Hans, I just had a chat with my Brother who knows a great deal more about electronics than me. He helped me with the calibration or rather I helped him as he is the handyman in the family. The bottom line is: in his opinion, you are right, that extra step is needed!!! He even added that he should have known better and should have realised the importance of the 0 position of the crown straight away.Hans, your theory about step 3B makes sense. It might be the missing link. Yes, it can happen that the watch has an "on switch" (crown position 0) for safety reason and for avoiding draining of the battery in the shop (as you mentioned)...
Take it as a compliment, Hans!:-!
So the 11-steps guide becomes the 12-steps guide:
1. Remove the battery (leave the crown at position 1 - neutral).
2. Connect needles to the '+' and '-' terminals. (See in diagram on page 19.)
3. Connect the 3V external power supply to the wires that are soldered to these needles.
4. Push the crown to position 0 then release it back to position 1 - that action is needed to switch the watch on - then wait for the date ring to complete its turn.
5. Pull the crown to position 3.
6. With one more needle connected to the '+' of the external power supply; tap the 'C-' or 'C+'terminal X times. (The direction and the number of pulses depend on the current rate of the watch. See the manual for more info.)
7. Push the crown into position 1.
8. Wait 5 seconds.
9. Disconnect power (remove the needles).
10. Insert the battery and close the watch.
11. Push the crown to position 0 to switch the watch on. (The seconds-hand will start to run.)
12. Set time as you would normally do.
Well, looks like our group effort finally got this thing right.
I look forward to your result, Hans, using the latest formula.
Our friend, David, might want to use the latest guide too for his attempt to calibrate his Longines. I'm sure he too will post his findings for this forum.