Bronica Etrs repair & common faults
Excellent coverageThe Bronica ETRS is a mid-1970s Japanese medium format SLR shooting 645 frames through interchangeable backs, lenses and finders. It runs on aperture-priority auto exposure metered off a silicon photocell, with an electronically timed vertical shutter and no mechanical fallback speeds, so the body's condition and its power supply are tied together far more tightly than on a mechanical camera.
Aperture-priority auto exposure · electronically timed vertical shutter · silicon photocell metering · 6V battery, no mechanical backup speeds · interchangeable 645 backs, finders and lenses
Common Bronica Etrs faults
Bronica Etrs shutter won't fire
This body has no mechanical backup speeds, so a flat or corroded 6V cell will stop the shutter dead, worth swapping for a fresh one before anything else. If that doesn't wake it, the fault sits in the AE circuit between the lens contacts, the film back interlock or the release switch itself, and tracing it means opening the body.
Bronica Etrs back or dark slide stops the shutter firing
Interchangeable backs on this system carry their own interlock, and the body won't release unless a back is properly seated and its dark slide is in the correct position for shooting. Worth checking the slide and the back's lock before assuming a fault. If the interlock still won't clear with both correct, the contact pins or the switch behind them have failed.
Bronica Etrs shutter speeds are erratic or inconsistent
Speeds that drift between frames, or exposures that come back consistently lighter or darker than the dial suggests, point to age in the electronic timing circuit rather than damage. Components on the AE main circuit degrade gradually over decades of service, and it's a pattern this model is known for rather than a one-off failure. It rarely shows up until frames are compared side by side.
Bronica Etrs meter won't respond to light
A display that stays dark or pinned regardless of the light hitting the lens usually means the metering chain has failed rather than the shutter itself, the silicon photocell, its wiring, or the switch contacts feeding the AE circuit. Contact wear here is common with age. Worth confirming the meter is actually switched on with a light half-press of the release before assuming a circuit fault.
Bronica Etrs winding crank won't complete or release feels locked
A crank that won't finish its stroke, or a release button that feels dead under the finger, usually means the winding-to-shutter interlock hasn't fully cocked, a switch that's fallen out of adjustment rather than a broken gear train. Worth checking the crank has genuinely reached its stop, a half-wound crank leaves the body in a false-ready state, before assuming a jam.
Stuck on your Bronica Etrs?
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Try it now ›Scatto is a reference tool for people who service film cameras. It explains mechanisms and quotes service data, but it cannot see your camera at the bench, so verify anything load-bearing before you act on it.