Hi there everyone. I have bought two Velleman K8060's and have a problem with one of them. If I switch on the power, all seems ok. I measured the supply voltages (reads +/- 44V), adjust the bias voltage over R19. As soon as I connect the speakers and adjust the volume pot, the power transistors T8 and T7 blows up. I tried to put in a series resistor of 330R between D1 and T6, still the same problem. I changed the 47K Pot to a 10K Pot to see what will happen, but still the same problem. I replaced all resistors and transistors, but T8 and T7 still blows up. What can I do to solve this problem? Please reply to my email address: [email protected]

I would trace the power that is missing back towards the fuse box and body control module.
Check the OBD codes.

No, Huawei S5700 series PoE switch only has AC power supply.

Something's REALLY wrong. Send me the schematic, and I'll look at it and TRY to help you.

To check the current, you'll have to set up your equipment to the mA (milliamp) position. It's located on the right side of the equipment, on the "A" section. The test leads should be positioned accordingly and it is: black in the middle connector (common) and red on the right connector (mA).
It's safe to start measuring the current in a higher scale. Safe for the equipment. So start measuring with the equipment set to the 10A scale and the red test lead on the left connector (which reads 10ADC or so) and check the reading to see if it's below 0.2A, which is the same equivalent of 200mA. If it is, then it is safe to start reading the milliamp (mA). Undo the leads to the mA port and change the equipment scale to 200mA. If you don't observe this and you try read a current higher than 200mA, your equipment might burnout.
But wait: to measure current, you have to open up the circuit that you pretend to do the reading. You can only measure voltage (not current) with the circuit "closed" (also be careful to not try to measure voltage while the equipment is set to measure Amps. Leads will meltdown!!).
To do this, remove one of the batteries terminal. Doesn't matter if it is positive or negative. Then, with the equipment already set to the scale you want, connect one lead to the terminal and the other to the cable or wire that you just disconnected. This will provide continuance of the circuit, having the current going through the DVM and displaying the actual current through that circuit.

Call a1sewingmachines.com
518)469-5133

and ask them about the manual

hi...
transistors are not ok on the C160 module.
replace all the power transistors and emitter resistors for that channel.
www.bdent.com and www.ceitron.com are good for transistors

1. Verify wire harness connections to inlet valves, pressure switch, flow meter, and Central Control Unit (CCU).
2. Check all hoses for possible leaks.
3. Plug in washer or reconnect power.
4. Verify pressure switch operation.
5. Verify flow meter operation by blowing air through the part and measuring the resistance.
6. Verify CCU operation by running a Diagnostic test or any wash cycle.

5 & 6 above are the most likely culprits.

Rather than modifying the unit (which may not be possible), you should be able to locate a voltage transformer that will convert the 110 into 240. Many of these types of units utilize different power transformers depending upon the source voltage. If you'd rather not use an external transformer, request a source voltage change kit from Velleman. If they utilize different parts, the required parts will be included in the kit.

Dan

did you measure 60vac across total secondary or 60vac from center tap?

You will need your model #
Here is where to get your manual

http://www.dewaltservicenet.com/

Good luck and let me know if I helped