![]() ![]() I found the schematic and tried to calibrate it but the trimmer which is responsible for this is almost fully turned clockwise giving the measurements i described. I connect the probe into the 0.5vcal point and it measures only 0.3Vp-p instead of 0.5Vp-p.The same happens if i try to measure dc voltage from my power supply.For 10 vdc it reads about 7.5-8v.The channel B works ok instead. Harry potter deathly hallows part 1 mp4movies download. Hi guys, I recently bought my first oscilloscope used and although all the functions work ok,I'm having problem with the vertical gain on the first channel.It can't measure the voltage right. I don't have the service manual or a schematic so this is a nightmare to figure out. I have this Protek P3502 (aka Hung Chang 3502) oscilloscope that has a couple of power resistors that got cooked. Hung shang: os635: francky: Analog Multimeter. But it is not possible to help you to do this from a forum.You will have to do a lot of reverse engineering.Hung chang multimeter analog: Full Text Matches - Check > hung chang multimeter analog: Forum Matches - Check >. (high voltage probe recommended) 7) check and repair the trigger and time base. ![]() 6) check and repair the focus and brightness circuits. For the rest, it will be necessary to follow the usual principles: 1) check the supply voltages 2) repair bad contacts and bad solder 3) repair the damage of previous repair attempts 4) with the type of crt, check the pinout and measure the voltages of the vertical and horizontal deflection plates (Caution: there is high voltage on some pins of the crt) 5) Check horizontal and vertical amps in X / Y mode and repair them. One positive point is that there is high voltage. If it were Hung Chang OS-620, that would be easy, I have already repaired several.* But this model, I've never seen it. It seems that there are multiple failures and even problems resulting from attempts at repair. Without service manual or, at the very least, schematics, it seems difficult to repair this oscilloscope. ![]()
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