Longines VHP accuracy - Page 9
Like Tree1Likes

Thread: Longines VHP accuracy

Page 9 of 12 FirstFirst 1 2 3 4 5 6 7 8 9 10 11 12 LastLast
Results 81 to 90 of 119
  1. #81
    Member ppaulusz's Avatar
    Join Date
    Feb 2006
    Location
    Budapest, Hungary
    Posts
    2,506

    Re: Longines VHP accuracy

    It's a very long thread and one might got confused about the calibration procedures listed in this thread so here are the final (working) versions:

    6-steps instruction guide for calibration of the (non-perpetual) VHP:

    1. Open your watch.
    2. Pull the crown to position 3.
    3. For ETA 255.563: Connect a wire (or needle on the wire) to the '+' of the battery; tap the 'C-' or 'C+' terminal X times then wait 5 seconds then disconnect wire/needle.
    3. For ETA 255.561 and ETA 255.472: Tap (with a toothpick) the 'C-' or 'C+' terminal X times.
    4. Push the crown into position 1.
    5. Close the watch.
    6. Set the time as you would normally do.


    12-steps instruction guide for calibration of the VHP Perpetual Calendar:

    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.


    Please consider this thread closed and do not add new post to this thread so these final (working) calibration methods could easily be identified by the casual observers.
    If needed, further discussion about the calibration of the VHP movements can be continued in a new thread by linking this thread at the beginning of the new one.
    Last edited by ppaulusz; July 7th, 2008 at 22:18.
    jisham likes this.

  2. #82
    Member
    Join Date
    Dec 2008
    Posts
    2,431

    Re: Longines VHP accuracy

    I hate to post a new message here based on the above message, but rather than starting a new thread with my comments/questions on the regulating proces, I think it's best to post here to keep the "history" and ppaulusz definitive steps can hopefully be added by a moderator to the first message with a title in red for easy reference

    So here's a summary of my VHP tuning "odyssey" :

    1. Got a Flagship VHP in early February

    2. After an unexplained 10 second loss "hiccup", it was showing a +45/50 spy rate, way out of spec

    3. Snap on back so a massive pain to remove, a watchmaker put me out of my misery (used a box cutter and tapped on it with a small hammer !) and opened it

    4. Thanks to the service manual available here http://tinyurl.com/etavhpservice (type : 252.611 in "Option 2" and First link), the pics and steps here I knew what to expect

    5. Set up problems :
    a. Finding a way to power the watch, pull out the crown and tap on the C+ or C- terminal !
    b. I used a "scary" contraption made up of a multi-plug power adapter and the needles of my voltmeter! The voltemeter is handy to check that all is being powered as should be, especially the "needle" to tap the C+/C- terminals, here is a picture :



    6. Problems with the process :
    a. Pushing in the crown to 0 to wake up the watch is easy, pulling out to position 3 not so much, make sure you hear two clicks
    b. Another problem with the crown is pushing back to 1 without going to zero since you have to wait 5 seconds in 1 (bolded in the service manual)
    c. The remaining problem I haven't figured out is the tapping part. I read the messages above about that but the area to tap wasn't specified. I assume tapping anywhere on the gold connector is good enough? The service manual seems to point to the "black dot" inside the connector...

    7. Results : No joy so far, based on some quick testing, I'm at +73spy now (yes I did tap on the C- terminal)...duh! Well I did have to change the original battery as I was getting the EOL (+4 second jumps) signal so maybe I need to figure out the rate with the new battery and adjust it. Not to convinced though...If someone can clarify whether it matters where you tap on the terminals ? Thanks !
    Last edited by webvan; March 18th, 2010 at 23:32.

