Full Version: Techincal Help Please
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While DJing lasat nite one of my speakers kept cutting out after abnout half an hours use, i checked all the leads etc all seemed fine, but when i tapped the top of my amp the speaker would break into life, anyone got any idea wot vould have gone wrong inside the amp??
Normally if a fault occurs/rectifies itself when tapped or vibrated the most likely cause is a dry joint or poor connection. If you are not tecnically inclined the best thing is to take it to your local repairer because the one thing that is definite is that it will only get worse 
Paul
Paul
Sounds like the de-thump relay could be the culprit.
But take note of the above post:
No user-servicable parts inside. Unless you know exactly what you're doing.
But take note of the above post:
No user-servicable parts inside. Unless you know exactly what you're doing.
A good soldering iron will do the trick along with some decent silver solder, hoping that this is the cause its normaly a cheap repair and easily done if in the know, electronics is my 2nd hobby
If you give me the make and model of your amp I may be able to help
Colin
Colin
| QUOTE (chrismk @ Nov 7 2005, 01:42 AM) |
| A good soldering iron will do the trick along with some decent silver solder, hoping that this is the cause its normaly a cheap repair and easily done if in the know, electronics is my 2nd hobby |
Does it really matter if its silver! Maybe if your a home audio buff then okay...but otherwise normal solder is fine?
I took the top of it today, had a look and put it back on and took it to my local Electrial repair shop, i'm a car mechanic by trade and i hadnt a clue what i was looking at, its a JB Systems C2 650
Yes, normal solder is fine, well it used to be but with new regulations from the lads in Brussels, solder is'nt what it used to be as the solder you buy now contains zero lead, silver solder is also alot better at holding things together and might just prevent it happening again if it was heat related issue say on a Mosfet transistor
Cheers
Cheers
One point about silver solder is that it requires higher bit temperatures, as it has a higher melting point. If doing the job yourself, be careful not to overheat adjacent components.
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| took it to my local Electrial repair shop |
Good move
Paul
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| Yes, normal solder is fine, well it used to be but with new regulations from the lads in Brussels, solder is'nt what it used to be as the solder you buy now contains zero lead |
Yeah it's a new regulation called the ROHS directive, and from July 2006 every electrical product manufactured or imported into the UK has to comply, and this means having a zero lead on every solder joint on the PCB (or connector in the case of leads). The main implication of lead free solder is the tip temperature of the soldering iron has to be higher, which makes soldering lead free solder very difficult with conventional soldering irons.
The plating of the PCB's (the pad which takes the soldered joint) also has to be changed as well, to lead free, which means using either tin or gold plating (silver is too expensive at general manufacturing level). The problem with these materials is that they tarnish very quickly when exposed to air, and also the lead free solder gives a dull looking solder joint by default, which makes finding manufacturing imperfections at factory inspection level very difficult, and with the aging process, also makes these imperfections more likely to make dry joints and intermittant faults a more frequent occurance than conventional lead soldering process.
Whilst this techie info may seem out of place, and immaterial here, it does have some relevance. In that I have a horrible suspicion that the number of DJ's posting that they have problems with new equipment is likely to increase towards the end of 2006, as the new soldering facilities are brought online and the learning curve is established.
Oh, and did you know that old Electrical equipment also has to be recycled?. So no longer can you dump that old Datamoon down at the local tip, you will soon have to send it back to the manufacturer / electronics recycling centre!.
Please post your dead datamoons to me....Most people though like to keep hold of their beloved NJD's...
Yes I'm getting letters from the component people advising changing part numbers, even things like LEDs are not allowed to have their legs ready-tinned with lead-based solder! I think service departments are exempt aren't they. Sounds futile when you imagine all those rotting nuclear submarines festering in Russian ports....
Yes I'm getting letters from the component people advising changing part numbers, even things like LEDs are not allowed to have their legs ready-tinned with lead-based solder! I think service departments are exempt aren't they. Sounds futile when you imagine all those rotting nuclear submarines festering in Russian ports....
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| I think service departments are exempt aren't they |
I doubt service depts will be getting a visit (or interest) from the Anti-lead brigade
, although it is advised that in the future where a product is returned for repair which is 100% lead free, that any repair work is carried out in lead free solder to avoid contamination, although I can't see this ever being enforced - manufacturing is their prime target.As you say, electronics production only account for around 0.5% of lead contamination in waste, where as the battery market (exempt from the legislation) accounts for around 80% of lead in landfill sites.
Interesting to note that this is just a Europe-wide piece of legislation, and that the US and Far East are not affected, except where their products are exported to European countries.
I'm sorry Chris, but that is not accurate
It is a worldwide movement.
Admittedly in the US (not Japan) it is "voluntary" but the pressures of such things as applying for grants, planning permits etc mean that it is in reality mandatory. Couple that with the law of supply and demand and soon in the US it will be all but compulsorary as it will be uneconomic to swim against the tide of what everyone else is using.
