Ferrari Mailing List: Re: Bingo...

[Rick Moseley (ramosel]

Woohoo.   Nice find in the book and in the car.

They may tie the dimmer circuit to the driver circuit for the display.  Using a voltage divider so when you turn up the backlight it ramps up the display to keep it from washing out.  For longevity, I'd keep as dim as you can and still read it.

So is the fourth digit just a "1"?  If so, the clock IC is probably a VLSI.  Philips (Dutch) bought them out and dumped about 80% of their line.  They were only after a patent on some SMC formats.

So what is the "secret" switch on the panel?  Or have you pushed it?

On Sunday, January 23, 2022, 09:28:26 PM PST, Peter Rychel <dino308gt4 [at] hotmail.com> wrote:

And just like that, it works.

 

I did look through the workshop manual and the wiring diagram was buried deep within it (thanks Cody!).

 

So the four wires were easy enough to trace. Black = ground, Green = switched 12V, Blue/Red = 12V hot all of the time and Pink = rheostat circuit. Checking them with my voltmeter showed proper conditions, power wise, except the Pink wire, which traces out to the dimmer switch. Plugging it in and powering it up and it works!

 

Funny, but when turning the dimmer switch, the clock display gets slightly brighter, so I don’t know what’s up with that. I’m not sure I want to tear this thing anymore apart, because it is a functioning clock now (what I wanted to begin with).

 

And the turn signal switch is repaired and functioning too.

 

Onwards...

 

Peter

 

 

Sent from Mail for Windows

 

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