What causes the traces to wrinkle like this and should I be worriedWhich 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?Old multimedia: Monochrome Macintosh / Laserdisc playerWhen 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?
Safely hang a mirror that does not have hooks
Could Apollo astronauts see city lights from the moon?
Examples of "unsuccessful" theories with afterlives
Counting most common combination of values in dataframe column
My 15 year old son is gay. How do I express my feelings about this?
What do you do if you have developments on your paper during the long peer review process?
Social leper versus social leopard
Meaning of 'ran' in German?
The quicker I go up, the sooner I’ll go down - Riddle
Why is the missed-approach course for the "RNAV (GNSS) - A" approach to runway 28 at ENSB shaped all funny?
Will Proving or Disproving of any of the following have effects on Chemistry in general?
Is this a Sherman, and if so what model?
How do I deal with too many NPCs in my campaign?
Wrong result by FindRoot
What is the meaning of "heutig" in this sentence?
Why does NASA publish all the results/data it gets?
I reverse the source code, you negate the input!
Who created the Lightning Web Component?
What are these ingforms of learning?
Is it true that, "just ten trading days represent 63 per cent of the returns of the past 50 years"?
Is it possible to constructively prove that every quaternion has a square root?
A drug that allows people to survive on less food
Conditionally execute a command if a specific package is loaded
How use custom order in folder on Windows 7 and 10
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?Old multimedia: Monochrome Macintosh / Laserdisc playerWhen 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?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
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 8 hours ago
Curt J. Sampson
4,94613 silver badges44 bronze badges
asked 8 hours ago
yanagibashiyanagibashi
1156 bronze badges
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 8 hours ago
Curt J. Sampson
4,94613 silver badges44 bronze badges
asked 8 hours ago
yanagibashiyanagibashi
1156 bronze badges
2
That's perfectly normal and part of the production process.
– Raffzahn
7 hours ago
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 8 hours ago
Curt J. Sampson
4,94613 silver badges44 bronze badges
asked 8 hours ago
yanagibashiyanagibashi
1156 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 8 hours ago
Curt J. Sampson
4,94613 silver badges44 bronze badges
asked 8 hours ago
yanagibashiyanagibashi
1156 bronze badges
edited 8 hours ago
Curt J. Sampson
4,94613 silver badges44 bronze badges
asked 8 hours ago
yanagibashiyanagibashi
1156 bronze badges
edited 8 hours ago
Curt J. Sampson
4,94613 silver badges44 bronze badges
edited 8 hours ago
Curt J. Sampson
4,94613 silver badges44 bronze badges
edited 8 hours ago
Curt J. Sampson
4,94613 silver badges44 bronze badges
4,94613 silver badges44 bronze badges
asked 8 hours ago
yanagibashiyanagibashi
1156 bronze badges
asked 8 hours ago
yanagibashiyanagibashi
1156 bronze badges
asked 8 hours ago
yanagibashiyanagibashi
1156 bronze badges
1156 bronze badges
2
That's perfectly normal and part of the production process.
– Raffzahn
7 hours ago
add a comment
|
2
That's perfectly normal and part of the production process.
– Raffzahn
7 hours ago
2
2
That's perfectly normal and part of the production process.
– Raffzahn
7 hours ago
That's perfectly normal and part of the production process.
– Raffzahn
7 hours ago
add a comment
|
1 Answer
1
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 8 hours ago
Curt J. SampsonCurt J. Sampson
4,94613 silver badges44 bronze badges
add a comment
|
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "648"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/4.0/"u003ecc by-sa 4.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fretrocomputing.stackexchange.com%2fquestions%2f12356%2fwhat-causes-the-traces-to-wrinkle-like-this-and-should-i-be-worried%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
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 8 hours ago
Curt J. SampsonCurt J. Sampson
4,94613 silver badges44 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 8 hours ago
Curt J. SampsonCurt J. Sampson
4,94613 silver badges44 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 8 hours ago
Curt J. SampsonCurt J. Sampson
4,94613 silver badges44 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 8 hours ago
Curt J. SampsonCurt J. Sampson
4,94613 silver badges44 bronze badges
answered 8 hours ago
Curt J. SampsonCurt J. Sampson
4,94613 silver badges44 bronze badges
answered 8 hours ago
Curt J. SampsonCurt J. Sampson
4,94613 silver badges44 bronze badges
answered 8 hours ago
Curt J. SampsonCurt J. Sampson
4,94613 silver badges44 bronze badges
4,94613 silver badges44 bronze badges
add a comment
|
add a comment
|
Thanks for contributing an answer to Retrocomputing Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fretrocomputing.stackexchange.com%2fquestions%2f12356%2fwhat-causes-the-traces-to-wrinkle-like-this-and-should-i-be-worried%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
2
That's perfectly normal and part of the production process.
– Raffzahn
7 hours ago