Kenwood DeLonghi Cooking Chef KM070 Operating manual

SM0001
Issue 1
Models:
KM070
KM080
Cooking Chef
Technical Service Manual

1

Contents
2
1. Safety Information
2. Specifications
3. Features and Operation
a. Induction Cooking
b. Display
c. Temperature Measurement
d. The Bowl
e. Speed Control
f. Safety Interlocks
g. Gearbox
4. Disassembly Instructions
a. Head Assembly
b. Base and Induction Assembly
c. Pedestal Assembly
5. Troubleshooting
a. Error Codes
b. Diagnostic Mode
c. Speed Calibration
d. Temperature Calibration
e. Interlock Test Procedure
6. Circuit Diagrams
a. All Except US
b. US Only
7. Technical Information
a. Change to Body, Cover and Insert
b. A957/A – Ice Cream Maker Attachment
c. Ankarsrum Motor Design Change – 230V
d. KM070 Heat guard modification
e. Stir Tool Design Changes
f. Beater Shaft Design Change

Safety Information
3
1. This manual is NOT intended as a comprehensive repair guide to the appliance.
2. It is intended for use by suitably qualified persons with relevant technical competence,
the applicable product knowledge and suitable tools and test equipment
3. Servicing and repair of electrical appliances must be undertaken with the appliance
disconnected from the electrical supply
4. Before servicing the appliance must be checked for earth continuity and Insulation
resistance to establish if any pre-existing fault condition exists.
5. Persons carrying out repairs should use personal protective equipment (PPE) as
necessary to guard against sharp edges on metal and plastic parts.
6. When dismantling take care when removing covers not to damage any wiring which
may be connected to them.
7. Do not use excessive force when disconnecting/reconnecting wiring connectors. Also
ensure that wiring connectors and cables are replaced back in their original position
and any cut cable ties are replaced.
8. Some appliances utilise tamper-proof fixings, the correct tools must be used to release
these fixings and they must always be replaced.
9. After servicing is completed the appliance must be rechecked for Electrical Safety and
functionally tested.
10. All reasonable has been taken to ensure that the information contained in this Manual
is correct at the time of publication. The continued development of products can result
in specifications and parts being modified and the information provided herein may
not be completely up to date.

Safety Information
4
Portable Appliance Testing Information
Portable Appliance Test instruments must only be used by qualified persons. This general
guidance forms part of a full PAT inspection and must be read in conjunction with the PAT
tester user instructions and any current testing legislation and standards. Best practice safety
precautions must be taken.
Kenwood KM070 / KM080 series:
•Product is Class 1 type
•Connect the earth test probe to the planet hub nut as shown below
•Carry out Earth Continuity and Insulation Resistance tests according to the guidance
provided with the PAT test instrument.

Specifications
5
Cooking Chef – Major
Key Features
•Powerful 1500W Planetary Mixing
•1100W Induction Cooking System
ocooks directly in the mixing
bo w l
•
L a r g e 6.7 L bowl capacity
owith market leading
3L cooking a nd mixing ca p ac ity
•Accurate temperature setting from
20 ° C to 140 ° C
•
D isplay
o
f ea t u ri n g 3 hour timer and temperature s
•8 Mixing
S p ee ds
•3 Cooking Stir s
e ttings
•High Speed Heat and Whisk
F un c ti o n
•Steaming basket
•Interlocked Head Lift, Bowl, Heat Shi
e ld and Attachment Outlet Covers
•Durable ceramic paint
•Versatile Bowl t
oo ls
oNew stainless steel Stirring t
oo l
oNew high
temperature Flexible B ea t e r
oNew Power
w h isk
oNew stainless steel spiral Dough
H oo k
oStainless steel K
B ea t e r
Product
•Size (cm) 38H x 41W x 33.5D
•Weight 13.6kg inc Bowl and K Beater
•Materials Die Cast Aluminium / Stainless Steel Bowl
•Colours Silver (Ceramic Paint) Brushed Stainless Steel Detail
Packaging
•Standard Pack Size (cm) 56H x 52.5W x 67.5D
•Packed Weight 27kg

Features & Operation
6
Induction Cooking
Induction cooking is an advanced cooking method that employs the principles of
electromagnetic induction. When an electric current is passed through a copper coil in the
induction cooking area it creates an electro-magnetic field. When the COOKING CHEF bowl is
locked into position the circuit is completed by a special layer of stainless steel in the bowl base.
In turn this creates a large amount of thermal energy that passes through to the contents of the
bowl, thus heating the food.
Principles of Induction Heating
Thermal Energy Created
General Electro Magnetic Field
Current passing through Copper Coil
Heating Efficiency
Induction cooking is extremely energy efficient because it only produces heat in the base of the
bowl. Other heating methods such as gas hobs waste almost 50% of the heat energy around the
sides of the pan. The Induction cooking area on your COOKING CHEF only feels hot during and
immediately after cooking because of the heat transferred back from the contents of the bowl.
This means that Induction cooking is very efficient, very safe and very clean.
For descriptive purposes only

