{"id":1229,"date":"2018-12-26T21:35:21","date_gmt":"2018-12-27T05:35:21","guid":{"rendered":"http:\/\/wonghoi.humgar.com\/blog\/?p=1229"},"modified":"2018-12-26T21:36:02","modified_gmt":"2018-12-27T05:36:02","slug":"infiniium-front-panel-keypad-54810-66504-2-channels-vs-4-channels","status":"publish","type":"post","link":"https:\/\/wonghoi.humgar.com\/blog\/2018\/12\/26\/infiniium-front-panel-keypad-54810-66504-2-channels-vs-4-channels\/","title":{"rendered":"Infiniium front panel keypad 54810-66504 (2 channels vs 4 channels)"},"content":{"rendered":"

54810 series (first generation) Infiniium uses the same PCB for 2 channels and 4 channel models. They slap on a different rubber keypad sheet and the button labels depending on whether it’s a 2 channel or 4 channel model.<\/p>\n

I received a 4-channel front panel keypad module that was ruined by ripped pads around the relay while trying to replace it. Instead of trying to fix it, I transferred the rotary encoders to a 2 channel PCB which are in abundance, and I noticed this:<\/p>\n

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It seems like HP\/Agilent at some point tried to save a few pennies by skipping the SMD grains (resistors, capacitors, inductors, transistors, diodes) surrounding Channel 3 and 4 for the newer board on the right.<\/p>\n

So if you are looking to repair a 4 channel front panel keypad with 2 channel PCB, you should preferentially select ones from the older lot which has all the parts for 4 channels populated except the rotary encoders. If not, time to get a pair of SMD hot tweezers and transfer the grains one by one.<\/p>\n

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54810 series (first generation) Infiniium uses the same PCB for 2 channels and 4 channel models. They slap on a different rubber keypad sheet and the button labels depending on whether it’s a 2 channel or 4 channel model. I … Continue reading →<\/span><\/a><\/p>\n

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