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| JBC Soldering Station CD-2BC - Complete Schematic & Analysis |
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| TheSchilk:
Looking at the schematic again, if there are 245 tips with a series TC, they must have the TC and COM pin shorted internally, otherwise how would the Heater current return through the TC pin? |
| Hydron:
I think the diagram of the cartridge in the OP's schematic is slightly wrong (or possibly can be right but isn't always!), as I have measured a few C245s and they seemed to have a series TC, as shown in the diagram in this other thread: https://www.eevblog.com/forum/projects/yet-another-controller-for-jbc-t210t245/msg3077826/#msg3077826 Similar to the OP's station, my JBC BT-2BWA also only uses the "TC" connection (C1 on the other diagram) for sensing, no substation current flows through it. I just posted a bit more explanation of the operation of this station in that thread. |
| johnmx:
--- Quote from: TheSchilk on June 22, 2020, 06:47:53 pm ---Looking at the schematic again, if there are 245 tips with a series TC, they must have the TC and COM pin shorted internally, otherwise how would the Heater current return through the TC pin? --- End quote --- I have more than ten C245 tips, but I only measured a couple of them. I believe they are all exactly like the schematic I posted in the first post. Do you have any complete model number of such C245 tip with the TC in series? --- Quote from: TheSchilk on June 22, 2020, 06:43:34 pm ---It would make sense on a station that supports the c210 handle because that handle (again, according to SparkyBG) always uses a series TC. Am i right that the station you reverse engineered only supports the c245 handle? :-// all just speculation thought. --- End quote --- The station model CD-2BC only supports the T245 Handpiece and the C245 cartridges. I give up on making the controller for the T245 handpiece. Instead I bought a new BT-2BWA for 190€. With the time required to implement such controller I can easily earn many times more than that. |
| Hydron:
I measured half a dozen C245 tips and none had a thermocouple voltage present between TC and LOAD (it _was_ present between TC and COM). Note that the thermocouple voltage isn't very large - heating the tip up by hand only gives a few microvolts change. This suggests that the attachment point of the heater resistance in the diagram is incorrect, at least in some cases. The thermocouple junction is definitely between TC and COM in all cases (in both C210 and C245). It doesn't really matter however; when measuring the temperature TC and COM are used, which works regardless of where the attachment is and whether the heater current passes through the thermocouple junction or not. As for T210/C210 compatibility, both the BT-2BWA and the CD-2BC support the T210/C210 in addition to the T245/C245 (it's stated in the manual). |
| johnmx:
--- Quote from: Hydron on June 23, 2020, 10:29:08 am ---This suggests that the attachment point of the heater resistance in the diagram is incorrect, at least in some cases. --- End quote --- Which diagram are you referring? --- Quote from: Hydron on June 23, 2020, 10:29:08 am ---As for T210/C210 compatibility, both the BT-2BWA and the CD-2BC support the T210/C210 in addition to the T245/C245 (it's stated in the manual). --- End quote --- Yes, you're right. My previous statement was based only on the product page. |
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