SONY BVH-3000/3100 Rotating drum engine hall sensor mount
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SONY BVH-3000/3100 Rotating drum engine hall sensor mount for FG-05 PCB
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I recently acquired a large Sony BVH-3100PS VTR and discovered a known mechanical issue with the rotating drum assembly. The original Hall sensor mount is made from zinc alloy, which is susceptible to zinc pest. As the material deteriorates and deforms, the mount can allow the Hall sensor assembly to interfere with the drum’s magnetic wheel, potentially causing the motor to seize or resulting in further mechanical damage.
To address this issue, I designed and fabricated a replacement mount.
Important installation notes:
Grounding: Since the replacement mount is made of plastic, ensure that both shields and the PCB are properly grounded to the drum body. Pay particular attention to ground loops; use a star-grounding configuration.
FG-05 modification: It may be necessary to desolder all components and connections from the FG-05 assembly and flatten it before reinstallation (ive used hot table for SMD soldering). Refer to my photos for details. Once the assembly has been flattened, resolder everything in its original position.
Hall adjustments - put hall on its place before soldering it back - align it be in ~0.4-0.3mm from magnet ring and after installing of bar - install and solder pcb contacts.
Let's preserve broadcast television history and keep these machines running for years to come!