Jaycar 5300 LED display

Fri Feb 1 19:11:58 GMT 2002

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Hey guys,
  After a few more days of tinkering with the display, I still couldn't =
get the calibration procedure to work properly... The dimmer definately =
works but adjusting VR2 and VR3 with 1.4v and 3.0v doesn't change the =
display still.
  Anyways, I removed the R2 resistor from the board and decided to hook =
it up to the WB 02 in the vehicle, since that works just fine with a =
voltmeter. When I power up the WB02 and the LED display (without =
starting the car - battery around 13.5v), the display prompty shows the =
"TEC" -> "11 c" and then will bounce between "10.4" and "10.5" and the =
bar graph will show nearly full rich (6 or 7th LED will be lit). I then =
tried adjusting VR2 and VR3 at this point, and by doing so, it moves the =
display from around 10.2 to 11.2. The voltmeter on the WB02 at this time =
shows around 2.43v
  If I start up the car (battery should be around 14v) the display will =
go through the "TEC" -> "11 c", and then display "10 c" but the "c" will =
have a horizontal bar under it. Basically like the digit "5" but missing =
the lower vertial leg and the 8th led on the bar will be lit.
  Adjusting VR2 and VR3 at this point have no affect with the car =
started. The Voltmeter on the WB02 still displays around 2.43v at this =
time.

Can anyone shed some light on the situation? I have no idea how else to =
proceed in diagnosing the problem. Thanks again.

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

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<DIV><FONT face=3DArial size=3D2>Hey guys,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp; After a few more days of =
tinkering with the=20
display, I still couldn't get the calibration procedure to work =
properly... The=20
dimmer definately works but adjusting VR2 and VR3 with 1.4v and 3.0v =
doesn't=20
change the display still.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp; Anyways, I removed the R2 =
resistor from the=20
board and decided to hook it up to the WB 02 in the vehicle, since that =
works=20
just fine with&nbsp;a voltmeter. When I power up the WB02 and the LED =
display=20
(without starting the car - battery around 13.5v), the display prompty =
shows the=20
"TEC" -&gt; "11 c" and then will&nbsp;bounce between "10.4" and "10.5" =
and the=20
bar graph will show nearly full rich (6 or 7th LED will be lit). I then =
tried=20
adjusting VR2 and VR3 at this point, and by doing so, it moves the =
display from=20
around 10.2 to 11.2. The voltmeter on the WB02 at this time shows around =

2.43v</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp; If I start up the car (battery =
should be=20
around 14v) the display will go through the "TEC" -&gt; "11 c", and then =
display=20
"10 c" but the "c" will have a horizontal bar under it. Basically like =
the digit=20
"5" but missing the lower vertial leg and the 8th led on the bar will be =

lit.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp; Adjusting VR2 and VR3 at this =
point have no=20
affect with the car started. The Voltmeter on the WB02 still displays =
around=20
2.43v at this time.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Can anyone shed some light on the =
situation? I have=20
no idea how else to proceed in diagnosing the problem. Thanks=20
again.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Crescent Kao<BR>Director of Marketing =
and=20
Sales<BR><A=20
href=3D"http://www.c-speedracing.com">www.c-speedracing.com</A></FONT></D=
IV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV></BODY></HTML>

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