Mamiya 645afd err-02 What is it ?

[NNN634779463250567558]

Hello Dears ! From a couple of days I recently observe the problem with my mamiya at the beggining it was problem with shutter - sometimes firing , sumetimes not. I am using it with the film back and 120 films. From a few days the camera do not answear the only communicate as the response for pressing the shutter is err-02 I would like to know what is it ? It did not fall down and I think technicaly is ok. What is interesting when I detached the lens it and press the shutter , the film is transporting in the back , shutter is firing and everything seems to be good, when i connect the lens the lens works ok - perfect AF as in the mamiya and after when I press the shutter err-02 Do somebody have any idea what can cause this problem ?

Thank you in advance for your repplies
Oskar

[Drew]

Please consult the Manual.
The procedure for the presence of this error is to replace the batteries. If the error remains please consult your dealer for service.
There is no way to accurately diagnose the body without evaluating it first hand.

[NNN635461549592536341]

Hi everybody!
The same problem and the "Err-- 02" message on the main display.
Description: The body is 645 AFD, the lens is AF 55-110/4.5, back is Kodak Pro M.
First day of use AF 55-110 lens after 50-55 frames made then appeared an "Err-- 02" message. The lens is making such a special noise like a bee in a matchbox. Diaphragm doesn't stop down to the selected aperture while shutter works ok. Pressing the field of depth preview button makes the same effect: diaphragm doesn't stop down and the lens is making a noise. Replacing AF 55-110 to another lens (AF 80/2.8) solves the problem and everything works ok. Placing AF 55-110 back onto the camera returns the problem and ""Err-- 02" message.
Have anybody met with such an issue and what is the cure ?
Thanks in advance.