seem to struggle thing the new battery to Seiko perpetual calendar watches

and also resetting them. So today

I'm going to show you how to do that. A perpetual calendar watch

should remember that date even if there's only 28 days

or thirty days in a month and

it stores this in its internal memory.

This memory can sometimes get wiped out when the battery gets changed.

And so you will have to reset this manually.

The unfortunate thing about this watch is that it's very easy to break when

changing the battery

a) the battery is hard to remove if not done correctly.

b) there is a paper thin circuit board

and if you lever against this

you can actually puncture holes through it and damage the circuit board

unfortunately the circuit boards are extremely expensive because they're now

not being made anymore.

You'll see that there is

silver coloured

metal parts around the edge of the battery.

and this is where you want to lift the battery from...

not from the yellow parts. The yellow parts.

are actually part of the circuit board and

those will puncture if you try to lift against them.

Use a fairly wide flat screwdriver...

carefully put it underneath the battery

and twist.... don't push

just twist until the battery lifts up

if you push you could slip under the battery and damage the coil.

The coil is the orange part...

it's around 50 meters of copper wire...

it's very fine and will break...

very easily and so you have to be very careful

So we've removed the battery. Now the new battery

The reverse of removal..

Slide the battery under

the two little flaps on the right hand side...

if the winder is pointing towards you. You'll see this this little

retaining spring... just pull it out very carefully

and snap down the battery.

Now you can start resetting the calendar.

When you first fit the battery...

the watch will not actually be working. Don't be alarmed by this

the second hand will not start working until you've cleared the circuit board

and to clear the circuit board you have to short out the

AC contact which i'm pointing to here...

and the positive side

of the battery.

just like this. So just lightly touch them together

and hold for a few seconds. This will make the watch start working

It will be jumping one second at a time. Now you need to pull the winder fully out...

and push it back in. Now it's jumping four seconds at...

a time. This means that

the memory has been cleared and therefore we need to reset the perpetual

calendar

if it continues to jump one second at the time

that means it's remembered

the calendar information and you don't necessarily have to go through the process

of reseting the calendar memory

however I always do anyway

just be a hundred percent sure

to start with...

we need to zero the calendar ring. That is...

to move the calendar ring to

the first of the month or so that the calendar displays '1'

To do this, find the contact

with '0' printed

next to it...

it's to the right the winder if...

the winder is pointing towards you and you

short the yellow contact with the positive side of the battery

and you keep doing it each step

until the calendar ring moves around

to the figure '1'

So if we look now...

'1' is showing. Now we are ready to set the year.

To set the year look for the

'Y' contact which is here so it's just a left of the winder

if the winder is pointing towards you.

You short it again

until you get to the correct year. If it is one year away from the leap

year

then you set it to '1' If you two years away set it to '2'

if you're three years away then set '3' if you are actually

on a leap year then set it to '4'. For example....

2012 was

a leap year so that would have been '4'

this year it is 2013

and so we set it to '1' because this one year

after the leap year. Next is to month

and you press it once

to get it into month setting mode. Then you keep pressing

until you get it to the correct month

showing in the calendar

have a quick look

This month its

September so we need it on '9'

So finally we need to set the day

Find the 'D' contact

which is here

to the right of the winder if the winder is pointing towards you

and short once

to get into day changing mode and

if you listen carefully and you're in a quite room you can actually hear the

calendar turning over

and it will first go to '1'

and then you keep shorting until you get to the correct day...

today is the 18th so I am shorting 17 times

because it starts off a number one and hopefully if I

have done it correctly it will show '18' on the calendar

So now we've set

calendar and we've set the leap year

we've set the month... push to winder in

pull it out.... and push the winder in again

And we're done. When i say pull the winder out

I mean pull it all the way out... Don't pull it midway out

There are 3 positions... - All the way in

- Mid way out - And fully out

[Recap] We have fitted the battery...

And reset the calendar. All that's left now is to

reseal the watch and to perform a pressure test

it is an easy watch to break... so be very very careful when fitting the battery

remember that the circuit board is literally

paper thin