HQ SMD Rework station soldering iron repair

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

i fix that, but back on begining. No heating unless i put aditional 50ohm resistor between sensor.

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

so i have 58ohm from sensor and station wont start heating. But when i add 50 ohm i get total of 28-29 ohm, and it is heating. why is that?

[stj]

Re: HQ SMD Rework station soldering iron repair

what chips are on the board?
i had a bad hot air unit like your station, it had a lm386 i think it was - green corosion on the legs!
it also had a 555 timer with green crap on the legs too!

you need to see what amplifier chip is linked to the sensor.

[rievax_60]

Re: HQ SMD Rework station soldering iron repair

I can add to the confusion. There are 2 basic types of heaters used in Hakko clones. One is actually the original Hakko heater which has a 50ohm PTC thermistor.
The other is a Chinese made heater that has a thermocouple. It must be a type K because when I connect my Fluke 87-5 to it on temperature range, I get an accurate temperatue reading of the day.
My Aoyue 936A uses the original Hakko type heater.
With the hand piece unplugged, I measure 6V at the socket pin holes for the thermistor.
If a station needs the Chinese type heater with thermocouple, I would expect to measure no voltage.
Tell us a lot about the PCB so we might figure it out.

[rievax_60]

Re: HQ SMD Rework station soldering iron repair

This is a schematic for a thermocouple type station. http://s020.**********/i706/1304/f7/f05b997dbf33.jpg
Actually there will be some voltage at its input. See how well this schematic matches your station. Look for the TL431 first.

[stj]

Re: HQ SMD Rework station soldering iron repair

i suspect it's using a ptc,
but either way, i'd try replacing any op-amps.
and inspect the entire board too - after seeing in mine, i would never trust one of these Aoyue type units without a full inspection!

[stj]

Re: HQ SMD Rework station soldering iron repair

@rtstorm.
can you post good foto's of the pcb(s)

if your station isnt digital, you could upgrade the controller btw.
http://dangerousprototypes.com/forum...hp?f=19&t=3475

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

here it is

the IC is LM358.

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

@rtstorm.
can you post good foto's of the pcb(s)

if your station isnt digital, you could upgrade the controller btw.
http://dangerousprototypes.com/forum...hp?f=19&t=3475

i woud love to upgrade but where can i make PCB

[stj]

Re: HQ SMD Rework station soldering iron repair

they sell it
http://www.seeedstudio.com/depot/ope...html?cPath=174

or use stripboard!

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

ok thanks, but i cannot find the part list for this board. do the sell whole board ready to use or just PCB? I will first like to see part list to check if i can find all of them.

[stj]

Re: HQ SMD Rework station soldering iron repair

it was all in the first link.
http://dangerousprototypes.com/docs/...v1_development

http://dangerousprototypes.com/docs/...ng_Iron_Driver

the microcontroller is easy to program,
and i'm sure you can source an lcd display from some junk like a fax machine.
or ebay one from china.

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

well i almost build it. Will post after i finished.

[rtstorm]

Re: HQ SMD Rework station soldering iron repair

Almost done

[stj]

Re: HQ SMD Rework station soldering iron repair

that's nice.
the only thing i would have done different is use connectors instead of screw terminals.

are you going with the "buttons" version or the "rotary encoder" version software ?

[keeney123]

Re: HQ SMD Rework station soldering iron repair

I do not know if this is your particular model number Hakko 936 but here are schematics, component layout and parts list. With troubleshooting procedures.

[keeney123]

Re: HQ SMD Rework station soldering iron repair

Sorry did not see second page.

[stj]

Re: HQ SMD Rework station soldering iron repair

Sorry did not see second page.

yes, it is going through "evolution"