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Hakko 936 clone modification help needed
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rocmel:
Hi all
I have a 936 clone and I want to modify it to take an old Royel CT207 desoldering iron.
 I don't want to build a controller from scratch.
The problem is that the desoldering iron has the heater and sensor internally connected as common.
What mods do I need to make to the 936 board, in order to use it.
amyk:
The 936 and clones run the heater from AC, and rely on the sensor being isolated and being able to drive both halves, so the circuitry won't work with a commoned heater-sensor element.

There's also the question of whether the temperature sensor has suitable characteristics for the 936-style controller; either way, the closest I can think of as a solution is to have an amplifier/level translator that simulates a resistance across the 936 sensor inputs.
wasyoungonce:
I have a few Royel desolder stations and other Royel stations and some 936's.  The Royel is common between the heat and sense.  The Hakko is not.  They also have quite differing sense resistances (at ambient temp). 
CT14 iron is 23/24ohm, 2~3 ohm heat (have seen 7ohm heat),
CT6 iron 23ohm sense 3ohm heat (have seen 8 ohm heat);
Ct200-1M desolder iron 24~29Ohm sense and 3~3.5 ohm heat.....

The Hakko is 2 ohm heat and 50ohm sense (ambient)

I think I have quite a few Royel PCBs on hand.  I replaced some with my own made versions I changed the cal pot it was peeving me off.   The new PCBs hold cal much better. They are in general still +/-10 degrees C at iron tips.  Which is excellent, they were the first Mil Spec soldering systems.  They were excellent but the Royel soldering was sold and fell apart.  Last I heard were selling cheap systems from Vietnam I purchased one to see, they were really bad. Anyway other mfgrs caught up quickly caught and passed them once Wash had left. When they were part of Varian they were a great company.

Anyway I digress....

IMHO...either make some new PCBs to run the royel irons you cannot use a Hakko or clone control.  I have quite a collection of Royel PCBs tip etc.  Despite the Hakko, guess what Solder stations I use all the time?   I have a lot of measured data on their irons and PCBs.   Before I got my desolder station I was going to my my own desolder using their control PCBs.

edit:
gotta say definitely some of the values (and schematic ) on the Royel drawing is quite different to what I have and the layout is odd wrt to mine.  Ive seen 3 variations of Royel PCBs

wasyoungonce:
I also meant to say I have PCBs for the earlier Adcola soldering systems.  These were the precursors to the Royel.  I have a few Adcola irons running on my royel.
rocmel:
The Royel CT207 is from the 80's,  I've tested it and heats & sucks !!!!
Heater is 4 ohms
sensor is 24 ohms
Thinking of getting a T12 mini, modifying the comparator and the back end with a n SCR /triac
there is also a simple controller that seems to work youtube video
I'm not too fussed with temp control accuracy.

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