Check:
1. Remove the focusing unit (there are many tutorials online).
2. Check whether the focusing teeth are safe.
3. Check whether the gear of the motor is safe.
4. Measure the infinite resistance of the focusing motor. (real reason)
This motor is so small that it is estimated that it is difficult to buy a suitable one. Take it apart to measure the brush contact piece. Detection resistance
Careful observation shows that there is oil on the brush contact piece and the small brush on the motor shaft, and the distance between the two brushes is slightly larger. Resulting in poor contact.
Handling:
Alcohol (industrial alcohol) cleaning brush contact piece, small brush. Be careful not to smear alcohol on the motor winding when cleaning, otherwise it will be broken, and there is no solution!
After assembling the motor, drop two drops of engine oil into the motor speed changer, which uses plastic gear grease.
Measure the motor resistance at all angles of the rotating shaft, apply 1.5V DC voltage to test, and the current is 40mA, and the forward and reverse actions are OK.
Reassemble G 1 and start the focusing action with the remote controller to return to normal.
Gently adjust the shapes of the two brushes to the middle with tweezers.
Summary:
The planning and workmanship of 1 and G 1 are still excellent and worthy of recognition.
2. The focusing problem should be the failure of the focusing unit, and it is unlikely that there is a problem with the dimming circuit.
3. It is best not to hold one direction for a long time when using the focus function. It is more scientific to use a little movement. Because the focusing unit is mechanical. The teeth of the motor drive unit are particularly fragile, and the machine is easy to be damaged when it reaches the limit position. This should also be an ill-considered place in the plan.
4, anyway, over-insurance, bold toss. The big deal is that the focusing unit can't be repaired. Connect a small lever and adjust it manually, gnome male-~
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