4
Service & Parts Manual original Instructions
Part Number 32Z3812 US
Issue 1
SAFE
TY &
REGUL
ATIONS
Important:
1.1
This manual provides technical guidance for engineers
who have successfully undertaken a recognised product
familiarisation and training course run by Merrychef to carry
out service/repair tasks to the appliance/s shown on the
front cover of this manual which must not be used for any
other make or model of appliance.
Please remember that it is wiser not to attempt a service task
if you are unsure of being able to complete it competently,
quickly, and above all safely.
To avoid injury to yourself or others and to protect the
appliance from possible damage, ensure you have read and
understand all the relevant instructions and ALWAYS follow
the Safety Codes when servicing an oven.
Before attempting to repair the oven, check the oven
1.1.1
for microwave emissions using a calibrated microwave
emission detector.
Check that the oven is not emitting microwaves, even
1.1.2
when supposedly not in operation.
Check that the oven is not operating continuously,
1.1.3
whether the display indicates cooking or not.
Never manipulate the mains power lead whilst it is live.
1.1.4
Before removing the oven casing ALWAYS isolate the
1.1.5
oven from the mains electricity power supply; switch off
and disconnect the oven plug from the wall socket, turn off
isolator switch to disconnect fixed wired ovens. NOTE: The
oven switch does not provide adequate protection against
electric shock as it does not isolate all of the internal wiring
from the mains.
The equipment must be locked-off to prevent the oven
1.1.6
from being inadvertently powered up.
Do not leave the oven unattended without the oven
1.1.7
panels fitted and keep within sight of other personnel
when testing the oven, ensuring persons other than trained
engineers are denied access.
The minimum number of panels should be removed
1.1.8
and the HT capacitors must be discharged before working on
the oven using a suitably insulated 10 MΩ Resistor.
Temporary insulation should be used to prevent
1.1.9
accidental contact with dangerous conductors.
Do not touch any internal wiring within the Oven,
1.1.10
whether you believe it is live or not and avoid touching the
Metalwork (Casing, Panels, etc) of the Oven with your Body.
Only use electrically rated screwdrivers for adjusting
1.1.11
‘Pots’ etc., ensuring the tool touches nothing else.
Ensure the Test Equipment is set correctly before use.
1.1.12
Test equipment such as meter test leads or clamps
1.1.13
must be fitted and removed whilst the unit is dead, for each
and every test.
Do not undertake functional Magnetron testing with
1.1.14
the oven panels removed.
Avoid touching the Test Equipment, unless necessary
1.1.15
for the operation.
Upon completion of a service follow the steps for
1.1.16
‘Commissioning the oven’ under the Commissioning section
of this manual.
SAFETY REQUIREMENTS
1
DANGER:
BEFORE REMOVING THE OVEN CASING, ISOLATE
THE OVEN FROM THE MAINS ELECTRICITY
POWER SUPPLY; SWITCH OFF, DISCONNECT
OVEN PLUG FROM WALL SOCkET, TURN OFF
ISOLATOR SWITCH TO DISCONNECT FIXED
WIRED OVENS AND LOCk-OFF.
WARNING:
ALWAYS DISCHARGE THE HT CAPACITORS
BEFORE WORkING ON THE OVEN USING A
SUITABLY INSULATED 10MΩ RESISTOR.
IF SMOkE IS OBSERVED:
SWITCH OFF THE OVEN - DISCONNECT/ISOLATE
FROM THE ELECTRICAL SUPPLY -
kEEP THE OVEN DOOR CLOSED TO STIFLE ANY
FLAMES.
CAUTION
WARNING TO SERVICE TECHNICIANS
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING
SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE
MICROWAVE ENERGY
Do not operate or allow the oven to be operated
1.1.17
with the door open.
Make the following safety checks on all ovens to
1.1.18
be serviced before activating the magnetron or other
microwave source, and make repairs as necessary:
Interlock operation.
●
Proper door closing.
●
Seal and sealing surfaces (arcing, wear, and other
●
damage).
Damage to or loosening of hinges and latches.
●
Evidence of dropping or abuse.
●
Before turning on microwave power for any
1.1.19
service test or inspection within the microwave
generating compartments, check the magnetron,
wave guide or transmission line, and cavity for proper
alignment, integrity and connections.
Any defective or misadjusted components in the
1.1.20
interlock, monitor, door seal, and microwave generation
and transmission systems shall be repaired, replaced, or
adjusted by procedures described in this manual before
the oven is released to the owner.
A microwave leakage check to verify compliance
1.1.21
with the Federal Performance Standard for the U.S.A. or
the Canadian Regulation, HEALTH AND WELFARE, SOR/79
920 for Canada must be performed on each oven prior to
release to the owner.
