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Viewing 1 to (6 Total) KN1600 operating sytem |
Netherlands
Total Posts: 1
Joined: June 9, 2016
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Can somebody help me.
I have a sx kn1600 and the tempo weel was broken. I have replaced it.
From the moment i put the machine together i get the message " Caution!! **Error in CPU data transmission."
I think I have to reflash te ROM. Does anybody have the operating systemfile for the KN1600, so i can reflash the ROM?
Tags:
systemdisk kn 1600
Posted on June 10, 2016 at 9:03 AM
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United Kingdom
Total Posts: 2
Joined: August 3, 2016
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Re: KN1600 operating sytem
Hi there,
I have the very same problem on a Technics KN-1600 in that we powered up the keyboard after replacing some keys & we’re now getting the message “Error in CPU data transmission." & the keyboard won't come on. The keyboard worked perfectly well before we started the job. However we thought we’d a screw trapped under the main board so we removed the main board & the power amplifier board to check but couldn’t find the screw so I think it had dropped out earlier. Obviously we had to unplug many connections to remove the boards, but we’ve double-checked all the connections now we’ve put the boards back & everything looks fine. We've tested the capacitor that looks after the memory backup & that was okay as was holding a charge & we've done a continuity test on the ribbon cables & that's come out positive also. So we don't know what else to try. Did you ever sort the problem on yours & if so how?
Regards,
Mr Brett Hollingworth
Owner/Manager
Octaves Yamaha Music Point
81 Bridge Street
WALSALL
West Midlands
WS1 1JQ
01922 613058
07769 518540
[email protected]
octavesyms.co.uk
Posted on August 3, 2016 at 12:31 PM
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United States
Total Posts: 4
Joined: July 8, 2015
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Re: KN1600 operating sytem
Hi, I have the same problem, "error in cpu data transmission" on my kn6000. Did you find a fix?
Posted on October 28, 2017 at 11:45 PM
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United Kingdom
Total Posts: 166
Joined: January 12, 2015
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Re: KN1600 operating sytem
Before you all start trying to do something drastic to fix this can I add my help here.
First, if you have disturbed the boards in these machines then the first things you need to look at are the connectors. For the unit to work correctly, at boot up it sends code from the main boot up sequence to all the other chips scattered all over the machine and waits for the response from these chips. It may be only a byte or two of code but it is the initialising string that makes things like the keyboard encoder and the MIDI out and in interfaces work correctly. So when these short sets of code are sent out first they have to get to their destination and then there must be a return string to tell the main processor what is happening. Therefore any error that you get on the display is a result of this initial process not working and not hand shaking correctly.
Prime candidates in all of this are dirty connectors. Given that you have ad to remove the boards you will have disturbed the resting place of those connectors that may have only been touching with a tiny part of the actual connector. Most the the communication is on bi-directional buses so they have to work both ways and given the age of the machine and likely tarnishing of the contacts any of them can act like diodes and not do what they are supposed to. So if you get this situation before you do anything else get yourself some servisol spray, remove the connectors, spray the plugs and the sockets, and then try it again. If this doesn't fix it then you may have to clean the socket pins and the best thing for this is PCB cleaner and a little toothbrush very gently over the pins and then, once dry another squirt of servisol.
I would doubt very much that there is anything drastically wrong with the rom in these machines. It is a rom not an eeprom or a eprom and therefore is unlikely to be corrupted or changed in any way. In any case you would have to remove it from the board and ave another known good one to copy to make a new one. Very unlikely to happen!
Let me know how you get on!
Regards
Dave Tutt
Posted on October 30, 2017 at 10:48 PM
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United Kingdom
Total Posts: 166
Joined: January 12, 2015
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Re: KN1600 operating sytem
Oh, I almost forgot. These are buses, like in computers, so they could be 4,6 or 8 bit wide and of course all those connections have to work and as I said in both directions so any connector acting like a diode will bring up the same errors! If I remember correctly some of the chips only have a 8 bit bus but actually only get a 6 bit wide string. The fancy chips where the voices are generated are more likely to be controlled with 8 or 16 bit code but as a consequence are direct coupled to the main processor via bus buffering chips so these always start up correctly. If they don't, scrap Im afraid!
Dave
Posted on October 30, 2017 at 11:18 PM
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United Kingdom
Total Posts: 2
Joined: August 3, 2016
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Re: KN1600 operating sytem
Hi Dave,
Sorry for the delay in my response.
Unfortunately I didn't find a fix for the message 'Error in CPU Data Transmission' that I was receiving on my Technics KN1600 keyboard, so decided at the time to put it to one side & maybe to return to it at a later time as couldn't afford to spend anymore time on it as had other repairs to do.
Thanks for your info Dave & will go through it all soon with the hope of getting to the cause of the problem.
I think you're definitely right though Dave when you say about the various connections to the boards having to be good, as recently I repaired a Technics SX-PR602 digital piano that after changing several broken keys I received the message 'Error in CPU Data Transmission'. But when I reopened the piano up I found that I'd left a cable adrift. When I connected this cable the piano was fine. So this suggests that all connections have to be good to avoid the 'Error in CPU Data Transmission' message.
Regards,
Mr Brett Hollingworth
Owner/Manager
Octaves Yamaha Music Point
81 Bridge Street
WALSALL
West Midlands
WS1 1JQ
01922 613058
07769 518540
[email protected]
octavesyms.co.uk
Posted on November 9, 2017 at 11:06 PM
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