weerty123

Hello, do you have a drawing of the circuit board?

weerty123

xy598646744 published on 2020-11-3 19:42 This machine can only output 200M -30db with a calibration source (that is, the intermediate frequency mixing local oscillator signal inside the machine). Note...

Hello, my R4131D power board is broken. The components are corroded. I can't see clearly what components they are. Can someone give me some advice? I still have a transformer. I'd like to see if I can change a few power supplies. Thank you very much. Please add me on WeChat: Zikp0901

xy598646744

weerty123 published on 2020-12-7 18:46 Hello, my R4131D power board is broken and the components are corroded. I can't see clearly what components they are. Can someone help me? I have a transformer to see if it can...

I am not online often, so I am sorry for the late reply. I don't have the power supply drawing either. If you can determine that it is a power supply problem, you can repair it according to the general power supply design principles and sort out your ideas. In my personal experience, the transformer of a general switching power supply is not so easy to damage compared to semiconductor devices.

weerty123

If you are here, please add me on WeChat. The motherboard has many missing parts. Can you send me a few EPROM chips? I will be very grateful.

weerty123

Missing chip program

xy598646744

weerty123 posted on 2021-2-15 14:45 Missing chip program

It seems that you are missing too many parts. Let me give you a suggestion. I have seen a seller from Chengdu on Xianyu who has a large number of machines that have been soaked in water. You can consider buying one and give it a try. This model is from more than 30 years ago, and many parts are no longer available.