HD7840
2-7
REPAIR INSTRUCTION
Adjusting the Coffee Volume output.
When for some reason the pump or PCB had to be replaced,
please be aware for the following adjustments to perform.
At the factory all appliances are 100% adjusted to get the
right volume output.
If one of the components (PCB or PUMP) has been
exchanged, the appliance has to be adjusted again before
returned to the end user.
Necessary process steps to adjust the volume:
1. To get access to the
potentiometer that makes
it possible to adjust the
volume output, remove with
a pair of tweezers the plastic
lip under the base.
(See picture 2 for location)
2. Be sure the boiler is filled properly, other wise perform fill
procedure see DFU for instructions.
3. Switch appliance on and wait until the unit is ready to
brew.
4. Be sure a
podholder
is placed, but
without
a Coffee POD.
(only adjusting with
plain
water)
5. Place a cup on the drip tray cover and push the one-cup
button.
6. Now the unit is stabilized.
7. Empty the cup and push again for one cup setting,
measure the volume output with a graduated beaker.
In the table you can find the requirements for the
minimum/maximum volume output cc/mL values
depending from the country version:
One cup setting, Including Podholder,
water spec.
(without Coffee pod)
Min. water
cc/mL
Max. water
cc/mL
France version
104
120
General version
127
143
* Each time the potentiometer has been adjusted, make
twice a one cup setting and measure the volume of the
last setting, this to stabilize the unit.
8. With a small screwdriver the potentiometer can be
adjusted (if you look at the front of the appliance, lower
volume adjust screwdriver counter clockwise, higher
volume adjust screwdriver clockwise)
9. Repeat step 7 to 8 until the measured volume is between
the allowed minimum/maximum tolerances stated in the
table.
10. End.
DISASSEMBLY- AND RE-ASSEMBLY ADVISE
Disassembly information
To remove the back cover (item 12 exploded view) handle as
follows:
- Remove valve outlet.
- Unscrew the 4 Torx screws.
Now remove gently the back cover.
- Reassemble follow steps backwards.
Removing 3-way valve (item 19 exploded view) handle as
follows:
- Remove back cover.
- Unsnap boiler out of brew chamber.
- Rotate the 3-way valve a quarter (90°) counter clockwise.
- Gently pull the 3-way valve out of the boiler.
- Reassemble follow the above steps backwards.
Removing Brew chamber head (item 1 exploded view) handle
as follows:
- Remove back cover.
- Place the appliance such a way that you are looking at the
boiler.
- First remove the boiler from the snap lock position of the
brew chamber. To do so use a screwdriver and bend slightly
the both ribs to the outer side and pull the boiler out of the
fixation point.
- Now remove 3-way valve.
To remove the brew chamber
unlock snap lock at the front
of the brew chamber.
Use your both thumbs
(see picture 1) and push
strongly upwards with a little
distortion (rotation) until the
brew chamber comes loose.
- Reassemble follow above steps backwards.
To reach the components like PCB and Pump placed on the
base handle as follows:
- First remove back cover, brew chamber and 3-way valve.
- Remove the 4 Torx T15 screws (
A
) (see exploded view)
- Remove the metal housing (Item 13 in combination with
plastic housing part) by pulling gently upwards.
- Unsnap at the base side the 4 snap locks with a screwdriver
and the metal housing (Item 14 in combination with plastic
housing part) can be removed from the base.
The necessary parts can now be reached.
IMPORTANT NOTE!
When the
PCB
or
Pump
has to be replaced, please follow
careful the instruction -
adjusting the Coffee volume output
,
see chapter
REPAIR INSTRUCTION
- To reassemble follow above steps backwards.
picture 1
picture 2
= changed
