Dear Sir, I bought an Electronic Acupuncture Treatment Instrument SDZ-II this June in Shenzhen Zhonglian Medical Supply Co. At the counter, we tried the power, the switches for frequency and wave. But we did not try to connect the electrode or metal clamp. When I brought back to England, I could not make it to work. After comparing with another machine (same model) in one of the clinic, I found that the six output sockets are all empty. They can not make the connection when plug in either self-adhesive electrodes or metal clamps. Please advise what shall I do? Thanks in advance.