Electronics > Repair
Manson HCS-3602 Power Supply lost its values. (HCS-3600 series)
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Wollvieh:
I saved a Manson HCS-3602 from the dumpster. Labelled as Peaktech P1580, but that doesn't change much.
Manson Manual attached.
Technically it's in perfect condition, but it does have a software problem. Most likely the stored values are lost.
When powered on, it goes successfully through all tests.
It starts with 0 V, 0 A on the display. Then it says "UuL" or "UcL" when trying to select a voltage or current above 0. According to the Manson manual this means those limits have been set by software and can only be removed the same way.
The provided software doesn't connect. But I managed to connect via hterm and send commands, where the Power Supply answers.
The answer to "GMAX" is "000000", which is bad. Because these are the maximum values of voltage and current the Power supply can deliver. I assume originally this was factory set to the specific type of supply. So this brick now thinks it is a 0 V, 0 A supply. Any command to change voltage or current is only accepted when the value is 000.
The controller I see on the digital board is an Atmega 64A. No other digital chips, especially no EEPROMS.
So no way to set the values or to read them from a different device? Or was Manson so kind to not set the lock bits?
Wollvieh:
Has anyone ever tried to read out the EEPROM of the Atmega 64a in this power supply?
One might assume that all the fuses are set correctly (=putting the µC in an unserviceable state), but you never know.
I have no experience in programming Atmegas, so I'm not sure if I understand the datasheet (which I attached here) correctly:
Table 31-2 on p. 383 says there is a memory lock mode for "further programming of the flash and EEPROM" and another one for "further programming and verification of the flash and EEPROM".
Is the second one the usual one to protect the program? So if the program is protected, the EEPROM is also unreadable? Or is there a fair chance to be able to read the EEPROM and its configuration data?
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