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HPR4222: Replacing backup batteries in my Kenwood TS940S HF Radio Part 5
MP3•Beranda episode
Manage episode 446215563 series 108988
Konten disediakan oleh HPR Volunteer and Hacker Public Radio. Semua konten podcast termasuk episode, grafik, dan deskripsi podcast diunggah dan disediakan langsung oleh HPR Volunteer and Hacker Public Radio atau mitra platform podcast mereka. Jika Anda yakin seseorang menggunakan karya berhak cipta Anda tanpa izin, Anda dapat mengikuti proses yang diuraikan di sini https://id.player.fm/legal.
Picture 1 Shows the EPROM (Erasable Programmable Read Only Memory) fitted with a label marked JAF7. EPROM's can be erased by removing the sticker and exposing the device to strong ultraviolet light. I incorrectly refer to it as a PROM (Programmable Read Only Memory. Below it is the old leaking PLL backup battery. Wikipedia article about EPROM’s (Erasable Programmable Read Only Memory) Link / example of a Fluke 77 DMM (Digital Multi Meter) I mention that I used it to check the battery voltage of the original PLL backup battery which I think was manufactured around 1984. I was very surprised to find that the battery which is likely 40 years old had a battery voltage of 3.2V which is a healthy voltage. The battery still needed changed due to liquid (probably acid) which can be seen in picture 1 being present on the top surface of the battery. Picture 2 Shows me extending the new battery terminal using the leg of a 1.8 kilo ohm resistor. Note that the resistor leg is shiny because this time I scraped away the surface oxidation using pliers prior to soldering it in place. This improves the final solder joint. I mention I have an EC2000 Weller Electronically controlled soldering station. Here is a link to an example I found
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4251 episode
MP3•Beranda episode
Manage episode 446215563 series 108988
Konten disediakan oleh HPR Volunteer and Hacker Public Radio. Semua konten podcast termasuk episode, grafik, dan deskripsi podcast diunggah dan disediakan langsung oleh HPR Volunteer and Hacker Public Radio atau mitra platform podcast mereka. Jika Anda yakin seseorang menggunakan karya berhak cipta Anda tanpa izin, Anda dapat mengikuti proses yang diuraikan di sini https://id.player.fm/legal.
Picture 1 Shows the EPROM (Erasable Programmable Read Only Memory) fitted with a label marked JAF7. EPROM's can be erased by removing the sticker and exposing the device to strong ultraviolet light. I incorrectly refer to it as a PROM (Programmable Read Only Memory. Below it is the old leaking PLL backup battery. Wikipedia article about EPROM’s (Erasable Programmable Read Only Memory) Link / example of a Fluke 77 DMM (Digital Multi Meter) I mention that I used it to check the battery voltage of the original PLL backup battery which I think was manufactured around 1984. I was very surprised to find that the battery which is likely 40 years old had a battery voltage of 3.2V which is a healthy voltage. The battery still needed changed due to liquid (probably acid) which can be seen in picture 1 being present on the top surface of the battery. Picture 2 Shows me extending the new battery terminal using the leg of a 1.8 kilo ohm resistor. Note that the resistor leg is shiny because this time I scraped away the surface oxidation using pliers prior to soldering it in place. This improves the final solder joint. I mention I have an EC2000 Weller Electronically controlled soldering station. Here is a link to an example I found
…
continue reading
4251 episode
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