Szukam schematu multimetru Maxcom MX 620 - problem z pomiarem prądu

I am sorry to intrude like that, but after searching very hard the net with Google and others, it seems that only on your forum I might find the electronic scheme of the multimeter Maxcom MX 620. I have one and I have problems on the amperage measurement.
I would be very thanksfull to anyone who could send me that scheme. mail: costin.bad(_at_)gmail.com