A complication of banning something in the US is that the legal system is so litigatious that if the government fails to prevent someone from doing something illegal it may well find itself joined in a disasterous lawsuit. It is one of the reasons why many things in the US are not banned by law.
One of the main lobbyists for lead reduction is China itself which as new home to the world's electronics industry doesn't want to become a wasteland.
Ridding lead from electronics is not without problems as you expertly pointed out, however the same was true of ridding it from paint, and ridding buildings of asbestos. Some things just have to be done.
The battery issue is one for another day because there are no effective substitutes whatsover as it stands, but I guess as fuel cells become safer that will be tackled also.
"Europe" is blamed for far too many things in the UK media. Rise above it.
Helpful link here:
http://www.kester.com/en-us/leadfree/legislation.aspx
It is a worldwide movement.
Admittedly in the US (not Japan) it is "voluntary" but the pressures of such things as applying for grants, planning permits etc mean that it is in reality mandatory. Couple that with the law of supply and demand and soon in the US it will be all but compulsorary as it will be uneconomic to swim against the tide of what everyone else is using.
A complication of banning something in the US is that the legal system is so litigatious that if the government fails to prevent someone from doing something illegal it may well find itself joined in a disasterous lawsuit. It is one of the reasons why many things in the US are not banned by law.
One of the main lobbyists for lead reduction is China itself which as new home to the world's electronics industry doesn't want to become a wasteland.
Ridding lead from electronics is not without problems as you expertly pointed out, however the same was true of ridding it from paint, and ridding buildings of asbestos. Some things just have to be done.
The battery issue is one for another day because there are no effective substitutes whatsover as it stands, but I guess as fuel cells become safer that will be tackled also.
"Europe" is blamed for far too many things in the UK media. Rise above it.
Helpful link here:
http://www.kester.com/en-us/leadfree/legislation.aspx
Facsinating thread, I was wondering about the content of the solder many years ago. Learn something new every day eh!
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| "Europe" is blamed for far too many things in the UK media. Rise above it. |
Well said!
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| I'm sorry Chris, but that is not accurate |
Well, i've been fed mis-information at the seminar I attended through my employment, i'll have to demand that my employer asks for his money back
- although it was worth it just for the wine and sandwiches 
.Interestingly "we" do sub contract work for Federal Signal in the U.S, and they have no requirement to meet the directive.
Another Boring Lead Free Link
Ahh not the RoHS directive. Spend my working days involved with this!!!!
It certainly is a global issue.
This directive means well, the idea was to reduce the amount of used electrical equipment ending up in landfill sites, whereby over time all the nasties contained within them ended up in our drinking water etc.
The directive considers 6 materials, these are:
lead
mercury
cadmium
hexavalent chromium
polybrominated biphenyls (PBB)
polybrominated diphenyl ethers (PBDE)
Personally I belive taking lead out of solders was a wrong move. Lead free solders use more heat, hence more energy to process. There are also numerous exemptions from the directive. For example if you use high melting point solders that have more than 84.5% lead these are exempt until 2010 as there are no alternative lead free alternatives.
Other exempt applications are:
Military
Networking
Telecoms infrastructure
Certain biomedical products
More emphasis should have be given to recycling, re-using the lead.
For a home or DIY electronics enthusiast, there should be very few problems. Unless using a thermostically controlled soldering iron (these can be adjusted), most basic irons will reflow lead free solders with no problem. These typically reflow at 220-245oC compared to 180-200oC for lead based. The concern will be at higher temperatures the chance to damage components being soldered will increase as the joint will take longer to reflow.
If you do many repairs, get stocked up with lead based solder!
Cheezy
Nightsounds
It certainly is a global issue.
This directive means well, the idea was to reduce the amount of used electrical equipment ending up in landfill sites, whereby over time all the nasties contained within them ended up in our drinking water etc.
The directive considers 6 materials, these are:
lead
mercury
cadmium
hexavalent chromium
polybrominated biphenyls (PBB)
polybrominated diphenyl ethers (PBDE)
Personally I belive taking lead out of solders was a wrong move. Lead free solders use more heat, hence more energy to process. There are also numerous exemptions from the directive. For example if you use high melting point solders that have more than 84.5% lead these are exempt until 2010 as there are no alternative lead free alternatives.
Other exempt applications are:
Military
Networking
Telecoms infrastructure
Certain biomedical products
More emphasis should have be given to recycling, re-using the lead.
For a home or DIY electronics enthusiast, there should be very few problems. Unless using a thermostically controlled soldering iron (these can be adjusted), most basic irons will reflow lead free solders with no problem. These typically reflow at 220-245oC compared to 180-200oC for lead based. The concern will be at higher temperatures the chance to damage components being soldered will increase as the joint will take longer to reflow.
If you do many repairs, get stocked up with lead based solder!
Cheezy
Nightsounds
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