In that case, most likely you have a bad controller or bad programming than a bad U16 - firmware in the calibration menu correctly detects the tool, but it does not work properly.
@minkok Thanks a lot for your help, this did the trick. Erased the firmware and reloaded the latest version. It now works like a charm
In that case, most likely you have a bad controller or bad programming than a bad U16 - firmware in the calibration menu correctly detects the tool, but it does not work properly. You can try deep cleaning of the boards and T245 soldering connector also.
Thanks, will play with the firmware. Probably only will have time the coming weekend. Will anyhow keep you posted on my progress (or lack of it).
Can you Please check also that: Connect T245 without a cartridge you should get JBC t245 recognized and the message "Heater Open"
Didn't play with the firmware yet. With or without cartridge makes no difference. Error message "No Tool". Connections to the cartridge were checked before. Can even see the TC change when the carttridge tip is heated with another soldering iron.
Do not forget, you have to check ( resolder ) on the controller another 5 pins ( 5 different signals ) connected to U16
Bad luck, resoldered all connections to U16 (and U16 connections on the controller). Verified whether all connections were ok with the probes on the chip pins. No bad connections, no shorts and still the same error message "No tool".
Just a pity as, due to the shortage of components, I ordered assembled boards.
So far I couldn't find this IC from reliable suppliers (all out of stock till at least mid next year). See it offered on Aliexpress though. Will always be the question whether these are original Analog Devices parts. Anyhow have no other choice and will have to give it a try. Thanks for all the help. Will feedback in a few weeks when the replacement is in.
Now go to repair: Check, resolder with iron ( not with hot air ) all pins on U16 and corresponding 5 pins on the controller. Check for -0.6V if present U16/5p. If it doesn't help replace it. And of course, please share the result.
Thanks, will only have time later today. Will keep my fingers crossed it just is a soldering issue, though on visual inspection with magnifying glass connections look fine. Supply of 3.3V and -06V anyhow is present on the chip. In case I have to replace the chip it will take some time, haven't found any store/wholesaler with stock. So if needed I may have to order at Aliexpress. Will keep you all posted
For the original JBC t245 the connections are ok. Can you take another measurement? Use calibration resistor, on calibrated RC2 read the Voltages at C65 - my value is 90mV, and at C62 - my value is 1.1V They will be not the same, because my board is compensated ( a bit changed ), but need to be close to them for the calibration to pass.
Measured with a multimeter (DC) in calibration mode: U C62= 1.4V V U C65= 0.1 V Verified with a scope, the signals are just DC levels
In normal operation mode measured with multimeter: U C62= 85 mV U C65= 7.1 mV With scope the signals are pulsed, pulse width about 600us, period time about 9.5 ms. Peak values: U C62= 1.4 V U C65= 100 mV
U11:1= 4.7 mV both in calibration as well as with the C245 handle.
Diodes D18 and 19 seem fine, verified in circuit with multimeter.
Hi, First I want to be sure you connect the handle correctly, just confirm it is as on the picture attached. You use the original JBC handle or for the china one, you connect the right way ( colors are different ). Please check some Voltages at some points for calibrated RC2: U13A:1 106mV U17:3 53mV U17:6 1.5V Tell us, how do they change when you turn RC2? The display is ok, I use similar,
I have an orginal JBC handle with an orginal tip. Connections are as follows: Red is connected to Vout1- and SenseA Blue is connected to Vout1+ Green is connected to SenseB Right now no earth is connected, did have an earth connection before but made no difference.
The more exciting numbers: U13A:1 1.5 mV ranges from 1.4 - 1.6 mV from both extremes on Rc2 U17:3 1.2 mV doesn't really change when adjusting Rc2 U17:6 6.6 mV ranges from 5.8 to 8 mV when adjusting Rc2
When unplugging the handle teh values change a bit: U13A:1 207 mV U17:3 106 mV U17:6 238 mV So it seems something really is wrong with these values. Visual inspection doesn't show any poor connections or shorts Though connections of Vout1+ etc were verified a couple of times, I did it again for the xth time on all connections to the handle plug.
I don't have 5.2C board, I am still on the old board and CPU, but they are near the same except the firmware. You need to take a short video ( picture ) of the calibr. menu. When you connect the 245 handle with the cartridge and turn the aligning poth. RC2, is the temperature changes? You need to check some stuff: Correct connecting Sense A and Sense B. 3V at Vref and -0.6V at the OpAmps pins and the rest of supply voltages at the time of work. If possible check the board with smaller than 2.42" LCD
Thanks for your support. Double checked all connections to the handle one more time, all are correct. Sypply voltages of 12V, 3.3V, -0.6V and Vref are correct. When in calibration menu I can adjust the R and ADC value by changing the potmeter. Works both on SenseA and B (pressing the menu button for 2 sec). The CJTemp of -273 on the Intrument Info screen is not changing at all. Have a 1.54" OLED display with 7 pin SPI interface (SSD1309). The only smaller dispkayy I have unfortunately only has IIC interface. Any signal forms worthwhile to verify with an oscilloscope?
Running into a problem with the assembly, have the message "no tool" (board 5.2C) Using the T245 tip. Calibration works fine. Tip ID is 1805, so also seems fine. The info screen gives CJTemp -273 and Room 22. The tip is not heating. When heating the tip with an external source the -273 is not changing. As the value is -273 it seems the tip is seen at the absolute 0 K. Just wonder where best to search for the short, O/C or even defect.
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