308Duo Error 2001 Help Needed
 

I'm troubleshooting an iCharger 308 Duo. It was working fine for charging purposes, but when attempting to use a discharger bank on the right channel, it quit working, displaying "Error 2001: Output Channel Broken", and that side no longer works for charging.I did notice it makes my power supply click just before it errors out, thought it was a fan noise, but I don't get that same noise with my other charger (406 duo).

Video of the symptom here:

+ "iCharger 308 Error 2001" via YouTube

PCB pictures: https://imgur.com/a/Nobrbi4

I cracked it open and checked the following:

1. Output fuses good on both sides
2. No puffed capacitors
3. No exploded or cracked chips that I can see
4. FETs look intact
5. FETs ohm out symmetrically from one side to the other, none are open circuit
6. While there is some discoloration to the board, it looks to be oxidation or just coating distress, not what I would think is heat or arching related, although it is hard to tell with a black PCB.
7. No broken solder joints apparent, but I didn't break out the magnifying glass...

Any thoughts? The internet doesn't show much for this error code that I've found...

Symptoms are similar to what I've seen before, but never got an error. Surprised you didn't find a bad FET. Double check the FETs in this post I made about fixing the 406. Fixing 406duo In my case, the resistor driving the gate of the mosfet was bad. You should check that as well. For the right side mosfet the gate pin is the top pin. Trace that pin and you should find a resistor. Compare it's resistance against the same one on channel 1. I don't remember what it's supposed to be.

Or the driver it self is burned out, the pwm solid state device that switches from charge to discharge.


Block description;

There are typically two resistors,..voltage divider., before the transistor that drives the npn/pnp transistors that drive the mosfet at the gate. There are also typically resistors that drop a specific amount of voltage in line with schematic flow.