Component level repair and desoldering

[Thomas Prufer]

Coupla folks over here have spoken well of the Aoyue range of SMD hot air stations....

Thomas Prufer

[tony sayer]

In article , NT scribeth thus

There was a modification to cure that which IIRC only affected older sets. They did a mod that used a 100K resistor to make it slow switch on which saved a lot of fuse blowing;!...

[Man at B&Q]

[e-mail]...

Glue is used for double sided assembly and where boards need to be wave soldered after smd assembly. It stops the smd components from falling off.

MBQ

[Man at B&Q]

During can be more critical.

MBQ

[NT]

I suspect you're thinking of another set. The G8 used a great big dropper resistor, then a thyristor, then the reservoir cap. So there was never any fuse popping problem, and the hit & miss operation mode at a low 100Hz switch speed made considerable voltage variations inevitable.

NT

[Dave Plowman (News)]

The earlier G6 - the one which produced more radiation than Chernobyl - used to blow even a 13 amp fuse in the plug.

[Doctor Drivel]

Google 'capacitor plague' or 'failed capacitors'. It all started when the Chinese stole a beta and unproven recipe for electrolyte and used it to make a few billion duff capacitors. These were sold cheap and snapped up by a large range of manufacturers. Japanese capacitors are generally the best.

A good way of detecting a failing electrolytic capacitor is to measure its casing temperature with a tiny thermocouple probe. When the units start to fail they start to pass DC as well as pure AC and get quite warm aorund 40C. Replacing these cheap components can bring many computer motherboards, computer power supplies, LCD televisions and other pieces of kit back to life.

In the USA there is a whole industry where men do nothing but replace capacitors in LCD TV power supply circuits for example. Go to a scrapyard and you can get expensive TVs for nothing and just replace the capacitors with quality makes and they burst into life.

Modern ecu's, pcb's etc are all affected giving some older quality products a bad name.

[Dave Plowman (News)]

Easier to use an ESR meter.

[geoff]

In message , "Dave Plowman (News)" writes

Stand back that man ...

Drivel is an expert on failure

[Doctor Drivel]

Maxie I have observed many failures - many. Maxie, the world is failing rapidly. Magnificent people like yourself take the lead in reversing the process. Your job is never done Maxie, never done. What a man!

[Frank Erskine]

By looking in the mirror?

[dennis]

So how many mirrors do you have?

[Doctor Drivel]

I have seen Failed mirrors.

[Dave Plowman (News)]

Indeed. An expert on all things failed.

[Doctor Drivel]

I have just identified failure right now.