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What causes the traces to wrinkle like this and should I be worried
Which Apple floppy drive is compatible on both Apple IIc and MacintoshHow did the original Apple Macintosh and Atari ST use protected mode?What is the title of this Macintosh programming book?Was the Mac XL hardware different from the last versions of the Lisa?When did the Macintosh start using four (or more) layer PCB's?What exactly did Sony contribute to the original Apple PowerBook?How was it back then in 1984, when the Apple II had color, and the new Macintosh didn't?When and why would MacinTalk say “open-apple hold”?Dimensioned drawing of 64-pin SIMM?Can you help me identify this AMD 386-DX40 motherboard?
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I have a Macintosh SE in my collection and I noticed these odd looking traces on the mainboard. Not quite sure what to think of it
apple-macintosh motherboard
edited Sep 19 at 21:43
Curt J. Sampson
9,21924 silver badges58 bronze badges
asked Sep 19 at 21:21
yanagibashiyanagibashi
4699 bronze badges
add a comment
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I have a Macintosh SE in my collection and I noticed these odd looking traces on the mainboard. Not quite sure what to think of it
apple-macintosh motherboard
edited Sep 19 at 21:43
Curt J. Sampson
9,21924 silver badges58 bronze badges
asked Sep 19 at 21:21
yanagibashiyanagibashi
4699 bronze badges
4
That's perfectly normal and part of the production process.
– Raffzahn
Sep 19 at 22:20
My Commodore PC looks the same.
– Ziagl
Sep 27 at 9:35
add a comment
|
I have a Macintosh SE in my collection and I noticed these odd looking traces on the mainboard. Not quite sure what to think of it
apple-macintosh motherboard
edited Sep 19 at 21:43
Curt J. Sampson
9,21924 silver badges58 bronze badges
asked Sep 19 at 21:21
yanagibashiyanagibashi
4699 bronze badges
I have a Macintosh SE in my collection and I noticed these odd looking traces on the mainboard. Not quite sure what to think of it
apple-macintosh motherboard
apple-macintosh motherboard
edited Sep 19 at 21:43
Curt J. Sampson
9,21924 silver badges58 bronze badges
asked Sep 19 at 21:21
yanagibashiyanagibashi
4699 bronze badges
edited Sep 19 at 21:43
Curt J. Sampson
9,21924 silver badges58 bronze badges
asked Sep 19 at 21:21
yanagibashiyanagibashi
4699 bronze badges
edited Sep 19 at 21:43
Curt J. Sampson
9,21924 silver badges58 bronze badges
edited Sep 19 at 21:43
Curt J. Sampson
9,21924 silver badges58 bronze badges
edited Sep 19 at 21:43
Curt J. Sampson
9,21924 silver badges58 bronze badges
9,21924 silver badges58 bronze badges
asked Sep 19 at 21:21
yanagibashiyanagibashi
4699 bronze badges
asked Sep 19 at 21:21
yanagibashiyanagibashi
4699 bronze badges
asked Sep 19 at 21:21
yanagibashiyanagibashi
4699 bronze badges
4699 bronze badges
4
That's perfectly normal and part of the production process.
– Raffzahn
Sep 19 at 22:20
My Commodore PC looks the same.
– Ziagl
Sep 27 at 9:35
add a comment
|
4
That's perfectly normal and part of the production process.
– Raffzahn
Sep 19 at 22:20
My Commodore PC looks the same.
– Ziagl
Sep 27 at 9:35
4
4
That's perfectly normal and part of the production process.
– Raffzahn
Sep 19 at 22:20
That's perfectly normal and part of the production process.
– Raffzahn
Sep 19 at 22:20
My Commodore PC looks the same.
– Ziagl
Sep 27 at 9:35
My Commodore PC looks the same.
– Ziagl
Sep 27 at 9:35
add a comment
|
2 Answers
2
active
oldest
votes
They were most likely wrinkled like that from the start, due to the way they were manufactured, and thus you should not be worried.
Until the mid-90s, boards often went through an HASL, or "hot air solder leveling" process that put solder on the traces before the solder mask (a protective layer over the board) was applied. This initial solder over the PCB's copper traces helped avoid corrosion and, when near a point where a component would later be soldered, would help wetting so that the component could be more reliably connected to the PCB trace.
Excess solder on the traces would be removed before the mask was applied, but usually not completely on large traces. So, after being masked, when the board was wave soldered to attach the electronic components, the original HASL solder, now underneath the solder mask, would melt again and reform unevenly under the mask during cooling.
There's a more detailed discussion about this on Reddit.
answered Sep 19 at 21:40
Curt J. SampsonCurt J. Sampson
9,21924 silver badges58 bronze badges
add a comment
|
This is actually a comment, but images cannot be inserted in a comment, so I wrote an "answer", just to point out that this kind of trace looking is already known in other computers, like the ZX Spectrum. AFAIK, this is due to the wave soldering process used.
This is how it looks like on the solder side:
answered Sep 26 at 14:06
mcleod_ideafixmcleod_ideafix
13.7k1 gold badge43 silver badges82 bronze badges
add a comment
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2 Answers
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active
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2 Answers
2
active
oldest
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They were most likely wrinkled like that from the start, due to the way they were manufactured, and thus you should not be worried.
Until the mid-90s, boards often went through an HASL, or "hot air solder leveling" process that put solder on the traces before the solder mask (a protective layer over the board) was applied. This initial solder over the PCB's copper traces helped avoid corrosion and, when near a point where a component would later be soldered, would help wetting so that the component could be more reliably connected to the PCB trace.
