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freax 30th December 2012 06:52 AM

Check out this dangerous as all hell design. (Don't do what they do here!)

I nearly had a heart attack at the mere sight of this...

notice how the UNFUSED, UNSWITCHED, UNCOVERED 2-core mains comes directly in from the power cord to the transformer, and that its the Secondary wiring which is fused!!!!?????

As found on a Pioneer CT-W103 tape deck.:eek:

dagerman 30th December 2012 07:00 AM

Cost pressures...?
primary winding=fuse if anything goes south downstream; you just have to be willing to replace the $$$$ transformer instead of a .$ fuse.

I find it actually more disturbing that there is no insulation whatsoever on the solder connections that carry line voltage to protect from consequences when accidentally touching with meters, tools, hands, etc.

It seems these kinds of shortcuts become more and more common, especially since most stuff nowadays just gets kicked to the curb when it breaks, instead of being repaired. Because new is cheaper.... NOT.

freax 30th December 2012 07:21 AM

I can honestly say that I've never seen a consumer product that was so dangerously designed as this in all of my years of popping covers.

And there is no mains fuse underneath on the hot pcb, I checked.

I promptly double checked to see if it was unplugged and put the cover straight back on, no way I'm going to be working on this unit.

And this isn't a hack or something that has been put on afterwoods, the soldered joints look original.

Mooly 30th December 2012 07:23 AM

Nothing out of the ordinary there and tbh nothing that is dangerous to the consumer or an experienced technician. Its absolutely standard pratice, even 20 years ago or more.

The label on the rear gives all the information neccessary. No user servicable parts inside and dangerous voltages.

TonyTecson 30th December 2012 07:34 AM

i see that in many Japanese amps and even cd biggie...

freax 30th December 2012 07:36 AM

Yeah I know.. I've seen it too mostly in VCR's, but this one is sticking right up at the top of the chassis, usually you find it somewhere hidden or out of the way..

Maybe I'm overacting a little bit but yeah... its not nice to see a big nasty active and neutral line sticking up like that.

In the pioneer you've got 3 points of contact on a pcb thats high up in the air that could potentially kill you.

This is an inch off the roof of the cover.

This is what its like in a sherwood:

Gyuri 30th December 2012 08:11 AM

The service manual shows there is a primary winding fuse in the transformer block. (at least.)

Gyuri 30th December 2012 08:15 AM

I just sent it to you now.
It is a little bit more than nothing.

wintermute 30th December 2012 08:15 AM

Personally I insulate with heat shrink or other means any exposed mains cabling, just to remove the chance of brushing against it when troubleshooting something with the power on. It doesn't take much and could save your life.


TonyTecson 30th December 2012 08:16 AM

the fuse is actually built in at the power traffo bobbin primary, a type of non-reset-able thermal fuse, i have repaired lots of these in the past...

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