Alignment And Adjustments; Low Voltage Transformer - Samsung DE7712N Service Manual

6. Alignment and Adjustments

6-1 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.
12V
Pri 2
0V
Pri 1
12V
6-2. 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 termi-nals
should indicate one ohm or less.
4. A continuity check between each filament terminal and
magnetron case should read open.
6-3. High Voltage Capacitor and High Voltage Surge-absorber Capacitor.
1. Check continuity of the capacitor with the meter ser at the highest resistance scale.
2. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates
3. A shorted capacitor will show continuous continuity.
4. An open capacitor will show constant
5. Resistance between each terminal and chassis should read infinite.
3 4
2
Sec 2
1
5
(Room emperature = 20  )
.
Terminals
1-2(Input)
2-3(Input)
3-4(Input)
- 15 -
Resistance
SLV-4300B
14.0
16.0
10.0
.