Mamiya RB67 Power Drive film back problem

[Geoffrey Swan]

Seeking help again please - newby with RB67. Tried two different winder backs.. after taking just two shots the film winder wound all the way to the end. Not sure what LT, T/M.UP mean on top... but mine is set to the left - off I presume. Maybe I should be in LT?

 

[Geoffrey Swan]

Given the film is wasted I decided to open and (expose) and wind it back onto the spool. I did this three times and I could NOT duplicate the error... it just moved forward frame at a time. I tried the LT and off option and no apparent difference. Really confused and now nervous about using power back versus manual winder.

 

[MattKing]

Mike Butkus has the manual for it: http://www.cameramanuals.org/mamiya_pdf/mamiya_rb_67_motor_drive_roll_film.pdf
I'd recommend sending him his requested donation.
In case you haven't already discovered it, here is his index for Mamiya lenses and accessories: http://www.butkus.org/chinon/mamiya/mamiya_lenses_accessories/mamiya_lenses_accessories.htm

 

[shutterfinger]

Given the film is wasted I decided to open and (expose) and wind it back onto the spool.

Only if the shutter was open and the darkslide removed. In the event it happens again remove the film and take it into a dark room or change bag along with an empty spool and rewind the film onto the empty spool.
Keep the film tight on both spool and keep the spools together. When you get to the film end it will be loose, unroll just enough to start the film on the take up. Skip the exposed frames at the first of the roll on reloading the camera and continue exposing the roll.

It may be that your back needs a CLA resulting in a lever or pin sticking causing the wind malfunction.

 

[Geoffrey Swan]

Thanks Matt - good to hear from you again. Yes - already have the guides but nothing about my problem.. though I did note the info on LT and TM Up which I missed first time round.

 

[Geoffrey Swan]

It may be that your back needs a CLA resulting in a lever or pin sticking causing the wind malfunction

I am sure CLA means something like a "clean" or "service".. can you please explain..thanks

 

[Geoffrey Swan]

Only if the shutter was open and the darkslide removed. In the event it happens again remove the film and take it into a dark room or change bag along with an empty spool and rewind the film onto the empty spool.
Keep the film tight on both spool and keep the spools together. When you get to the film end it will be loose, unroll just enough to start the film on the take up. Skip the exposed frames at the first of the roll on reloading the camera and continue exposing the roll.

And again.. no darkoom as yet.. so limited to changing bag.. had a go... but I need much more practice.. really challenging to re roll a 120

 

[shutterfinger]

I am sure CLA means something like a "clean" or "service".. can you please explain..thanks

Clean, Lube,Adjust aka basic servicing to ensure proper operation, applies to all camera equipment.

And again.. no darkoom as yet.. so limited to changing bag.. had a go... but I need much more practice.. really challenging to re roll a 120

https://www.bhphotovideo.com/c/product/41880-REG/Photoflex_AC_CROO1_Film_Changing_Room_25.html
One of if not the best. Now that you have a wasted roll practice in daylight with your eyes closed until you get it right consistently then do it in the dark.