chris1uk

also the speakers fail on these machines, so worth a swap after checking volume level using refill key. I believe its an mpu5 machine ? if so volume is accessed with doors open and refill key turned the 3 buttons on right control the menus

I could be mistaken but from memory these were switchable on original software have you tried changing stake key settings ?

then time to take the resin off and reverse those dongles

I'm suprised that machine uses encryption ? try switches down ! .   I have programmed a few of these mechs for the new pound and the only issue I have with them is the new pounds all go to the hopper with some machines on encrypted mechs.  The firmware will not force encryption on or anything like that the firmware is 1.49 form memory and the sr5des uses 1.59

I have some python code that can program sr5/sr5i mechs via cctalk and check firmware version etc if you are interested it would require building a simple interface but very easy just a diode and pull up resistor

The test was a complete success , the meter was tested and returned 0 on all readings.  Although it is possible to set the values to anything I feel it would be damaging if I released code that did that but may release an arduino sketch that zeros . I would be interested to hear of any hidden commands people may know of to clear a meter without hooking wires/clip on to the EEPROM