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Omega 1620 movement running slow

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rogart

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Omega 1620 movement running slow

Post04 Mar 2016, 23:04

I have noticed that i ain't keeping the time over some weeks like the other 1620 i got? In which direction should i turn the trimmer? i don't wan't to make it go even more wrong? About 15 minutes a month a think it is now?
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767Geoff

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Re: Omega 1620 movement running slow

Post05 Mar 2016, 07:10

Okay, hard to tell, move it through 180 degrees and it goes the other way.

Don't know where yours is sitting, in that 180 degrees so trial and error or a quartz timing machine. Long way is to move it clockwise 45 degrees (1/4 turn) note over a week if it got slower or faster and REMEMBER which way you turned it. If it goes slower, then a quarter turn back and another quarter turn back. Time again. If too fast on the first attempt back off 1/8 (22.5 degrees).

Clear as mud?

:bang: :grin1:
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rogart

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Re: Omega 1620 movement running slow

Post05 Mar 2016, 14:01

Thanks . Have turned it about a quarter of a turn clockwise. Have an other speedmaster 1620 that is running good sitting next to it. Will check over the next days how it runs .
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Caruso

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Re: Omega 1620 movement running slow

Post06 Apr 2016, 20:56

I've got the same problem with my cal 1620 - losing about 2 sec's per hour or a min per day.

Today I tried adjusting it with seemingly no effect.

08:57 minus 2 sec
09:45 minus 4 sec
10:53 minus 6 sec
12:56 minus 10 sec - adjusted clockwise 30 deg
13:27 minus 11 sec
13:56 minus 12 sec - adjusted clockwise further 30 deg
15:11 minus 14 sec - adjusted anticlockwise 120 deg
16:10 minus 16 sec - adjusted anticlockwise 45 deg
16:11 minus 20 sec - sudden jump caused by the adjustment?
17:11 minus 22 sec - adjusted anticlockwise 90 deg
20:00 minus 28 sec

Does anyone have any ideas?
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dutchsiberia

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Re: Omega 1620 movement running slow

Post06 Apr 2016, 21:08

Maybe try smaller turns of the screw?
Or the crystal has deteriorated so much that adjustment isn't possible anymore? I've got some watches that can't be regulated anymore, I've got a quartz watch timer, some watches stay at for instance -2 seconds whatever I try.
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Caruso

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Re: Omega 1620 movement running slow

Post06 Apr 2016, 22:32

I thought that quartz watches get faster as the crystals age - nearly all of my vintage quartz watches run fast to some degree.

Maybe it's a failing peculiar to the cal 1620? Perhaps the trimming circuit fails making it run slow?

dutchsiberia wrote:Maybe try smaller turns of the screw?
Or the crystal has deteriorated so much that adjustment isn't possible anymore? I've got some watches that can't be regulated anymore, I've got a quartz watch timer, some watches stay at for instance -2 seconds whatever I try.
Check out my vintage digital channel on YouTube:
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charger105

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Re: Omega 1620 movement running slow

Post07 Apr 2016, 11:17

Caruso wrote:I've got the same problem with my cal 1620 - losing about 2 sec's per hour or a min per day.

Today I tried adjusting it with seemingly no effect.

Does anyone have any ideas?


The trimmer cap is only intended for fine tuning of the oscillator circuit. 1 perhaps 2 seconds per day adjustment.
If it's running slow at 60s per day then the trimmer will only swing the frequency offset roughly between 62s and 58s per day......you won't really notice any improvement.

The oscillator circuit is made up of several components (quartz crystal, capacitors, resistors). Any of these may have degraded causing it to run off frequency.
Rgds.
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Caruso

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Re: Omega 1620 movement running slow

Post08 Apr 2016, 21:36

Thanks for your replies folks.

I took Dutchsiberia's advice and have been making finer adjustments. However, even after more than 25 adjustments and measuring timing in between I've come to the conclusion that charger105 is spot on the money and that the movement is 'out of adjustment'.

I did detect slight variations, but nowhere near enough to get the timing into spec.

Does anyone know if 1620 movements are still available from Omega? Otherwise it's off to Ebay for a scrappy watch with a good movement.
Check out my vintage digital channel on YouTube:
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rogart

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Re: Omega 1620 movement running slow

Post28 Apr 2016, 23:01

Caruso wrote:Thanks for your replies folks.

I took Dutchsiberia's advice and have been making finer adjustments. However, even after more than 25 adjustments and measuring timing in between I've come to the conclusion that charger105 is spot on the money and that the movement is 'out of adjustment'.

I did detect slight variations, but nowhere near enough to get the timing into spec.

Does anyone know if 1620 movements are still available from Omega? Otherwise it's off to Ebay for a scrappy watch with a good movement.

Sometimes see 1620 movements for sale on Ebay. But they are very rare? Haven't got my movement to run any better. Still losing time.

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