D
Dave VanHorn
Where do you get that idea?
Where do you get that idea?
D
Dave VanHorn
References on cleaning PCBs with water.
http://www.engineeringlab.com/cleaningbatch.html
http://www.circuittechctr.com/guides/2-2-1.shtml
http://www.engineeringlab.com/cleaningbatch.html
http://www.circuittechctr.com/guides/2-2-1.shtml
P
Papa
Whose post are you responding to?
B
Bullwinkle. J. Moose
My problem has been that the clock on my dashboard keeps getting stuck at
April first. But after reading this exchange I now realize the clock is
correct.
April first. But after reading this exchange I now realize the clock is
correct.
H
Hello World
Summary: Background information on how printed circuit boards (PCBs) are
constructed.
PCBs consist of a number of electrical and non-electrical layers. 2 to 4
electrical layers are fairly common for simple circuit boards. 8 to 20
layers can often be seen in many industry applications. A fiberglass or
epoxy resin dielectric material separates each of the layers.
There are also several non-electrical layers:
a.. Drill Layer - This layer defines finished drill sizes and drill
locations for parts that have pins that go through the board. It is also
used for general documentation.
b.. Solder Mask - There is a coating on the top and bottom of the PCB that
prevents solder from flowing freely on the board. This is what gives most
circuit boards their green color.
c.. Solder Paste - For parts that are 'surface mount' (the pins rest on
the surface of the board and do not go through it) this layer defines the
spaces where solder (in a paste form) will be applied for circuit assembly.
This layer is not used for manufacturing and is only used by the person
assembling the board.
d.. Silkscreen - This layer is used for documentation of a PCB. Reference
designators and other useful text can be printed on the top or bottom of a
PCB using a process similar to that used for silkscreen t-shirts.
constructed.
PCBs consist of a number of electrical and non-electrical layers. 2 to 4
electrical layers are fairly common for simple circuit boards. 8 to 20
layers can often be seen in many industry applications. A fiberglass or
epoxy resin dielectric material separates each of the layers.
There are also several non-electrical layers:
a.. Drill Layer - This layer defines finished drill sizes and drill
locations for parts that have pins that go through the board. It is also
used for general documentation.
b.. Solder Mask - There is a coating on the top and bottom of the PCB that
prevents solder from flowing freely on the board. This is what gives most
circuit boards their green color.
c.. Solder Paste - For parts that are 'surface mount' (the pins rest on
the surface of the board and do not go through it) this layer defines the
spaces where solder (in a paste form) will be applied for circuit assembly.
This layer is not used for manufacturing and is only used by the person
assembling the board.
d.. Silkscreen - This layer is used for documentation of a PCB. Reference
designators and other useful text can be printed on the top or bottom of a
PCB using a process similar to that used for silkscreen t-shirts.
Y
Yves Leclerc
And "tap" water is full of minerals. Have you ever seen th inside of a
water kettle? See all the mineral deposits?
water kettle? See all the mineral deposits?
E
Electronics Repair Man
I work in the field of Electronics, work on all types of boards, mainly
Video / Audio boards and also Motherboards for Computers.
Years ago we use to wash the boards in a oil bath solution then a de-ionized
solution to clean then and still today this method is sometimes used. It
does not hard the board, you must make sure that the board is throughly dry
before using them. Also, if if you sockets that can be remove, it is
recommended you remove them because water will be trapped and have a harder
time to evaporate. We usually had a drying time of 2 days before any power
is applied.
Alcohol is not recommed because it could cause the plastic to melt.
Isoproponol is a good cleaning solution. Vacuums with a soft painters brush
and Compressed air in a can can cause static build up but if you are
discharging yourself on a regular basis, this method is acceptable. When
there is air movement at high velocities, static buildup generates very
rapidly.
I have seen small fires and smoke created by dust. Dust is a very flammable
material. The most dangerous spot for dust is the power supply which must
people neglect to clean throughly. It gets very hot and is usually where
fire breaks out.
In my computer I have filters to minimize dust entering into the case. It
does restrict the movement of air. With the air filter installed, it helps
minimizing fan noise. Also I do not like those 12V fans so I hardwire a 110
DC Volts fan, has better air movement and more reliable. The noise of a 110
DC Volt fans is about the same, just make sure it runs on ball bearings. The
CPU fans I do not change.
Video / Audio boards and also Motherboards for Computers.
Years ago we use to wash the boards in a oil bath solution then a de-ionized
solution to clean then and still today this method is sometimes used. It
does not hard the board, you must make sure that the board is throughly dry
before using them. Also, if if you sockets that can be remove, it is
recommended you remove them because water will be trapped and have a harder
time to evaporate. We usually had a drying time of 2 days before any power
is applied.
Alcohol is not recommed because it could cause the plastic to melt.
Isoproponol is a good cleaning solution. Vacuums with a soft painters brush
and Compressed air in a can can cause static build up but if you are
discharging yourself on a regular basis, this method is acceptable. When
there is air movement at high velocities, static buildup generates very
rapidly.
