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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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keyboard plastic PCB repair?
Hello folks,
did anyone suceeded in repairing traces on that old plastic sheet printed circuits keyboards? Some traces are interrupted and it's impossible to solder on that kind of plastic/trace combination. I've had some success on plastic substrate when the tracks were copper strips of sufficient thickness, but in this case they looks like black conductive material and the plastic substrate is so thin that any tip at a useful temperature for soldering instantly makes a hole. I've been thinking about conductive glue, but it might not stick or make a good contact. So if anyone already had experience (positive or negative) is very welcome. It's a 30 years old mitsumy custom keyboard, so not replaceable with something modern. Thanks Frank |
#2
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keyboard plastic PCB repair?
On Wednesday, March 8, 2017 at 12:56:22 PM UTC-5, frank wrote:
Hello folks, did anyone suceeded in repairing traces on that old plastic sheet printed circuits keyboards? Some traces are interrupted and it's impossible to solder on that kind of plastic/trace combination. I've had some success on plastic substrate when the tracks were copper strips of sufficient thickness, but in this case they looks like black conductive material and the plastic substrate is so thin that any tip at a useful temperature for soldering instantly makes a hole. I've been thinking about conductive glue, but it might not stick or make a good contact. So if anyone already had experience (positive or negative) is very welcome. It's a 30 years old mitsumy custom keyboard, so not replaceable with something modern. Thanks Frank Get a Circuit Writer pen from Caig labs. I've tried using black conductive paint from several sources and it's not conductive enough. |
#3
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keyboard plastic PCB repair?
Try this :
https://www.chemtronics.com/c-275-ci...-and-inks.aspx. It is magic. frank a écrit : Hello folks, did anyone suceeded in repairing traces on that old plastic sheet printed circuits keyboards? Some traces are interrupted and it's impossible to solder on that kind of plastic/trace combination. I've had some success on plastic substrate when the tracks were copper strips of sufficient thickness, but in this case they looks like black conductive material and the plastic substrate is so thin that any tip at a useful temperature for soldering instantly makes a hole. I've been thinking about conductive glue, but it might not stick or make a good contact. So if anyone already had experience (positive or negative) is very welcome. It's a 30 years old mitsumy custom keyboard, so not replaceable with something modern. Thanks Frank |
#4
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keyboard plastic PCB repair?
At +/- $12.50 per pen, it is going to be cheaper than a new board in very nearly every case.
Peter Wieck Melrose Park, PA |
#5
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keyboard plastic PCB repair?
On 08/03/2017 17:53, frank wrote:
Hello folks, did anyone suceeded in repairing traces on that old plastic sheet printed circuits keyboards? Some traces are interrupted and it's impossible to solder on that kind of plastic/trace combination. I've had some success on plastic substrate when the tracks were copper strips of sufficient thickness, but in this case they looks like black conductive material and the plastic substrate is so thin that any tip at a useful temperature for soldering instantly makes a hole. I've been thinking about conductive glue, but it might not stick or make a good contact. So if anyone already had experience (positive or negative) is very welcome. It's a 30 years old mitsumy custom keyboard, so not replaceable with something modern. Thanks Frank I've used "Tempest-proof" RFI blocking, nickel spray . After shaking the aerosol can , squirt some into a small container and paint on with a toothpick, good low ohmage |
#6
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keyboard plastic PCB repair?
On Wednesday, March 8, 2017 at 2:47:19 PM UTC-5, N_Cook wrote:
I've used "Tempest-proof" RFI blocking, nickel spray . After shaking the aerosol can , squirt some into a small container and paint on with a toothpick, good low ohmage. True, but nickel is very hard to solder. Silver is not. The former when soldering is necessary, the latter when not. Peter Wieck Melrose Park, PA |
#7
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keyboard plastic PCB repair?
On Wed, 8 Mar 2017 17:53:31 -0000 (UTC), frank
wrote: Hello folks, did anyone suceeded in repairing traces on that old plastic sheet printed circuits keyboards? Some traces are interrupted and it's impossible to solder on that kind of plastic/trace combination. I've had some success on plastic substrate when the tracks were copper strips of sufficient thickness, but in this case they looks like black conductive material and the plastic substrate is so thin that any tip at a useful temperature for soldering instantly makes a hole. I've been thinking about conductive glue, but it might not stick or make a good contact. So if anyone already had experience (positive or negative) is very welcome. It's a 30 years old mitsumy custom keyboard, so not replaceable with something modern. Thanks Frank I have no idea what that keyboard looks like, but all keyboards can be taken apart and the cord is plugged into the board inside of it. Maybe you can use your old cord on a modern keyboard. Just a thought! |
#8
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keyboard plastic PCB repair?
The chemtronic CW2200 is a very good conductor and you can ssolder on it.
frank a écrit : Hello folks, did anyone suceeded in repairing traces on that old plastic sheet printed circuits keyboards? Some traces are interrupted and it's impossible to solder on that kind of plastic/trace combination. I've had some success on plastic substrate when the tracks were copper strips of sufficient thickness, but in this case they looks like black conductive material and the plastic substrate is so thin that any tip at a useful temperature for soldering instantly makes a hole. I've been thinking about conductive glue, but it might not stick or make a good contact. So if anyone already had experience (positive or negative) is very welcome. It's a 30 years old mitsumy custom keyboard, so not replaceable with something modern. Thanks Frank |
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