hakko desoldering gun help

cheers thanks for that , i dont think the hakko had a temp sensor at the element , i think it used the difference in resistance at the coil its self to determine the temp (coefficient temperature resistance) so i think i can just ignore the temp sensing wires and use the heating element . Should know tomorrow , thanks for your help.

[redwire]

Re: Hakko desoldering gun help

I know the Hakko 470, 471, 472 temperature controllers use the heater's resistance as a measure of temperature. It monitors heater current for feedback of temperature.

Be careful, if your temperature controller thinks the heating element is cold (lower resistance/higher current) than expected, it can go into thermal runaway and overheat, even with the temperature dialed way down.

[stj]

Re: Hakko desoldering gun help

the Zong-Di handpiece uses a thermocouple,
i will post the pinouts later - i worked them out to make my own base from a fucked weller!

[stj]

Re: Hakko desoldering gun help

1 - black (thermocouple)
2 - blue (thermocouple)
3 - red (heater)
4 - red (heater)
5 - white (switch)
6 - white (switch)
shell - earth(yellow)

[RepairNewbie47]

Re: Hakko desoldering gun help

1 - black (thermocouple)
2 - blue (thermocouple)
3 - red (heater)
4 - red (heater)
5 - white (switch)
6 - white (switch)
shell - earth(yellow)

awesome , many thanks mate , this is going to help no end .

[RepairNewbie47]

Re: Hakko desoldering gun help

I know the Hakko 470, 471, 472 temperature controllers use the heater's resistance as a measure of temperature. It monitors heater current for feedback of temperature.

Be careful, if your temperature controller thinks the heating element is cold (lower resistance/higher current) than expected, it can go into thermal runaway and overheat, even with the temperature dialed way down.

thanks for that i`ll bear that in mind when i fire it up for the first time , cheers.

[sam_sam_sam]

Re: Hakko desoldering gun help

the Zong-Di handpiece uses a thermocouple,
i will post the pinouts later - i worked them out to make my own base from a fucked weller!

How well dose your conversion weller base with a ZD-915 gun work

[stj]

Re: Hakko desoldering gun help

not done yet.
soon, just waiting for delivery of a couple of used iron bases from a friend.
a ZD with lcd disp and a solomon with led readout.

hoping to use the controller from one because they use a thermocouple.
the original weller base used a thermister and was just a pot and led - i'm not using that!

my build list so far:
zong-di handpiece,
weller case, transformer & pump
extra air filter - https://www.banggood.com/5X-Universa...-p-913243.html
and "new" control board as mentioned.

once it works, i may build this for it!!!
https://manolena.wordpress.com/2015/...tion-with-avr/

[sam_sam_sam]

Re: Hakko desoldering gun help

Keep us posted with your progress with this project

[trantony34]

Re: Hakko desoldering gun help

ủng hộ mọi người ơi @@

[RepairNewbie47]

Re: Hakko desoldering gun help

OK so , here`s what we have , (see images)

There are 3 active wires + earth at the plug do I ASSUME that there is heater + heater - and a pump - which connects to the - side of the heater when you pull the trigger . Does that sound plausable to you guys ?

The wires are - black - +v/H on the board
- Red - -v on the board (believed to be pump -)
- White - H On the board

Dave

[stj]

Re: Hakko desoldering gun help

so 4 wires,
and you need at a minimum,
0v
element +
sensor +
switch return

do you have the broken original handpiece?

[stj]

Re: Hakko desoldering gun help

btw, there are 2 other ways of sensing temp.
one is to put a thermocouple inline with the element - but i dont think that crude controller could handle that.
the other is as you said - to calculate the change of element impedence.
but that is also a bit complex.

i *hope* you have an old handpiece.

[RepairNewbie47]

Re: Hakko desoldering gun help

No i dont have an old gun , That went a long time ago . I`ve had this unit getting on 25 years . So i wired the new gun to H and H on the board it heats up ok , problem is it doesnt stop heating up . to the point it glows , at which point a "oh shit" popped out and I shut it down . So its no sensing the temp for sure .

[RepairNewbie47]

Re: Hakko desoldering gun help

BTW one of those wires is Grounded to the case .

[stj]

Re: Hakko desoldering gun help

solved.
wiring diagram is in here:

to be blunt, i would be looking to replace the controller.
also, try not to use both irons together.
the original desoldering head was 60w and the zong-di is about 80w
i dont know how much extra the transformer can output.

[stj]

Re: Hakko desoldering gun help

one other thing,
the zong-di has thin switch wires - put a solid-state relay in the base for pump switching.