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Yes, the RTC is on the processor board and gets power through the connector to the SRAM board where the battery is located.? When the SRAM card is removed, you lose the time.
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Regardless of the super-cap and any other optional external battery backup steps, I would also recommend going through the calibration constants backup procedure described in the Assembly-Level Repair manual, chpt. 3.? It only take s a few minutes to write down the constants.? If you make a mistake with the battery, your future self will thank you.
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It's also possible to record and recover the cal constants from the output of the GPIB command "CAL DUMP", if you have a PC with a GPIB interface.
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-mark
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On Thu, Apr 3, 2025 at 06:01 PM, Ozan wrote:
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On Thu, Apr 3, 2025 at 10:24 AM, KB2LMN wrote:
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I assume you already found service manual sheet with all the data to be copied to paper for insurance. There is a super capacitor on the battery board, if it is still good it lasts long enough to desolder/solder the battery. For extra safety you can solder a parallel 3V battery with 10k-ohm in series. I think date/time is kept on a different board and it will be lost so don't be concerned if you see date to be wrong after battery change.
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Ozan
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KB2LMN