Technical Overview; Chassis; Drawer Fronts; Electronics - Fisher & Paykel DishDrawer DD605 Service Manual

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TECHNICAL OVERVIEW

3.1

Chassis

The DishDrawer™ chassis is one complete assembly composed of 5 steel metal components locked together by a
proprietary riveting process. The chassis exterior is made of a lacquered electro-galvanised material.
Unlike most other dishwashers, the chassis assembly is a load carrying structure designed to impart stiffness to the
product and to ensure deflection is minimised.
The feet of the double cabinet are assembled into the chassis by means of four steel inserts that are clinched in place to
form a permanent threaded connection.
The tub extends 520mm (20
tub.
3.2

Drawer Fronts

Prefinished drawer fronts are formed from a painted, brushed or Iridium finish stainless steel blank. The drawer fronts
are attached to the tub by means of formed hooks and two pins that are inserted through either side of the tub.
On the integrated model, the front panel supplied on each drawer is the mounting panel for the joinery finished drawer
front. The joinery finished drawer front is supplied by the customer.

3.3 Electronics

In the DD605/ DS605 (Phase 5) electronic controller, the functions of 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 switch mode power supply. This power supply utilises a large
dropping resistor on the heater plate in conjunction with phase control of the mains voltage in order to produce a variable
voltage supply for the motors, solenoids and drying fan. From this the controller can supply voltages from 5V to 85V to
the various components in the DishDrawer™.
A separate 24volt dc power supply on the PCB mains filter board (located within the mains filter housing in the lower left
corner of the chassis) supplies power to the microcontroller and LEDs in the electronic controller.
An isolation relay is mounted on the PCB mains filter and will disconnect power to major components when signalled to
by the controller under certain fault conditions. Once the fault has been cleared, it will require the power to be
disconnected from the product for the isolation relay to reset.
NOTE: - With power supplies of this nature, all components, regardless of supply voltage, should be treated as
live to earth. i.e. at supply voltage.
The user interface comprises a printed circuit board for front controls and a touch switch panel for internal controls.
The electronics can connect to a computer service tool via an optical light pen for fault finding and product information.
The element is switched by one single pole relay. Overheat protection is provided by a thermal fuse in series with the
water heater track on the heater plate. In an over-heat situation, this gravity fuse drops off and disconnects the water
heater element from the supply voltage.
A non-serviceable fuse is mounted within the controller to provide additional safety protection.
/ ") out of the cabinet by travelling along two rigidly attached slides on either side of the
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