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HPR4222: Replacing backup batteries in my Kenwood TS940S HF Radio Part 5
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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By Hacker Public Radio
4.2
3434 ratings
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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