nippon seiki


Information and questions on GL1500 Goldwings (1988-2000)
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billcrawford
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nippon seiki

Postby billcrawford » Thu May 14, 2015 11:55 am



i have sent email to this co. that made our lcd on goldwings. i have got no response. has any one else tried to contact them concerning the lcd displays?



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WingAdmin
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Re: nippon seiki

Postby WingAdmin » Thu May 14, 2015 12:59 pm

I would be extremely surprised if you get an answer from them. I don't think they're in the habit of answering end-user inquiries about items they manufactured for a large multinational company fifteen years ago.

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deanbw
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Re: nippon seiki

Postby deanbw » Thu May 14, 2015 1:55 pm

wow, I'm sure to them that part was obsolete 10 minutes before they ran the last one. I doubt you would even find anyone there who could tell you anything about your display if you did manage to get a response.

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virgilmobile
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Re: nippon seiki

Postby virgilmobile » Thu May 14, 2015 3:57 pm

This obsolete display just begs for someone to design a interface for that...
Hmmm....it is just data coming out of the radio that drives the display module isn't it.???
Who could tag the data,clock and blanking pulses and bluetooth them to a APP on a easy to find I-Pod touch....?????
Or convert to a dot matrix display thats currently available...

billcrawford
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Re: nippon seiki

Postby billcrawford » Thu May 14, 2015 4:56 pm

way to go virgilmobile, someone step up and fix our lcd problem, im sure we have very intelligent people on here

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virgilmobile
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Re: nippon seiki

Postby virgilmobile » Thu May 14, 2015 10:34 pm

I'm not swamped this weekend. Sooòooo.I'm gonna look at Digikey for a display and some data specs to see if it's possible

billcrawford
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Re: nippon seiki

Postby billcrawford » Sat May 16, 2015 4:54 pm

have you got a solution to cracked LCD?

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virgilmobile
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Re: nippon seiki

Postby virgilmobile » Sat May 16, 2015 8:40 pm

Not finished looking yet.Lots of details just to start with to sort out.
Then its matching to the wing specs.
At the moment,the most important function of the display seem to be the radio display and clock.

billcrawford
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Re: nippon seiki

Postby billcrawford » Sat May 16, 2015 9:20 pm

is there any way to pull a vacuum on the display and reseal it ? would that make the dark spot go away

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WingAdmin
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Re: nippon seiki

Postby WingAdmin » Mon May 18, 2015 12:58 pm

billcrawford wrote:is there any way to pull a vacuum on the display and reseal it ? would that make the dark spot go away


Not likely.

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Re: nippon seiki

Postby WingAdmin » Mon May 18, 2015 1:19 pm

virgilmobile wrote:Not finished looking yet.Lots of details just to start with to sort out.
Then its matching to the wing specs.
At the moment,the most important function of the display seem to be the radio display and clock.


For reasons unknown, the LCD also processes the wheel speed sensor signal:

LCD wheel speed input/output
LCD wheel speed input/output


Part of the circuit would require identifying just what it is doing (if anything) to that signal.

Other non-LCD functionality built into it: the power-on-self-test for the warning lights: the LCD provides multiple grounds on separate wires for a couple seconds upon power-up, which is used to light up the various warning lights. Probably no more than a row of transistors with common bases that provide a ground when biased for a couple of seconds. The LCD unit also provides regulated power for the fuel and temperature gauges, voltage unknown.

The clock functionality is almost entirely internal: the audio system provides a constant +5V that is always on, regardless of ignition. This is used to power the clock. I don't know what the power requirements would be, but I suspect a PIC might be too much: perhaps a discrete RTC chip powered by that +5V, and the PIC or Arduino or whatever could pull the time from that chip. It also has three wires that come from the clock adjust button: a common, and one wire each for hour and minute.

There is a line going into the LCD that when +12V appears on it, it switches the LCD into pressure reading mode. The LCD has three lines which go to what equates to a potentiometer, resistance/taper unknown. This is what is used to measure the pressure in the suspension. We'd need to map resistance values to pressure values to calibrate a replacement to match this functionality.

The LCD also has an input that gets +12V when the decrease pressure button is pressed, for reasons unknown.

The various data displayed on the LCD (with the exception of the clock and the air pressure) is all controlled by the radio. The radio has five lines going to the display:

Data
Load (likely a load signal to load data once it's changed?)
Clock
Data Ground
Blanking (blanks the LCD display when starting)

So we'd need to scope out and reverse-engineer the serial protocol from the radio to the LCD. It appears to be unidirectional, which makes it easier. If you want to reverse-engineer the protocol, I could definitely design a processor circuit and write code to decipher and process it, as well as drive an LCD to display it.

We'd also need to source an LCD panel that would fit, and that was self-illuminating.

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virgilmobile
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Re: nippon seiki

Postby virgilmobile » Mon May 18, 2015 1:28 pm

Yup.Been through the special needs.The LCD assembly is a custom computer and display.Short of designing a complete new system,about all that's left is a adaptation of a avaiable dual 3.5 digit display and loose the custom icons.
Not a real good idea.

billcrawford
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Joined: Mon Feb 16, 2015 5:16 pm
Location: flower mound. texas
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Re: nippon seiki

Postby billcrawford » Mon May 18, 2015 1:38 pm

well darn, sounds like you tried. maybe sometime it will come to you

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Re: nippon seiki

Postby WingAdmin » Mon May 18, 2015 1:43 pm

virgilmobile wrote:Yup.Been through the special needs.The LCD assembly is a custom computer and display.Short of designing a complete new system,about all that's left is a adaptation of a avaiable dual 3.5 digit display and loose the custom icons.
Not a real good idea.


I wouldn't even attempt that. There are tons of generic addressable-pixel displays that can be used with appropriate software to display anything you like. A lot of them already have driver libraries available. That's exactly what I did for my little "Bike PC."

Image
Image

I'd try to find a high-reflectivity, high-contrast, monochrome, backlit LCD with at least 320x240 resolution.

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virgilmobile
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83 GL1100 I
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84 GL 1200 I

Re: nippon seiki

Postby virgilmobile » Mon May 18, 2015 1:53 pm

Yes it could be done.The end cost may even rival the replacement ones.R&D and all.
I just have to explore the KISS idea first.




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