Features & Operation
7
Display
Display
The LCD display can be toggled to display
either the timer or the temperature.
The timer
It shows either minutes/seconds or
hours/minutes.
The temperature is displayed in °C. This
display also shows error codes
indicating interlock errors and technical
errors.
LED lights flash to indicate that heating,
stirring and fold/pulse actions
are in operation.
Timer operation
• The timer will only count up or down when
a mixing or stir function is selected via the
speed control knob.
• The timer can only be set (or re-set) when
the machine is stopped.
• The timer is set in 5 second increments.
When mixing
•When started the timer will count up,
unless the timer has been set by using the
+/- buttons. Mixing will continue until the
timer reaches 3 hours, at which point the
mixing will stop and there will be an
audible sound. This will also switch the
heating OFF.
•If the timer has been set by using the +/-
buttons, the timer will count down when
mixing is started. Mixing will continue until
the timer counts down to 00:00, at which
point the mixing will stop and there will be an
audible sound. This will also switch the
heating OFF.
•The timer will pause if the speed control is
rotated to the “0” position and will start again
when it is rotated back to any ON position.
Whilst stopped, the elapsed time will be
displayed.
•The timer can be reset to 00:00 by pressing
the + and - buttons at the same time for 0.5
seconds.
•The timer is limited to 3 hours maximum.

Features & Operation
8
Temperature Measurement
Temperature measurement
The heat function is only available whilst
mixing. During heating the temperature LED
will pulse on and off. The LED will remain on
while the temperature is +/- 5°C of the
required setting.
When heating water to a temperature of
100°C, the accuracy is +/- 5°C.
The different consistencies of food make it
harder to be completely accurate.
The temperature of the bowl and its
contents are controlled by two probes
located in the bowl seat of the machine.
These probes work together to ensure that
the temperature does not get too high.
One probe (NTC) measures the heat of the
contents of the bowl. The other probe
(NCT2) measures the temperature of the
aluminium – the input heat. The onboard
computer compares these two
temperatures. The input heat cannot go
more than 25% over the bowl temperature.

Features & Operation
9
The Bowl
Bowl
Maintaining the large 6.7L fill capacity of the
existing Major bowl, our COOKING CHEF
bowl takes things a step further. It is a
unique interlocked bowl comprising a
special base for induction cooking. Of
course, this bowl can also be used for cold
mixing.
The standard major bowl will also fit and
work on COOKING CHEF for cold mixing only.
MAJOR size plastic bowl will not fit.
Material
The outside of the bowl is made from
stainless steel.
Inside the base, aluminium is used to
conduct the heat more evenly.
Size
The total capacity of the bowl is 6.7L. The
maximum heating capacity is 3L and
is marked inside the bowl.
Special Base
For induction heating (see diagram).
Handles
The handles have a soft grip material that is
cool to touch and provides a reliable grip.
Cleaning
The bowl can either be cleaned in a
dishwasher or by hand.
Thickness
1mm.
Induction
Stainless Steel
Stainless Steel
Aluminium

Features & Operation
10
Speed Control
Stirring Speeds
The stir settings are suited to cooking when
using the high temperature flexible beater
or the stirring tool. They will ensure that
food is gently mixed during cooking for even
heat distribution.
Stir 1 – constant very slow speed mix around
22rpm
Stir 2 – intermittent 2½ revolution stir every
5 seconds
Stir 3 – intermittent 2½ revolution stir every
30 seconds
Mixing speeds
The machine has a fully variable speed
control with pulse and fold functions for
maximum controllability.
This means you get precise power at all
times regardless of how much mixture is in
the bowl.
There are 8 mixing speeds:
Min – 1 – 2 – 3 – 4 – 5 – 6 - Max.
Temperature Speed Limiter
Once the bowl has reached a temperature of
60°C or above, the speed is limited.
After heating, when the temperature is
falling, to select a higher speed the knob
must be moved to a position below speed 2
to re-set.
High speed heat and whisk allows the more
experienced cooks to perform a high
speed/high temperature whisking operation
as required by some recipes.
Pulse is also limited during heating.

Features & Operation
11
Safety Interlocks
Five Interlocks are fitted to this machine for
safety. If an interlock is activated, particular
functions will not work if selected. If an
interlock is activated and a function is
selected which is not available, a warning
sound and error message will alert the user
(for example, ‘E:01’).
See Page xx for details of all Safety Interlock
error messages.

