jayprakash Posted November 1, 2023 Share Posted November 1, 2023 Hi everyone, I am new here. I wanted to know can i update/upgrade/rewrite my ctx 870 in model bios firmware? I am unable to find the files to be loaded in the keyboard. Facing peculiar problem in my keyboard. It gets mistuned from 440 hz(default value) to 415.5, randomly, even after resetting/factory reset. Changed its motherhood in warranty period, but still problem exists. Now the warranty expired, but the problem can't be solved. Maybe flashing the firmware/bios can sort out my issues. By pressing 123 & power button, I can see version is 01.05, dated 19-12-04, model showing MX 874B. Can anybody help me please? Quote Link to comment Share on other sites More sharing options...
Brad Saucier Posted November 1, 2023 Share Posted November 1, 2023 The problem is almost certainly the pitch bend wheel. The main board didn't need replacement and firmware is not needed. Roll the pitch bend wheel up and down several times next time the tuning drifts away from 440hz. It will be fixed. Quote Link to comment Share on other sites More sharing options...
jayprakash Posted November 1, 2023 Author Share Posted November 1, 2023 Hi Brad, thanks for the reply. But the pitch bender was also replaced by the service station. But problem still persists. But with your reply, I would love to know how pitch bender can change the default values of tune in the settings option? Quote Link to comment Share on other sites More sharing options...
Brad Saucier Posted November 1, 2023 Share Posted November 1, 2023 If it's the entire keyboard is changing tuning, meaning auto accompaniment as well, then no, the pitch bender wouldn't be the problem. The bend wheel is not able to change auto accompaniment tuning. However, it can alter upper and lower tones. If something in the pitch bender circuit is not functioning normally, tuning can drift. This is usually simple dust and dirt from not using the pitch bender very often. Rolling the wheel self cleans the potentiometer, and that almost always fixes any issues with pitch drift. Quote Link to comment Share on other sites More sharing options...
Brad Saucier Posted November 1, 2023 Share Posted November 1, 2023 2 hours ago, jayprakash said: I would love to know how pitch bender can change the default values of tune in the settings option? Sorry, I misunderstood. I assumed your original post meant that tuning drifts to 415.5 while the display still shows 440. The display value should not change without input from menu buttons or a MIDI control source. Can you identify any of the moments tuning changed? What were you doing when it happened? Quote Link to comment Share on other sites More sharing options...
jayprakash Posted November 3, 2023 Author Share Posted November 3, 2023 Hi Brad, Sorry for delayed response as I am new to forum and permitted for 2 posts per day. Reason for auto drifting in my keyboard is unknown till date. Even if I started to play rhythm, and do nothing with the keys or button, sitting idle, tune shifts, sometimes to 415.5, sometimes to upper side, randomly. No timing fixed to shift. Even the casio service centre failed to solve. They changed the motherboard, but problem still exists. When I complained them ,they said to provide a video so they can see. But I can't make video as there is no fixed time Or mode when the tune can go out. I doubted whether the problem may be related to power supply. So when checked in standby mode (at jackpin inside motherboard), it was showing 09.85 VDC & in ON condition it was 09.75 VDC. I changed with another adapter and i got reading of 09.95 VDC in standby & 09.10 in ON position. With both adaptors, I faced the same problem of tuning getting out. I don't want to give my keyboard to any person here as this is quite a unique problem and everybody will be doing R&D in my set. Can you suggest me something please? Sorry my post went quite long Quote Link to comment Share on other sites More sharing options...
Brad Saucier Posted November 3, 2023 Share Posted November 3, 2023 Unfortunately I don't have any suggestions. It is definitely a unique problem. I have never heard of master tuning changing on it's own without any input from buttons or MIDI. Quote Link to comment Share on other sites More sharing options...
jayprakash Posted November 3, 2023 Author Share Posted November 3, 2023 Can you tell me where can i find the firmware or bios update for ctx 870 in please? That's the thing I can try Quote Link to comment Share on other sites More sharing options...
Brad Saucier Posted November 3, 2023 Share Posted November 3, 2023 This model does not have any firmware updates. Quote Link to comment Share on other sites More sharing options...
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