Fisher & Paykel DishDrawer DD603 Service Summary

Service Summary
This information is intended for use by individuals possessing adequate backgrounds of electrical, electronic and mechanical experience.
Any attempt to repair a major appliance may result in personal injury and property damage. The manufacturer or seller cannot be
responsible for the interpretation of this information, nor can it assume any liability in connection with its use.
If further help is needed concerning this appliance call: TOLL FREE 1 0800 9 FNP USA
or write to: Fisher & Paykel Appliances Inc., 27 Hubble, Irvine, CA 92618
CAUTION:
This machine must be electrically grounded through the grounding lead in the 3-prong power cord, if plugged into a properly
grounded appliance outlet or through a separate No. 14 AWG or larger wire from the cabinet to an established ground. In all cases the
grounding method must comply with any local electrical code requirements. To reduce the risk of shock, disconnect the power supply
cord before servicing.
CAUTION: ALL TERMINALS AND INTERNAL PARTS SHOULD BE TREATED AS LIVE.
If grounding wires, screws, straps, clips, nuts or washers used to complete a path to ground are removed for service, they must be returned
to their original position and properly fastened.
Electronics
In the DD603 and DS603 electronic
controller, the functions controlling the
motor as well as controlling the user interface
console have been combined into a single
16-bit Micro Controller on the main printed
circuit board.
This Micro Controller also controls a
transformerless 85W switchmode power
supply. This power supply utilizes a large
dropping resistor on the heater plate in
conjunction with phase control of the mains
voltage in order to produce a variable voltage
rail. From this the controller can supply
voltage from 5V to 85V to the various
components in the DishDrawer.
The user interface comprises a printed circuit
board for front controls and a touch switch
panel for internal controls.
Dispensing Detergent
The Detergent Dispenser door is opened
manually for detergent loading and then
manually closed ready for the detergent to
be transported to the wash tub by the inlet
water. To enable each detergent chamber
to be dispensed separately, an inlet water
diverter valve controlled by the electronics
is necessary.
Additionally a positive displacement pump
unit and storage tank are incorporated within
the dispenser to supply rinse agent. The
rinse agent dispensed volume may be
adjusted to suit water conditions. A glowing
red light on the tank filler cap indicates an
empty rinse agent tank.
The Element
The heater plate is an element consisting of
a porcelain enamelled steel plate with a
thick film resistive circuit printed onto the
dry side. As well as the heating circuit a
large dropping resistor is also printed onto
the heater plate which forms part of the
controllers power supply. The element is
clamped in place by a lockring nut and
supports the motor at the base of the tub.
The heater plate is only activated during
the wash cycles. It is not used for drying.
The temperature is maintained by a
thermistor. If a failure occurs with the
electronic control of the heater plate
overheat protection is provided by a
thermal fuse on the heater plate itself.
IMPORTANT SAFETY NOTICE
IMPORTANT - RECONNECT ALL GROUNDING DEVICES
Tub Home Sensor
A tub home sensor is used to determine when
the tub is closed and it is safe to start a cycle.
The tub home sensor consists of an infrared
sender and receiver mounted on the circuit
board in the controller.
Infrared light is transmitted from the sender
down an optical light pipe to the side of the
tub. The infrared receiver also has an optical
light pipe leading from it out to the side of
the tub. When the tub is closed, the two
light pipes are optically connected via a
prism mounted in the trim on the front of
the chassis.
Drying Cycle
The fan draws air through the tub, where it
absorbs water from the dishload. The
moisture laden air is then mixed with a large
quantity of ambient air (from the kitchen),
to minimize the amount of vapor visible
when exiting from the drawer front.
The fan runs continuously during the
drying cycle and will restart if the tub is
opened and closed again. After the drying
cycle is complete, the fan continues to run
for 30 minutes, but will not restart if the tub
is opened.
Tub Removal
1. Open the drawer fully.
2. Depress the right-hand tub clip and
push it back about 1
Repeat for the left-hand side.
3. The tub may now be lifted up off the
drawer runners.
4. If turning it over, rotate the tub
counter clockwise.
4. Slide both runners back into the
product.
5. Refit in reverse manner.
Amount of Water
The tub fills with approximately 0.8 US
gallons of water, almost level with the base
of the sprayarm. Once this level is reached,
the wash pump (which has sensed the fill
via the electronics) becomes primed and
pumps the water through the sprayarm
which will then rotate. The load on the
wash pump is constantly monitored
throughout the wash cycle and the water
level adjusted if necessary.
CAUTION:
ALL TERMINALS AND INTERNAL PARTS
SHOULD BE TREATED AS LIVE.
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Removal of Drawer Front
To remove the drawer front, remove the two
retaining pins on either side of the tub at the
front using a sharp pair of long nose pliers.
Pull the drawer front out slightly at the
bottom and then downwards away from the
handle. Warning: Ensure the mains power
has been disconnected before servicing
the DishDrawer.
Carefully remove the earth wire from the
tab on the drawer front. Components on
the front of the tub are now accessible.
When replacing the drawer fronts ensure
the web in the center of the pin is vertical.
Lid System
The lid is a single piece of polymer plastic
with a static seal co-injection moulded into
it. Each side of the lid is clipped into a yoke
which is in turn connected to a worm drive
gearbox assembly containing a small
brushed DC 24V motor.
At the beginning of each wash cycle, both
motors are powered up for approximately
10 seconds which pulls the lid down onto
the tub. The lid remains down for the
duration of the cycle and is only lifted when
the DishDrawer beeps to signal the end of
the cycle or if the customer pauses it to
gain access to the tub.
If power to the DishDrawer fails with the lid
down, you can still force the tub open
manually if access is required. However,
closing the drawer with the lid down can
damage the lid seal. If power is not available
and the drawer must be closed, remove
the tub, disconnect the lid screw from the
yoke and manually wind up the lid screw.
Reconnect lid screw to yoke and close the
drawer.
Water Softener
Some models are fitted with a Water
Softener, which is designed to remove
calcium, and magnesium ions that cause
water to be 'hard'. The water softener will
automatically remove the hardness from
the water using a salt solution. It must be
set to the correct local water hardness and
must always be filled with granular salt
made especially for dishwasher water
softening systems.
A glowing red light on the Salt Reservoir
Cap indicates the salt reservoir is empty.