Hi there, funny to see that this is a device that is found mainly in France
For those who do not know AOIP, it was a famous French company 'owned' by employees themselves (a SCOP), hence the name AOIP, for Association des Ouvriers en Instruments de Précision. They were famous in telephony, and in resistor standards in 60's ('Pots AOIP' as we said). Unlike Adret, they still exist. That's all for the story
I too have a PJN5208D - I'm in France too. Apart the rough design - an OKW box with a keypad on it, it is an excellent process calibrator. Everything in these devices can be replaced, unlike ASICs found in most devices. Apart the keyboard, of course.
To come back to the topic, you just need to replace batteries, since message 'Mémoire perdue' (lost memory) is related to user RAM, and this message is common to all these devices when power is lost (newer devices, like Calys-5 behave same way - apart that user RAM is stored in a DS1230).
IIRC, you don't need serial, since this memory is used to store your values and ramps. Calibration data is stored in an EEPROM. All values and ramps are entered thru keyboard (if it can be given the name of 'keyboard'). But il case you'd like to, serial comm. is performed from the 3.5mm jack, having just GND.TxD and RxD connected. If you haven't the option fitted, do it yourself, by soldering pads 2 & 3, and by adding an LT1080 and few components. Note: when you replace batteries, be careful if you solder tabs to your new batteries - not recommended since batteries may explode due to excessive heat applied with your soldering iron. And the 2+1 pins tabs used are quite uncommon ...
You can find attached document showing you schematics of digital board (I scanned a long ago the manual too if needed). Enjoy !
(Note : sorry to resurrect such an old thread, but it may help others having that device too
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