Features & Operation
12
Gearbox
Composite gears reduce the noise of the
gearbox
Antivibration mounts help eliminate noise
and vibrations.
The motor is mounted direct to the gearbox
providing a one piece power unit.
The complete power unit is rubber mounted
to reduce noise and vibration.
All gears have increased sizes to improve
strength and life.
Composite internal gears to reduce noise.
First stage reduction ratio increased to
reduce gear speeds to reduce noise.
Gear Ratios
Composite Gears
Ring Gear
Planet Hub Gear
Antivibration
Mounts
The COOKING CHEF uses the same
attachment outlets as Titanium Major,
supporting the bowl planetary mixing
outlet with our versatile slow, medium
and high speed outlets.
The functionality of the COOKING
CHEF can be enhanced further by the
use of a selection of Chef Major
Attachments.

Disassembly Instructions
13
Head Assembly
1. Remove the medium/high speed outlet
covers from the top of the machine, and
the slow speed outlet cover from the
front of the machine.
2. Please note the correct position of the
spigots prior to removal. Remove the four
indicated screws to remove the spigots.
Next, lift off the spigot seat plate.
3. Remove the three indicated T15 screws from
the top of the top cover, and the two from
underneath, to allow the top cover to be
removed, but be aware that there are
connected wires within the top cover so it
cannot be immediately pulled away.
4. Please note the correct alignment of the
front gearbox mount through the slow
speed outlet to ensure it is not crimped
on reassembly.

Disassembly Instructions
14
5. When removing the top cover, you need to
undo the connection to the interlocks
contained within the top cover.
6. The correct alignment of the interlocks for
the slow speed and medium/high speed covers.
8. IMPORTANT - The
gearbox must be
earthed to the body,
where circled.
Between the rear of the gearbox and the
body casting is a metal spacer (arrowed). Be
careful not to lose this when you remove the
gearbox as it is not fixed in position.
9. The gearbox is
secured by three
hexagonal bolts.

Disassembly Instructions
15
10. The Motor is secured by three screws
11. Dismantling the gearbox involves
removal of the large pulley. First remove the
drive belt (1).
Fit a stall plug into the slow speed outlet, and
if necessary, use a screwdriver to rotate into
position. Undo the gearbox pulley by hand,
turning anti-clockwise (2), and pull upwards to
remove (3).
12. During reassembly, ensure all three
motor bosses are fully located within the
gearbox casting assembly before fully
securing. When reassembled, run the motor
and check that the motor cooling fan is not
rubbing due to incorrect fixing of the motor
and that the drive belt is not rubbing against
the wiring loom.
12. The hub nut is secured by an engineering
adhesive, and may prove difficult to remove.
With the stall plug fitted, using an 8mm
socket, turn anti-clockwise to loosen. Lift the
hub straight up to remove. When refitting the
hub nut, it is important to apply threadlock
60026 to the hub nut prior to reassembly.

Disassembly Instructions
16
13. Lower gearbox cover in situ, showing the
correct position of the heatguard interlock.

Disassembly Instructions
17
Base and Induction Assembly
14. The correct alignment of the two NTCs
through the high temperature seat pad.
15. To remove the base moulding, first
remove the six feet, and then undo the T15
screw under each foot. When reinserting
the feet, ensure the correct alignment.
16. The base moulding and induction assembly
can be removed after disconnecting the three
power connections as shown.
17. Also disconnect the red and white wires
from the opposite site of the induction PCB,
and the two connectors from the rear of the
PCB. Please be aware that these are locking
connectors.

Disassembly Instructions
18
18. Only remove the cable tie holding the two
cables to the induction PCB cover if necessary,
before lifting the whole base moulding /
induction assembly free. Please note that a
cable tie must be reapplied prior to
reassembly/re-fixing of the induction
assembly. This will require the removal of the
induction PCB cover to fit the new cable tie.
19. The base moulding and induction
assembly complete, after separation from the
body of the machine.
20. To remove the induction PCB cover, undo
the six indicated T15 screws.
21. The PCB cover can be lifted off from the
PCB, but only a short way, due to the leads
connecting the fan held within the PCB cover
to the induction PCB assembly itself.
Disconnect this cable from the PCB to remove
the PCB cover and fan completely.

Disassembly Instructions
19
22. The induction PCB assembly rests on four
pegs on the base moulding, and can be lifted
straight up and off the base moulding.
23. The reverse of the induction PCB assembly.
24. The underside of the machine, with base
moulding and induction assembly removed,
showing the induction coil and inside the
pedestal.
25. To remove the induction support casting
from the pedestal, remove the 6 screws (yellow
arrows) – these screws should be secured using
Threadlock 60026. Be aware of the (bowl
interlock) reed switch (circled) below the
support casting. It is not fixed but just slotted
into place. Once the support casting has been
lifted off, the spring holding the exhaust grille
can be unhooked (red arrows), if required.