Hello,
Does anybody have schematics for JCD 908S 220V 80W adjustable soldering iron ?
Mine lately stopped working, nothing is being displayed on the screen.
I was using it normally the day before, the next day, it just didn't work.
No component seems to be blown.
The heater resistance is around 140 ohms, measured off-circuit, is this value normal ?
On the board, there's an MCU, the MS51FB9AE by nuvoTon (the company is new to me), but pin 7 (Vss) is only connected to a capacitor, I couldn't find where it also leads!
There is also an invisible burnt trace which should connect the gate of a gate-sensitive triac (BT136) to the MCU.
The weird thing is that the MCU's VDD pin is fed from a voltage divider coming from the mains line, despite the existence of a voltage regulator (XC6206) on the board.
Thank you in advance,
Roger
Does anybody have schematics for JCD 908S 220V 80W adjustable soldering iron ?
Mine lately stopped working, nothing is being displayed on the screen.
I was using it normally the day before, the next day, it just didn't work.
No component seems to be blown.
The heater resistance is around 140 ohms, measured off-circuit, is this value normal ?
On the board, there's an MCU, the MS51FB9AE by nuvoTon (the company is new to me), but pin 7 (Vss) is only connected to a capacitor, I couldn't find where it also leads!
There is also an invisible burnt trace which should connect the gate of a gate-sensitive triac (BT136) to the MCU.
The weird thing is that the MCU's VDD pin is fed from a voltage divider coming from the mains line, despite the existence of a voltage regulator (XC6206) on the board.
Thank you in advance,
Roger
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