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JBC Soldering Station CD-2BC - Complete Schematic & Analysis

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Jane:

Anyone knows how much JBC CD-2SQE is different ? How much info from this thread can be used with JBC CD-2SQE?

RichardSim:
Very interesting - thank you for doing this!

I believe this thread (and all other threads I've found online for that matter) has missed one important part of the schematic with regards to T210/C210 compatibility.


--- Quote from: johnmx on June 28, 2019, 02:57:53 pm ---Analog switches controls what signals feed the differential amplifier. When SW1 and SW2 are ‘0’, T_TIP represents the temperature by measuring the small voltage between TC and COM. The circuit is at this state most of the time. One time during power up and one more when the handle is connected, the circuit changes SW2 to ‘1’ during 30 ms. At this point, both inputs are connected to TC. Maybe this is used to see the offset of the amplifiers. Sometimes, especially when the tip temperature decreases, SW1 goes to ‘1’ for 300 us up to 8 ms. Now the amplifiers are measuring between LOAD and COM, this is the voltage drop at the heater.

--- End quote ---
The one remaining combination is LOAD + TC when SW1 and SW2 are both 1. I believe this will be used for T210 handles as the cartridges are wired differently (LOAD and COM are swapped), so you likely didn't run into it with your testing with a T245 handle. This is fascinating, as in other threads (and earlier in this thread) the general wisdom is that for C210 cartridges the heater and TC have no common tap between them, so every open source JBC T210/C210 controller I've found is powering the heater through the TC (and likewise measuring the TC through the heater)!

Here's a diagram I found in the Unisolder thread over at the Dangerous Prototypes forum. Of note is that the T210/C210 connections do not match anything else that I've found online, however they fit the circuit here as I've described, and more importantly all my C210 cartridges appear to corroberate it. Having said that, I haven't actually hooked the cartridges up to a TC amplifier yet to be able to measure it.

dungo:
Hi. I appreciate the work you did in making this diagram. It helped me a lot to repair a JBC that I got badly damaged by a short circuit. managed to repair it almost completely. I only miss the part of the PTC in which you have doubts if it is 33k. actually when looking at your diagram I saw that a 2.2k thermistor is needed to form the voltage divider and thus be able to lower the voltage to approximately 2.5v. as this jbc they removed the thermistor from the transformer and I did not find the 2.2k thermistor just put a resistor of that value. I know it is not ideal but I do not have the correct part. apparently everything works perfectly. Thanks again for your contribution.

Laidukas:
Hello everyone, I would like to buy NT115 nano handle and connect it according T210 pinout, but concern is that T210 is 40W and NT115 is 14W. Does base-unit/controller actively control delivered power to the tip? and consequently will fry the heating element of NT115? Or is it the "Keep It Simple" design where power draw is determined by heating element resistance and I can connect lower wattage tip with no worries?

thm_w:

--- Quote from: Laidukas on May 28, 2021, 09:52:40 pm ---Hello everyone, I would like to buy NT115 nano handle and connect it according T210 pinout, but concern is that T210 is 40W and NT115 is 14W. Does base-unit/controller actively control delivered power to the tip? and consequently will fry the heating element of NT115? Or is it the "Keep It Simple" design where power draw is determined by heating element resistance and I can connect lower wattage tip with no worries?

--- End quote ---

You can find some explanation here: https://github.com/Winkelkatze/jbc_nano_solder

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