Excess solder on the traces would be removed before the mask was applied, but usually not completely on large traces. So, after being masked, when the board was wave soldered to attach the electronic components, the original HASL solder, now underneath the solder mask, would melt again and reform unevenly under the mask during cooling.
There's a more detailed discussion about this on Reddit.
answered Sep 19 at 21:40
Curt J. SampsonCurt J. Sampson
9,21924 silver badges58 bronze badges
add a comment
|
They were most likely wrinkled like that from the start, due to the way they were manufactured, and thus you should not be worried.
Until the mid-90s, boards often went through an HASL, or "hot air solder leveling" process that put solder on the traces before the solder mask (a protective layer over the board) was applied. This initial solder over the PCB's copper traces helped avoid corrosion and, when near a point where a component would later be soldered, would help wetting so that the component could be more reliably connected to the PCB trace.
Excess solder on the traces would be removed before the mask was applied, but usually not completely on large traces. So, after being masked, when the board was wave soldered to attach the electronic components, the original HASL solder, now underneath the solder mask, would melt again and reform unevenly under the mask during cooling.
There's a more detailed discussion about this on Reddit.
answered Sep 19 at 21:40
Curt J. SampsonCurt J. Sampson
9,21924 silver badges58 bronze badges
add a comment
|
They were most likely wrinkled like that from the start, due to the way they were manufactured, and thus you should not be worried.
Until the mid-90s, boards often went through an HASL, or "hot air solder leveling" process that put solder on the traces before the solder mask (a protective layer over the board) was applied. This initial solder over the PCB's copper traces helped avoid corrosion and, when near a point where a component would later be soldered, would help wetting so that the component could be more reliably connected to the PCB trace.
Excess solder on the traces would be removed before the mask was applied, but usually not completely on large traces. So, after being masked, when the board was wave soldered to attach the electronic components, the original HASL solder, now underneath the solder mask, would melt again and reform unevenly under the mask during cooling.
There's a more detailed discussion about this on Reddit.
answered Sep 19 at 21:40
Curt J. SampsonCurt J. Sampson
9,21924 silver badges58 bronze badges
They were most likely wrinkled like that from the start, due to the way they were manufactured, and thus you should not be worried.
Until the mid-90s, boards often went through an HASL, or "hot air solder leveling" process that put solder on the traces before the solder mask (a protective layer over the board) was applied. This initial solder over the PCB's copper traces helped avoid corrosion and, when near a point where a component would later be soldered, would help wetting so that the component could be more reliably connected to the PCB trace.
Excess solder on the traces would be removed before the mask was applied, but usually not completely on large traces. So, after being masked, when the board was wave soldered to attach the electronic components, the original HASL solder, now underneath the solder mask, would melt again and reform unevenly under the mask during cooling.
There's a more detailed discussion about this on Reddit.
answered Sep 19 at 21:40
Curt J. SampsonCurt J. Sampson
9,21924 silver badges58 bronze badges
answered Sep 19 at 21:40
Curt J. SampsonCurt J. Sampson
9,21924 silver badges58 bronze badges
answered Sep 19 at 21:40
Curt J. SampsonCurt J. Sampson
9,21924 silver badges58 bronze badges
answered Sep 19 at 21:40
Curt J. SampsonCurt J. Sampson
9,21924 silver badges58 bronze badges
9,21924 silver badges58 bronze badges
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add a comment
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This is actually a comment, but images cannot be inserted in a comment, so I wrote an "answer", just to point out that this kind of trace looking is already known in other computers, like the ZX Spectrum. AFAIK, this is due to the wave soldering process used.
This is how it looks like on the solder side:
answered Sep 26 at 14:06
mcleod_ideafixmcleod_ideafix
13.7k1 gold badge43 silver badges82 bronze badges
add a comment
|
This is actually a comment, but images cannot be inserted in a comment, so I wrote an "answer", just to point out that this kind of trace looking is already known in other computers, like the ZX Spectrum. AFAIK, this is due to the wave soldering process used.
This is how it looks like on the solder side:
answered Sep 26 at 14:06
mcleod_ideafixmcleod_ideafix
13.7k1 gold badge43 silver badges82 bronze badges
add a comment
|
This is actually a comment, but images cannot be inserted in a comment, so I wrote an "answer", just to point out that this kind of trace looking is already known in other computers, like the ZX Spectrum. AFAIK, this is due to the wave soldering process used.
This is how it looks like on the solder side:
answered Sep 26 at 14:06
mcleod_ideafixmcleod_ideafix
13.7k1 gold badge43 silver badges82 bronze badges
This is actually a comment, but images cannot be inserted in a comment, so I wrote an "answer", just to point out that this kind of trace looking is already known in other computers, like the ZX Spectrum. AFAIK, this is due to the wave soldering process used.
This is how it looks like on the solder side:
answered Sep 26 at 14:06
mcleod_ideafixmcleod_ideafix
13.7k1 gold badge43 silver badges82 bronze badges
answered Sep 26 at 14:06
mcleod_ideafixmcleod_ideafix
13.7k1 gold badge43 silver badges82 bronze badges
answered Sep 26 at 14:06
mcleod_ideafixmcleod_ideafix
13.7k1 gold badge43 silver badges82 bronze badges
answered Sep 26 at 14:06
mcleod_ideafixmcleod_ideafix
13.7k1 gold badge43 silver badges82 bronze badges
13.7k1 gold badge43 silver badges82 bronze badges
add a comment
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add a comment
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4
That's perfectly normal and part of the production process.
– Raffzahn
Sep 19 at 22:20
My Commodore PC looks the same.
– Ziagl
Sep 27 at 9:35