1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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19,366 Posts
The earlier mileage storage ICs were in a socket for quick swaps. Later ones were soldered in for tamper-resistance and the depots did the repairs on them for that. There may be printing on the circuit board identifying the chip.
Components and schematics are copyrighted Chrysler information that is available to the authorized radio/cluster repair depots for their reference only. United Radio is the depot in our area. It is not public information (yet), but once in a while something 'secret' shows up on the internet temporarily. It can be quickly taken down, so download it if you see it. GM Delco/Delphi and Ford Motorcraft electronics are the same way.
It helps if you know someone at such a facility. Of course, things this old are no longer supported parts or service-wise, but you may find someone willing to help you if it is within their power and they have an appreciation for old things.
A cap can still have high ESR (leakage) without any external signs. A leaky cap will add load to 12v DC-to-22v DC converters and can damage them. The VFD tubes run around 22 volts at a low current to light them. The life of an electrolytic cap usually a safe ~20 years, but can vary widely depending on its duty or quality, etc.
Components and schematics are copyrighted Chrysler information that is available to the authorized radio/cluster repair depots for their reference only. United Radio is the depot in our area. It is not public information (yet), but once in a while something 'secret' shows up on the internet temporarily. It can be quickly taken down, so download it if you see it. GM Delco/Delphi and Ford Motorcraft electronics are the same way.
It helps if you know someone at such a facility. Of course, things this old are no longer supported parts or service-wise, but you may find someone willing to help you if it is within their power and they have an appreciation for old things.
A cap can still have high ESR (leakage) without any external signs. A leaky cap will add load to 12v DC-to-22v DC converters and can damage them. The VFD tubes run around 22 volts at a low current to light them. The life of an electrolytic cap usually a safe ~20 years, but can vary widely depending on its duty or quality, etc.