Looking for service manual Bronica GS film magazine

Anyone has worked on Bronica GS1 film magazines?

Have one that has rather small problem, it appears. The wind-on knob is disengaged and will not advance film (free spins). With back mounted on camera, gear works fine. Just need to open it up and see what makes the knob connected to the gear section. But I suppose there is a proper sequence of taking screws out ?

I am not near my camera at the moment but here are some thoughts:

- some times problems with wind are related to the pins that signal the wind/cocking state between the body and back. I think I have a back with the opposite problem, the wind knob on the back locks up and won't turn until you wiggle one of the little interlock pins. So that may not be your problem.

- I believe the wind knob on top is on a shaft that runs down to the bottom and the engagement with the wind mechanism is down there, so you want to take the bottom cover off, which IIRC is fairly straightforward.

- Here's a video of the internals (not mine):
- I think there is someone on US ebay who sells photocopies of the GS-1 repair manual, which I intend to buy someday, although other than the sticky interlock and one back that is stuck, I haven't had a problem with it.

@reddesert this is great, thanks

Hassasin said:

Anyone has worked on Bronica GS1 film magazines?

Have one that has rather small problem, it appears. The wind-on knob is disengaged and will not advance film (free spins). With back mounted on camera, gear works fine. Just need to open it up and see what makes the knob connected to the gear section. But I suppose there is a proper sequence of taking screws out ?

Click to expand...

The service manual is available at https://www.ebay.ca/itm/314999886321. About $35 shipped to US addresses. I haven't checked it to know how well magazines are covered, but the table of contents has a section called "Film Back GS-1".

tom williams said:

The service manual is available at https://www.ebay.ca/itm/314999886321. About $35 shipped to US addresses. I haven't checked it to know how well magazines are covered, but the table of contents has a section called "Film Back GS-1".

Click to expand...

Appreciated, have found it too and will likely order as I have one dead body anyways, maybe that will help too.