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Merrychef MD0750 User Manual

Merrychef MD0750
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Page 8 MD Series Ovens 32Z3329 Issue 6
Procedure B - Simplified Power Test
You will need:
A thermometer capable of reading to ±0.1°C.
A Polypropylene tray approximately 200mm x 200mm.
A measuring jug.
A calculator.
Water which is at a temperature of 10°C ± 2°C.
1 Measure 1 litre of cold water into the tray using the measuring jug.
2 Measure the water temperature, and record it as T[s].
3 Place the tray in the oven and close the door.
4 Turn the oven on.
5 Set the timer to 1:02.
6 Press the “100%” pad.
7 When the oven bleeps, open the door and remove the tray.
8 Stir the water thoroughly, and measure its temperature. Record this as T[e].
Calculation:
1 T[r] = T[e] - T[s].
2 Power = 78.5 x T[r]. Power is in Watts.
The power given by the above test should be within ±15% of the rated power.
Procedure C - Power Transformer Test
You will need:
A Digital Multi-meter (D.M.M.)
A Megger or similar resistance meter using 500V d.c.
1 Isolate the oven from the mains supply.
WARNING: High voltages and large currents are present at the secondary winding and filament
winding of the Power Transformer. It is very dangerous to work near this part when the
oven is on. NEVER make any voltage measurements at the High Voltage circuits,
including the magnetron filament.
WARNING: Even when the oven is not cooking, the Power Transformer has High Voltages present
because of the Soft Start circuit. Isolate the oven before testing.
Mains winding between tags P & P
Approx. 1.3
High Voltage winding
(between tag S & chassis)
Approx. 82
Filament winding
between terminals F & F
Less than 1
Primary winding P and chassis
Pass if over 10 M
Filament winding F and chassis
Pass if over 10 M
2. Ensure that the High Voltage Capacitor is discharged before commencing work.
3. Remove all connections from the Power Transformer.
4. Using a D.M.M., check the continuity of the windings. Results should be as follows:
5. Using a Megger, test the insulation resistance between:
One end of the High Voltage winding is connected to the chassis, so this is not tested.

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Merrychef MD0750 Specifications

General IconGeneral
BrandMerrychef
ModelMD0750
CategoryMicrowave Oven
LanguageEnglish

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