🚀 go-pugleaf

On Mon, 05 Jan 2009 14:34:36 +1100, Sylvia Else
<sylvia@not.at.this.address> wrote:

>Phil Allison wrote:
>> "Sylvia Else"
>>  "No legg to stand on "
>>>>>>  **  Jesus Christ  -
>>>>>>
>>>>>> get fucking real you asinine fucking WOG  WANKER !!
>>>>>>
>>>>>> The  WHOLE  damn AC unit is metal encased,  installed &  MAINS  earthed 
>>>>>> !!!!
>> 
>>> My test repair with a non-fusible resistor and an NPN transistor from my 
>>> stock seems to have worked (rather to my surprise), so I'll have to source 
>>> a fusible resistor now.
>> 
>> **  WES Components in Ashfield have them.
>> 
>>   Code:  " 1F8.2 "  for 24 cents each.
>> 
>> 
>>> I'll take your comment about a hi-pot on board, though in fact I've only 
>>> worked on the high voltage side of the system - the transformer hasn't 
>>> been touched. Still, I suppose insulation breakdown in the transformer 
>>> could be implicated in the original failure.
>> 
>> 
>> ** Ignore "legg"  -  he is an ignorant twat.
>> 
>> There is no such industry practice as he alludes to in the repair of  SMPSs 
>> incorporated inside products.
>> 
>> Where the PSU is a module and plenty of stock is available at LOW cost to a 
>> repair organisation -  of course they prefer to just replace it, no matter 
>> what the fault.  Any excuse in the book is then dragged out to justify that.
>> 
>> Where such replacement is  NOT  possible or would be uneconomic -  it get 
>> repaired just like you have done.
>> 
>> BTW:
>> 
>> What does "legg" have to say about the way your SMPS was installed in the 
>> outside unit of an air-con with no protection against water ingress, 
>> condensation or invasion by any and all insect and rodent life ?
>> 
>> What does that do for the " safety isolation "  angle  - eh  ???
>
>He might be unaware, since I posted that in a separate thread to 
>different groups. That thread was basically an opportunity for me to 
>winge about the quality of the circuit board, and give a heads up to 
>anyone considering buying an A/C unit.
>
>I only posted this thread here when I had found something definitely 
>wrong with the PS, other than that it simply didn't work.
>
>Legg FYI, that other thread referred to the fact that the board had 
>obviously suffered somewhat from being inadequately protected from the 
>environment and small creatures. I found a dead spider, some of its web, 
>and a good deal of dirt on the board.
>
>http://members.optusnet.com.au/sylviae/cbCrop.jpg
>
>Sylvia.

Unless it was x-posted to s.e.d. I won't see it. It's also -10C here,
with not much call for AC at the moment. I clean my central AC heat
exchanger each fall - I assume that discrete units might benefit from
similar treatment.

I think you mentioned that the unit was 10 years old; can't have been
too unsuitable an installation, if you're only having trouble with it
now. Funny how people religiously clean their computer cpu heatsinks
and fans, but expect AC units to clean themselves.

Glad to hear you've had success reviving the unit.......fusible or
flame-resistant resistors are not hard to get, with sources like
DigiKey, on-line. 

By the way, what kind of scope were you using, that had Huntron-like
branch stimulation capabilities?

RL