Jaycar 5300 LED display

[Crescent Kao]

Ok.. upon further investigation..

I replaced the 10ohm resistor that was burned and powered up the display..
it will cycle through the "tec" -> "11c" -> "10. <="
However, playing with the sensor voltages to vary the display shows that the
middle horizontal led on all the 7-segment LED's are not lighting up
anymore. However, the unit still appears to function properly when hooked up
to the WB02.. about half the led's on vertical bar graph LED also not
working anymore either.

Is there any way to determine if the LED's are still good or if its another
problem? The PIC16F84A chip 'appears' to be good as there is no visual
damage to it. I was planning on replacing the three 7-segment LED's but
Radio Shack doesn't carry them so I have to order them online unless I can
test them to verify that they are good/bad.

Thanks.


Crescent Kao
Director of Marketing and Sales
www.c-speedracing.com


----- Original Message -----
From: "Jeff Meager" <jmeager at bigpond.com>
To: <diy_efi at diy-efi.org>
Sent: Monday, February 04, 2002 3:36 PM
Subject: RE: Jaycar 5300 LED display


> The other thing to remember.  When you use the two 1.5volt batteries for
the
> calibration and you inject the adjusted voltage into the signal line,
> remember you also need to run a wire from the -ve of the two batteries to
> the -ve power input of the display - ie, give it an equivalent ground
> reference.
>
> Email me privately if you don't get this.....
>
> Jeff
>
> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Peter Gargano
> Sent: Monday, 4 February 2002 5:49 PM
> To: diy_efi at diy-efi.org
> Subject: Re: Jaycar 5300 LED display
>
>
> > Crescent Kao wrote:
> >
> > Can anyone shed some light on the situation? . . .
>
> Also, check that the diode REF1 is in the "wrong way around". It
> is reversed and one leg sticks out relative to the original circuit.
> Compare it with the image:
>
>   http://www.home.aone.net.au/techedge/vehicle/wbo2/fmdpcb2.jpg
>
> Peter
>
> ----- End of forwarded message from owner-diy_efi at diy-efi.org -----
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