The analogue clock in my van’s been irritating me for a few
years by randomly running fast and slow and generally being useless. Turns out it’s pretty easy and costs less
than a quid to fix!
I had a brainwave and searched Google for “vanagon clock fix”
and found this site - http://www.pauldottrip.com/84vanagon/analogclock/analogclock.html" rel="nofollow - http://www.pauldottrip.com/84vanagon/analogclock/analogclock.html
Good information, but a little light on instructions, so I decided
to write up how I did it. Basically you need to replace 2 capacitors and you
should be good to go. If your clock is
still ticking, but not keeping good time, this seems to be the cause of the
problem. I’m no electronics genius, but it’s fairly straightforward. I reckon you’d be fine if you done a CDT GCSE
or similar.
You will need various screwdrivers and sockets to take the
instrument cluster apart, plus a soldering iron, some solder, some wire cutters
and a glass to rest the clock on whilst you work on it. You also need to purchase 2 capacitors from Maplins
or similar. They need to be 100μF and be
suitable for over 12V. I used 2 100μF 35V Radial Electrolytic Capacitors (Maplin part
number VH38R). These cost all of 29p each.
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First remove the instrument cluster from your van. It’s quite obvious how to do this. Undo the 2 screws on either side, pull off
the large connector plug on the right hand side (behind the clock), unplug the speedo
cable and pull out the switches. Bring
it indoors.
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Now remove the clock.
To do this you need to move the circuit film. Pull off the white clip circled in orange in the
photo. Be careful here as it holds a bit
of the circuit film onto the clock contact and it is quite easy to tear the film.
Undo the 5 nuts holding the film onto
the back of the clock (2 above and 2 below the clock). Undo the 6 screws circled in the photo, 1 at
each corner, 1 on top of the clock and one on the transistor on the right hand
side. This will allow you to lift the
clock slightly off the cluster and unclip the big black connector on the left
hand side. There is a clip at the top
and the bottom. These are quite
stiff. Rest the clock back on the cluster
and put the black connector clock to one side.
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The circuit film is held on the clock by a number of “spikes”
as shown in the following photo. You
need to prise the film off these very carefully. I used a small screwdriver to do this. The film can now be lifted away from the
clock and the clock removed. Put it face down on top of the glass so you do not
damage the hands.
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Next step is to remove the temperature and petrol gauges. These are simply clipped in place. Just squeeze the clips to remove them. Set them
down carefully as the needles are delicate.
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You will be left with the clock mechanism in its case. With it face down on top of the glass, you
will see that it is held in by 3 small screws at the back of the case and 3
around the front. It is also held by a
solder connection marked “unsolder” in the first picture. Unsolder this before undoing the screws. You can get unsoldering tools that suck the solder
away, but I’m too tight to buy one of these.
I did it by prising up the copper connector whilst I heated up the solder. Once the solder is molten, the copper contact
will just lift off. Undo the 3 screws
front and back and you should be able to lift the plastic casing off.
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Turn the mechanism around until the 2 gold cylinders
underneath the board are facing you. These
are the capacitors that you need to replace.
Pull off the foam backing on the circuit board. You need to unsolder the two capacitors. You will see their “legs” sticking up through
the board as circled in the photo. Either
use your unsoldering tool or prise them off whilst you heat the solder.
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Clear out the holes in the board. Take your new capacitors and poke them
through the holes. Note that one leg is
longer than the other. The long leg is
the +ve side and needs to go through the hole marked +ve. On mine these were on the left as you looked
at the board. Solder them in and snip
off the excess.
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Reassembly is the reverse of the disassembly. Put the foam
back in place, put the plastic case back
on the back and screw it in place.
Resolder the contact on. Clip the fuel and temperature gauges. I gave the needles a clean at this stage –
big difference! Put the circuit film
back on and replace all the screws and nuts. The big black connector block can
now be clipped back on. You need to be very careful when you put the white
connector back at the rear of the clock.
It is easy to crease the circuit board.
Put the instruments back in the van, reconnect switches, speedo etc. and
enjoy perfect timekeeping.
Hopefully this will be useful to some of you!
Ben
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