Alignment And Adjustments; High Voltage Transformer; Low Voltage Transformer; Magnetron - Samsung SMH7177STE Service Manual

5. Alignment and Adjustments

1. High voltage is present at the high voltage terminals during any cook cycle.
2. It is neither necessary nor advisable to attempt measurement of the high voltage.
3. Before touching any oven components or wiring, always unplug the oven from its power source and dis-
charge the high voltage capacitor.

5-1 High Voltage Transformer

1. Remove connectors from the transformer terminals
and check continuity.
2. Normal resistance readings are as follows:
Secondary
Filament
Primary

5-2 Low Voltage Transformer

1. The low voltage transformer is located on the
control circuit board.
2. Remove the low voltage transformer from the
PCB Ass'y and check continuity.
3. Normal resistor reading is shown in the table.

5-3 Magnetron

1. Continuity checks can indicate only an open
filament or a shorted magnetron. To diagnose an
open filament or shorted magnetron :
2. Isolate the magnetron from the circuit by
disconnecting its leads.
3. A continuity check across the magnetron filament
terminals should indicate one ohm or less.
4. A continuity check between each filament terminal
and magnetron case should read open.
PRECAUTION
SHV-U1870AR
80.5 Ω +2%
Shows Continuity
1100W 0.330 Ω + 2%
1000W 0.375 Ω + 2%
- 14 -
(Room temperature = 20°C)
Filament Terminals
Primary
Terminals
Terminals
1~2(Input)
4~5(Output 2.7V)
6~7(Output 7.0V)
7~8(Output 19.0V)
Magnetron Antenna
Gasket Plate
Cooling Fins
Secondary
Terminal
Resistance
SLV-1350U(P)
127.7 Ω
1.8 Ω
2.0 Ω
4.8 Ω