Urgent Help Needed with Mamiya 645AFD

[aerlex]

I just borrowed my friend's Mamiya 645AFD and was toying with it when the mirror suddenly went up in a mirror locked position and doesn't come down anymore.
Tried pulling the mirror down with my hand, removed and replaced the lens and film back, turning the mirror up button, and everything else but nothing seemed to work.
Anyone encountered this before?
How can i solve this beside sending back to the workshop?
and if i have to send it back, where to send to?
any advice is appreciated now.
thanks all...

 

[sprewell]

Try putting batteries in.

When the batt goes flat the mirroe will flip up.

 

[aerlex]

Try putting batteries in.

When the batt goes flat the mirroe will flip up.

already placed a new set of batteries
doesn't work