Restoring 1220, 1225 and 1230 keypad: Difference between revisions
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[[Image:Bounce(1).jpg|thumb|left|250px|(Pic1) "Bouncing" switch, the second trace is the signal coming out of a [[Schmitt trigger]].]] | [[Image:Bounce(1).jpg|thumb|left|250px|(Pic1) "Bouncing" switch, the second trace is the signal coming out of a [[Schmitt trigger]].]] | ||
[[Image:Bounce(2).jpg|thumb|right|250px|(Pic2) Registered presses being sent to the LA.]] | [[Image:Bounce(2).jpg|thumb|right|250px|(Pic2) Registered presses being sent to the LA.]] | ||
The [[1220]], [[1225]] and [[1230]] have a keypad interface for controlling them. The switches are tactile switches with a small spring. Over time they start to become extremely "bouncy". This is due to a number of factors, some including corrosion and weakening springs. Over time this will lead to problems such as the keypad being less responsive and the analyzer registering multiple presses. | *The [[1220]], [[1225]] and [[1230]] have a keypad interface for controlling them. The switches are tactile switches with a small spring. Over time they start to become extremely "bouncy". This is due to a number of factors, some including corrosion and weakening springs. Over time this will lead to problems such as the keypad being less responsive and the analyzer registering multiple presses. | ||
Picture 1 shows what the keypad is registering. | Picture 1 shows what the keypad is registering. | ||
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[[Image:Bounce(4).jpg|thumb|left|250px|(Pic3) Keypad switches]] | [[Image:Bounce(4).jpg|thumb|left|250px|(Pic3) Keypad switches]] | ||
[[Image:Bounce(5).jpg|thumb|right|250px|(Pic4) Keypad switches]] | [[Image:Bounce(5).jpg|thumb|right|250px|(Pic4) Keypad switches]] | ||
The switches that the keypad uses are still being manufactured today. They are C&K D6L90F1LFS. There is also the D6L90F2LFS, they are the exact same except the force required to push the buttons. One takes 1.3 Newtons and the other 2 Newtons (Pic3). The key pad has 26 of them. Replacing them with new ones will fix the excessive bouncing. When de-soldering the switches one has to be careful of burning the PCB and lifting pads because the traces are very small. | * '''WARNING!''' When taking the analyzer apart, users are at there own risk! The inside contains lethal voltages and precaution must be taken. | ||
*The switches that the keypad uses are still being manufactured today. They are C&K D6L90F1LFS. There is also the D6L90F2LFS, they are the exact same except the force required to push the buttons. One takes 1.3 Newtons and the other 2 Newtons (Pic3). The key pad has 26 of them. Replacing them with new ones will fix the excessive bouncing. When de-soldering the switches one has to be careful of burning the PCB and lifting pads because the traces are very small. | |||
:→ [[Media:D6L90F1LFS.pdf|Datasheet for D6L90F1LFS and D6L90F2LFS ]] | :→ [[Media:D6L90F1LFS.pdf|Datasheet for D6L90F1LFS and D6L90F2LFS ]] | ||
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==Conclusion== | ==Conclusion== | ||
[[Image:Bounce(3).jpg|thumb|left|250px|(Pic5) Restored keypad.]] | [[Image:Bounce(3).jpg|thumb|left|250px|(Pic5) Restored keypad.]] | ||
It is not known how long this fix will last, but it makes the unit usable again. After the replacement the signal is now clean after replacing the switches (Pic5). | * It is not known how long this fix will last, but it makes the unit usable again. After the replacement the signal is now clean after replacing the switches (Pic5). | ||
[[Category:Repair issues]] | [[Category:Repair issues]] | ||
Revision as of 20:16, 5 May 2019
Description
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.jpg)
- The 1220, 1225 and 1230 have a keypad interface for controlling them. The switches are tactile switches with a small spring. Over time they start to become extremely "bouncy". This is due to a number of factors, some including corrosion and weakening springs. Over time this will lead to problems such as the keypad being less responsive and the analyzer registering multiple presses.
Picture 1 shows what the keypad is registering.
Fix
.jpg)
.jpg)
- WARNING! When taking the analyzer apart, users are at there own risk! The inside contains lethal voltages and precaution must be taken.
- The switches that the keypad uses are still being manufactured today. They are C&K D6L90F1LFS. There is also the D6L90F2LFS, they are the exact same except the force required to push the buttons. One takes 1.3 Newtons and the other 2 Newtons (Pic3). The key pad has 26 of them. Replacing them with new ones will fix the excessive bouncing. When de-soldering the switches one has to be careful of burning the PCB and lifting pads because the traces are very small.
Conclusion
.jpg)
- It is not known how long this fix will last, but it makes the unit usable again. After the replacement the signal is now clean after replacing the switches (Pic5).