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Lead free solder or poor QC ?

Second so called Vox AC30 in as many months with the main problem being the simplest of components on the pre-amp board. The wire bridging links , solder points therof, for the DC and ground lines to the ECC83s. The power amp board is more robust wiring and hand soldering, rather than wire links and no problems there. The failed one , with a pair of long nose pliers grabbing the end of the wire and only marginal extraction force, the wire comes through the "solder joint". On most of these wire joints there are no "volcanoes" unlike the other components - is it the wrong size wire/holes, so this lead free stuff moves capillary fashion preferentially along the pcb holes and leaves little at the pad , so only marginally covered?

2005 made, bought 2006, and just out of 1 year warranty. So reworking all such wire joints and also small caps which seem to have similar lack of solder depth.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook
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What are the wire and hole diameters ?

Graham

Reply to
Eeyore

the

lines

than

"solder

moves

at

Its all re-assembled now , wire size only is measurable, 20 mil diam.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

What I was trying to acertain was whether the wire was a loose fit in the hole. Solder doesn't like that.

Graham

Reply to
Eeyore

hole.

the 1/3 W resistors have the same diameter leads and they have normal volcanoes and presumably through the same size drillings

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

On principle I never presume anything like that. I use hole sizes from 0.7mm to

1.3mm in 0.1mm increments on my designs for a variety of seemingly routine leaded parts.

Graham

Reply to
Eeyore

1/3 W? 
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
Reply to
Michael A. Terrell

diam.

the

0.7mm to

A possible common feature. Certainly with the recent one and IIRC the previous one, the errant joints were where there had been beefing up over the traces to increase current capacity. That process having been done after the full component solder process as any cones were destroyed.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

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