schematics Conrad Voltcraft M-3860M / METEX M3860PM digital

[Stefan]

Hi, does anyone have the schematics for a digital multimeter Conrad
Voltcraft M-3860M / METEX M3860PM ? There seems to be a problem with
its internal power supply and since the unit consists of 2 sandwich
boards, it is quite hard to find out the internal schematics by
looking at the PCB.

Thanks
Stefan