Tuscany NYMWB23A1 User manual

SERVICE
MANUAL
Disclaimer
The information contained in this Service Manual
is intended for licensed service personnel only.
NYMWB23A1
23L MICROWAVE

CAUTION
2
WARNING: Repairs must be done only by a qualied ser vice person.
In order to prevent electric shocks:
• Before performing maintenance or repair, turn the appliance o and disconnect it from the power
supply.
• Do not touch the housing or frame of the microwave if the appliance is deemed faulty. These
components may be live.
• Ensure that the high-voltage capacitor is discharged before proceeding with any repair.
• If tests have to be performed while the appliance is live, always use a residual-current-operated circuit
breaker.
• Do not test the high-voltage circuit while the appliance is in operation. DANGER OF DEATH!
Once the repairs are completed, conduct a functional test.
PRODUCT SPECIFICATIONS
Dimensions
Voltage / Frequency
Rated Power
Microwave Power
Capacity
Turntable diametre
Net weight
W485 x D405 x H293mm
220 -240V~ / 50Hz
1250W
800W
23L
ø 270mm
13.7kg

EXPLODED VIEW
3

EXPLODED VIEW
4

PARTS LIST
5
ID Part Number Description
C00
C35
C41/C55
C18
C06
T03
W02
W01
W03
L01
L02
L04
2899913
2899514
2899914
2899515
2899413
2899915
2899414
2899415
2899505
2899916
2899412
2899516
CONTROL PANEL ASSEMBLY - MW23L
BUTTONS PCB
SILICA GEL PAD
MAIN PCB
BUTTONS (ROW)
TURNTABLE RING ASSEMBLY
FAN BLADES
FAN FRAME
FAN MOTOR
DOOR LATCH
INTERLOCK LEVER
MICROSWITCH (monitor)
L03
W04/C43
E13
T02
E06
E07
B02
Z01
2899517
2899408
2899518
2899416
2899519
2899513
2899917
2899104
MICROSWITCH (interlock)
LIGHT COVER
LIGHT
COUPLER
CAPACITOR (high voltage)
DIODE (high voltage)
FOOT
BRACKET FOR HIGH VOLTAGE CAPACITOR
B03 2899105 LOWER HINGE
A01 2899906 SPLASH COVER
T04 2899801 TURNTABLE GLASS PLATE (270mm)
T01 2899503 TURNTABLE MOTOR
E35 2899520 THERMOSTAT 160ºC/95ºC *V
Z24 2899106 OUTER CASE
E16 2899522 POWER CORD
E29 2899521 THERMOSTAT 70/59ºC *H
E01 2899510 MAGNETRON
G03 2899522 GRILL ELEMENT

PARTS LIST
6
ID Part Number Description
E05
D00
D04
D03
D02
D15+D16
E10+E11
2899523
2899918
2899919
2899200
2899416
2899920
2899524
TRANSFORMER (high voltage)
WHOLE DOOR ASSEMBLY
TOP HINGE ASSEMBLY
SPRING FOR DOOR LATCH
DOOR LATCH
DOOR HANDLE
NOISE FILTER AND FUSE ASSEMBLY

WIRING DIAGRAM
7
TCO.

TROUBLESHOOTING
8

TROUBLESHOOTING
9

TROUBLESHOOTING
10

TROUBLESHOOTING
11

TROUBLESHOOTING
12

REPAIRING THE MICROWAVE
13
Following the steps bellow will provide you access to the Turntable Motor.
1 – Remove the turntable glass plate.
2 – Carefully remove the turning sha.
3 – Lay the unit down on its back.
4 – Remove the cover of the turntable motor. Use pliers to pinch the clips that hold the cover in position.

CRITICAL COMPONENTS
14
CRITICAL COMPONENTS
1. High-voltage diode
The high–voltage diode can be tested the same way a standard diode is tested.
• The diode should present full continuity in conduction direction.
• The diode should present innity resistance in blocking direction.
2. High-voltage capacitor
The high-voltage capacitor can be tested by resistance measurement (range 20MΩ)
The resistance between the connector of a capacitor in good working condition presents momentary
continuity followed by a resistance increase proportional to the load.
A defective capacitor presents short-circuit (continuity) permanently between its connectors.
The resistance between the connectors and the housing should be innite.
3. High-voltage transformer
This transformer supplies high voltage to the magnetron and also the operating voltage to the heater.
- Input voltage – 220-240V~
- Heater voltage – 3.3V~
- Operating voltage approx. – 2300V~
WARNING: DO NOT ATTEMPT TO MEASURE THE OPERATING VOLTAGE.

CRITICAL COMPONENTS
15
4. Magnetron
The magnetron can be tested by ohmic measurement only. The resistance between the terminals F and FA
should be lower than 1Ω.
The resistance between any of the terminals and the housing should be innite.
NOTE: An internal short-circuit between the cathode and anode cannot be detected by simply measuring
the terminals. This short-circuit is only detectable when the appliance is on and high voltage is being
supplied to the magnetron. Loud humming noises are also an indication of a defective magnetron.
Before installing the magnetron, ensure that the metal seal is placed correctly on top on the magnetron as
per image below.
5. Safety Switches
At least 3 safety switches can be found in most microwaves models. These switches are responsible for
interrupting the generation of microwave energy as soon as the door is opened.

CRITICAL COMPONENTS
16
The short-circuit switch works as a safety device in case one of the safety switches doesn’t function when
required. If the short-circuit switch is activated, it will not be possible to turn the microwave on.
Safety switches operation sequence:
Open door
Safety switch on the right > Safety switch on the le > Short-circuit switch
Close door
Short-circuit switch > Safety switch on the le > Safety switch on the right

NOTES
17

CONTACT
We are committed to ongoing research and development. Every eort has been made to ensure all information in the
service manual is correct at time of going to print. Dimensions should be used as a reference only and actual
dimensions should be taken from the physical product.
Tuscany Customer Care
1300 985 815
[e-mail]
PO Box 7785, Baulkham Hills, BC NSW 1755
Version 1.1