  3. #83
    Member
    Join Date
    Feb 2008
    Posts
    181

    Re: Longines VHP accuracy

    same here, already tried 3-4 times with no success, mine is +7,7 s/mo
    it's a pain so I am not so willing to try again
    the only AD Longines service here refused to play with it, and I will take it to another guy, I hope he knows about adjusting and has the tools
    my 8F32 Seiko is -25,5 s/y for 43 days on my wrist

  4. #84
    Member
    Join Date
    Dec 2008
    Posts
    2,431

    Re: Longines VHP accuracy

    Didn't your AD even offer to have it sent back to your local service center ? The watchmaker I was at the other day knew about VHPs but he said they couldn't be adjusted and that he was glad they had been phased out

    Do you have any sense as to what steps are causing you difficulties ? Which model do you have ?

    I did the process again, this time double-checking everything and tapping a bit longer on the C- and trying to aim at the "black spot"...we shall see.

    After starting the watch again, setting it and getting the delay with the "video method" I set it aside and when I picked it up 5 minutes ago I noticed it was doing its EOL (4 second jumps) again...with a battery I put in last night. That CR-2016 battery was still sealed but I've had it for years (about 10) so maybe it's "worn out" too...that or my watch has an issue. Can the EOL signal mean anything else (some type of shorting?) ? If it happens again I'll go out and get a brand new battery to rule out a battery problem.
    Last edited by webvan; March 13th, 2010 at 15:24.

  5. #85
    Member vizi's Avatar
    Join Date
    Oct 2007
    Location
    Budapest,Hungary
    Posts
    121

    Re: Longines VHP accuracy

    Assistant tool for calibration.....I made this, not pretty, but usable!
    Attached Images Attached Images





    Last edited by vizi; March 13th, 2010 at 20:25.

  6. #86
    Member dwjquest's Avatar
    Join Date
    Jul 2006
    Location
    Oklahoma, USA
    Posts
    638

    Re: Longines VHP accuracy

    I just tap on the gold portion. You may have to lengthen you tap duration to get a clear signal to the electronics???? Maybe George can clarify this point.

  7. #87
    Member
    Join Date
    Dec 2008
    Posts
    2,431

    Re: Longines VHP accuracy

    Thanks, yes I did tap a bit longer during my last try, I'll see what happens, but looking at the posts on the previous pages, it seems Hans had come to the conclusion that a "quick tap" is what the watch wanted.

    @vizi - nice setup !

  8. #88
    Member
    Join Date
    Jan 2009
    Posts
    3,103

    Re: Longines VHP accuracy

    Quote Originally Posted by vizi View Post
    Assistant tool for calibration.....I made this, not pretty, but usable!
    Looks like a smart setup - I would guess a 20mm shirt button with 2 holes for the wires and one 'cut' for access to the calibration part ...

  9. #89
    Member
    Join Date
    Feb 2008
    Posts
    181

    Re: Longines VHP accuracy

    Quote Originally Posted by vizi View Post
    Assistant tool for calibration.....I made this, not pretty, but usable!
    contact points are not where the wires in the button are, if we look at the picture in the manual
    how do you know where to fix them

  10. #90
    Member Hans Moleman's Avatar
    Join Date
    Sep 2007
    Location
    New Zealand
    Posts
    1,450

    Re: Longines VHP accuracy

    Very clever!
    Now why didn't I think of that?
    Simple ways to solve a complex problem. I like it!

    Tapping on the golden conductive part is the way to register impulses.
    A quick tap is enough.
    A scrape could register a few impulses.

    The lack of feedback is the main problem here:
    No clicks, no beeps, no movement.
    The effect of on impulse is only seen a few weeks later.

    That's why I had to make my own timing machine. So that I could quickly see what I had done.

    I easily made more than a dozen attempts to get anywhere near the perfect setting. Then I made a dozen more for no good reason, simply because I did not account for temperature effects.

    The watch can stand it. It won't break because of it.

    On the other hand: Try to get a perfect result with a condenser screw.
    They are way more finicky.

Page 9 of 12 FirstFirst 1 2 3 4 5 6 7 8 9 10 11 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts
    •