I have seen small fires and smoke created by dust. Dust is a very flammable
material. The most dangerous spot for dust is the power supply which must
people neglect to clean throughly. It gets very hot and is usually where
fire breaks out.
In my computer I have filters to minimize dust entering into the case. It
does restrict the movement of air. With the air filter installed, it helps
minimizing fan noise. Also I do not like those 12V fans so I hardwire a 110
DC Volts fan, has better air movement and more reliable. The noise of a 110
DC Volt fans is about the same, just make sure it runs on ball bearings. The
CPU fans I do not change.
D
Dave VanHorn
And distilled water, which is what I specified, has NONE OF THAT.
N
namniar
Electronics Repair Man,
I was interested in your comments about the 120 volt DC case fans. I was
considering using 120 volt AC case fans but I was not sure how the
motherboard and other components of the desktop PC would react to EMF(?)
from the wiring. I figured something like this might be a good option for
those of us with marginal power supplies and requiring more air flow. Your
comments (and others as well of course)?
r.
I was interested in your comments about the 120 volt DC case fans. I was
considering using 120 volt AC case fans but I was not sure how the
motherboard and other components of the desktop PC would react to EMF(?)
from the wiring. I figured something like this might be a good option for
those of us with marginal power supplies and requiring more air flow. Your
comments (and others as well of course)?
r.
E
Electronics Repair Man
About my last post, I actually meant AC not DC.
This should of read, It does restrict air movement but it isn't significant.
The Electric Magnetic Force (EMF) is nothing to worry about, since most
component are shielded from this. And the EMF isn't really significant.
I hardwire the fan directly in the Power Supply (550W) where the power comes
into the power supply after the power supply switch. So when turning off the
Power supply, the fan would power down. Also when the Computer goes into
Standby the fan will still run but I do not mind this at all because the CPU
atcually climbs in temparature for a few minutes when powering down due to
the CPU fan not running after entering Standby mode. I used a 4" Fan, but
mounting it was not that difficult. I had to drill 4 holes to mount the fan
correctly. Usually inside a PC case you use a 3" fan. The filter is a must
because alot of dust will travel with air flow. The filter should be cleaned
a regular basis due to the increase of dust. I have found the temperatures
for the System is usually around 28 Celcius instead of 30 to 35 Celcius. The
cooler the system, the more stable the computer will be.
I have always wonder why manufacturers do not use this option. These fans
tend not to fail as often.
We use 110 V AC fans all the time in many electronic equipment, like Video
Receivers/Transmitters for Cable providers and Audio components. The EMF is
not a issue, they do not cause interference to components. And in these
components, there are many microprocessors to process data and encode them
into transmitable signals or to decode signals.
If you have specific questions or details feel free to ask me. I rarely
check my hotmail account due to SPAM. Just post here and I will answer as
quickly as I can.
This should of read, It does restrict air movement but it isn't significant.
The Electric Magnetic Force (EMF) is nothing to worry about, since most
component are shielded from this. And the EMF isn't really significant.
I hardwire the fan directly in the Power Supply (550W) where the power comes
into the power supply after the power supply switch. So when turning off the
Power supply, the fan would power down. Also when the Computer goes into
Standby the fan will still run but I do not mind this at all because the CPU
atcually climbs in temparature for a few minutes when powering down due to
the CPU fan not running after entering Standby mode. I used a 4" Fan, but
mounting it was not that difficult. I had to drill 4 holes to mount the fan
correctly. Usually inside a PC case you use a 3" fan. The filter is a must
because alot of dust will travel with air flow. The filter should be cleaned
a regular basis due to the increase of dust. I have found the temperatures
for the System is usually around 28 Celcius instead of 30 to 35 Celcius. The
cooler the system, the more stable the computer will be.
I have always wonder why manufacturers do not use this option. These fans
tend not to fail as often.
We use 110 V AC fans all the time in many electronic equipment, like Video
Receivers/Transmitters for Cable providers and Audio components. The EMF is
not a issue, they do not cause interference to components. And in these
components, there are many microprocessors to process data and encode them
into transmitable signals or to decode signals.
If you have specific questions or details feel free to ask me. I rarely
check my hotmail account due to SPAM. Just post here and I will answer as
quickly as I can.
N
namniar
Electronics Repair Man,
Quote:
"I hardwire the fan directly in the Power Supply (550W) where the power
comes
into the power supply after the power supply switch. So when turning off the
Power supply, the fan would power down." - That is exactly what I was
planning on doing as well.
Thank you for the great info.
r.
Quote:
"I hardwire the fan directly in the Power Supply (550W) where the power
comes
into the power supply after the power supply switch. So when turning off the
Power supply, the fan would power down." - That is exactly what I was
planning on doing as well.
Thank you for the great info.
r.
E
Electronics Repair Man
You are most certainly welcome.
N
Nathan McNulty
Distilled is the process of taking those impurities out of the water 