Re: 25" Amplifone Brightness Problem

Sorry. I should have mentioned that yes the diode did test open in
the other direction. The other 1N4001 tested the same so we figured
.56v was ok. I know diodes are typically around .7v but that can
vary depend on what they are made of. Thank you for more insight on
this though.

I also forgot to add:
6) I soldered the new wires to the origional pin holes from the old
    HV unit. I took the wires through to the underside of the board through
    the second mounting hole. But instead of following the traces and
    soldering at locations with other component leads I put them right
    where the pins used to be from the old HV. This is a problem potentially
    if the solder or wire goes through the hole and contacts the metal
    case of the new HV unit. I'm a bit worried that this could be the case
    here and I just thought of it this morning when I realized the FAQ
    I used did not mention the tape insulation step.
7) The FAQ I used mentions the pin positions and specifically mentions
    putting green to 9 o'clock. There is not a pad at 9 o'clock and I
    assumed 11 o'clock based on the previous line in the FAQ.
8) The other FAQ problem I saw was that it mentions drilling out the
    mounting hole (slightly larger) to 3/8". That is WAY TOO BIG. Luckily
    I used my brain and didn't drill it out that bid. But thought I should
    note the error.

Greg

On 2002.03.07 10:29 solarfox@texas.net wrote:
>> On Thu, 7 Mar 2002 10:11:49 -0500, you wrote:
>>
>>> 2) The 4001 diode that was in backwards was tested and was .56v in one
>>> direction. I have extra so I'll just replace this anyways.
>>
>> But did it show "open" (infinite resistance) in the other direction?
>>
>> It probably can't hurt to replace it on general principles (1N4001's
>> aren't exactly rare and precious items!), but just for future reference:
>> It's been my experience that power-rectifier diodes, such as the 1N4001,
>> tend to show a lower junction voltage when tested with a DMM than the 0.7V
>> you'd normally expect from a small-signal diode or transistor - so 0.56V
>> doesn't necessarily mean the diode is bad, as long as it remains open in
>> the other direction. (Now if you start seeing junction voltages <0.3V, you
>> may have a problem - unless you're dealing with a Schottky diode! :) )
>> -----------------------------------------------------------------------------
>> "For the children" - the phrase politicians use to justify a course of
>> action
>> so irrational it cannot be justified in any other way.
>> -----------------------------------------------------------------------------
>> solarfox@DON'TMESSWITHtexas.net (Gary Akins
>> jr.)
>> http://lonestar.texas.net/~solarfox
>> -----------------------------------------------------------------------------
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Received on Thu Mar 7 07:59:09 2002