¤Ÿ [1]8250 no signal after the machine into the water.XQ7service manual download site
A 8250 water machine no signal, disassemble the machine found the antenna switch has been replaced and took off a couple of feet, determined in another shop this machine fixed. So the first line test machine, no network signal. Description receiver circuit has a problem. Because it is water into the machine, down bigger and suspected IC cold solder joint, so replanting frequency, the Audio IC, the fault still, welding all of the receive path, still exists. The "search network" prompted for more than 10 seconds before the "no network signal," judge this fault can occur in 13MHz clock circuitry, measuring the supply voltage is 2. 8V power supply, the output frequency is 25. 88888MHz, bias, normal should be 26MHz. Replace the 26MHz Crystal system, can access and also went up in bars, trying properly, troubleshooting.XQ7service manual download site
¤Ÿ [2]3210 machine, "two lines of English".XQ7service manual download site
A 3210 mobile phone, sometimes "two lines of English" can not be used. Does not appear when I use the normal. This is typical of software failures, using "chip repair" software repair, commissioning, much better than the original, but sometimes not working properly, call each other and sometimes without, doubt audio circuit cold solder joint. Take apart the machine, welding after the Audio IC, everything is normal.XQ7service manual download site
¤Ÿ [3]3210 machine display not working properly.XQ7service manual download site
A 3210 mobile phone, display from time to time, sometimes very pale. Teardown for conductive adhesive is not valid, change for a good display after display. Customers come back and back again on the third day, said not showing. Check the display to normal, more welding power supply IC, OK. After a few days the customer took it back again, measurement display voltage sometimes normal and sometimes found abnormal suspected to be a power supply problem, then remove power IC, replanting, to load. Can not open the machine, the current stop at 20mA fixed, power supply broken? Replanting power IC again, or not to boot. Taking into account the power IC is treated, saying it was completely damaged, be replaced, boot normal, display was all right. Is no longer here to our customers, and troubleshooting.

 2    1 2 Next Last