⟐ Commented 三月 15, 2026 at 13:08 GMT-7

The camera was fully disassembled and reassembled. I cleaned the shutter blades only I did not disassemble the electromagnet/timer assembly.

Current symptoms:

• Mechanical M and 125X modes work perfectly.
• Bulb (B) works normally.
• The light meter is working correctly and the LED display changes as expected with different lighting.
• In AUTO mode the shutter occasionally remains open indefinitely. The problem is completely random and can happen at any shutter speed.
• While the shutter is stuck open, the selected shutter speed LED in the viewfinder remains illuminated.
• Switching the mode dial to 125X or M immediately closes the shutter.
• Removing the batteries also immediately closes the shutter.
• The advance lever remains locked while the shutter is stuck.
• The self-timer behaves exactly the same as pressing the shutter release directly.
• Tapping the camera body does not release the shutter.

From the service manual, it seems the electromagnet continues to be energized instead of being released. I'm trying to determine whether this is more likely caused by the timing/memory switch circuitry (SWT/SWM), a mechanical timing contact adjustment, or a fault on the PCB (transistor, capacitor, etc.).

Has anyone experienced this exact symptom after a CLA, or knows which contacts or adjustments should be checked next?

⟐ Commented 八月 07, 2026 at 6:09 GMT-7