Jaycar 5300 LED display

[Crescent Kao]

Hey guys,
  Thanks for the replies!! I finally got the display working! Don't ask me
how, it just started to work all of a sudden and I didn't really even touch
or change anything... I did have to swap out VR3 back to the original 20k
since I couldn't adjust the lower 14.00 calibration point.
  I ran into a problem though... Once Iconfirmed that it was working by
comparing values to my DVM, I temporarily installed the unit and then
powered it up in the car with the WBO2.. it worked flawlessly... I then shut
the car off and a few minutes later decided to try it again.. however this
time the display didn't light up.. so after about 20sec I turned the power
off and took the display apart.

The big 10ohm resistor on the lower board is burned!!! And now when i power
up the unit, some of the LED bars on each digit don't light up (including
some of the bars the vertical LED on the right)!!

However, with the unit still seems to function correctly with the WB02 as it
still fluctates and from what i can read from the display, it still works -
but like I said, some of the bars don't light up now and make it hard to
read.

Is there some way for me to diagnose this? Or should I just replace all the
leds with new ones and replace the 10ohm resistor (would the problem be
isolated to just those components?)... I guess the unit should have been
fused?? Would a 5A inline fuse be sufficient?

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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