Breitling aerospace cal 79 calibration, why it fails ?

[Hans Moleman]

P.S. The interesting thing following the 1666 movement (X-33) calibration procedure is that a deviation in the (-) range requires a C-
pulses against the battery + and viceversa for (+) deviation.

I am puzzled about that remark.
Don't you do the same for your E20.341?

[TicTacman]

I am puzzled about that remark.
Don't you do the same for your E20.341?

Thats exactly what puzzles me Hans.
In procedure 1666 when you have a (-) negative deviation value you involve the C- for correction
when its positive deviation value (+) you involve C+ for correction. exactly opposite to E20.341 procedure. ( both ETA movements )
thats visible comparing both calibration documents.

[Hans Moleman]

Thats exactly what puzzles me Hans.
In procedure 1666 when you have a (-) negative deviation value you involve the C- for correction
when its positive deviation value (+) you involve C+ for correction. exactly opposite to E20.341 procedure. ( both ETA movements )
thats visible comparing both calibration documents.

I see. Some akward wording there.
Ultimately though: C+ speeds the watch up. C- slows it down.

Don't give up. It took me dozens of attemps before I got it right.
I made all the mistakes in the book though.

[ronalddheld]

I look forward to reading about the successful technique for the Breitling.

[PeterG_SVK]

I checked ETA documents for the E20.341 calibration - it looks like the calibration terminals are small and deep in the movement body, are they? Recently I calibrated ETA 251.232 and needed to make very thin isolated tip (max. 1.1mm diameter incl. insulation) on the wire to reach the C terminals. As I've mentioned elsewhere, first I touched the tip to the correct C terminal steadily (the tip fit hardly into the hole, so deep the terminal is), then tapped on the + battery with the other end. It looks like I was successful, but time will tel, how well .

[TicTacman]

I checked ETA documents for the E20.341 calibration - it looks like the calibration terminals are small and deep in the movement body, are they? Recently I calibrated ETA 251.232 and needed to make very thin isolated tip (max. 1.1mm diameter incl. insulation) on the wire to reach the C terminals. As I've mentioned elsewhere, first I touched the tip to the correct C terminal steadily (the tip fit hardly into the hole, so deep the terminal is), then tapped on the + battery with the other end. It looks like I was successful, but time will tel, how well .

well, i performed the same procedure and took care to be steady on the C+ witha correct tool.
after the last calibration in which a took a extreme corrective attitude of C+12 pulses, let me tell you that I start to see a trend
but let me keep it tight to my chest till next month to have a final hahaaaa !
will keep you posted.

[chris01]

Have you had any success? I have been trying the same procedure with nothing to show for it after four attempts. I am a bit dubious about the use of the E20.341 documentation for several reasons:

1. My B79 is marked "E10.541" with no mention of E20.341.
2. The ETA documentation for E20.341 shows a very different movement from the B79. There is nothing online for E10.541.
3. I can't get the E20.541 procedure to do anything:
- Set the two digital displays off (the 'neutral' position)
- Pull out the crown (the upper display shows "R")
- Apply + pulses to the "C+" terminal (I assume the "C" terminal implies "C-")
- Push the crown back in to the normal position

I tried asking for help on another, more specialised, forum. All I received was a smart-arse, patronising put-down from a Mod, who thought I had no right to know anything about the internals of MY watch.

[HuKu]

Hi,
I had the same problem to regulate my Breitling B1. After several successless trials following the instructions I've taken a copper wire as thick as possible and as short as possible to put deep in the outer hole and gave three short pulses to the + pole of the battery. The result was (as wanted) slowing down the watch for 12 seconds per year, deviation now +- 0 seconds per year. The important thing seems to me to take a short and thick wire resulting in a very low electrical resistence.
HuKu

[chris01]

Congratulations on a result! Unfortunately the B79 movement is quite different. I have plenty of experience in regulating other ETA TC movements that have a similar layout - flat pads on the surface of the PCB - but I think the problem is in how to set up the watch before and/or after applying the pulses. It seems that nobody knows how, or at least they're not telling.

[Eeeb]

Congratulations on a result! Unfortunately the B79 movement is quite different. I have plenty of experience in regulating other ETA TC movements that have a similar layout - flat pads on the surface of the PCB - but I think the problem is in how to set up the watch before and/or after applying the pulses. It seems that nobody knows how, or at least they're not telling.

eta.ch / service portal / technical documents