PRINTED CIRCUIT BOARD <KOG-371R0S, KOG-391R0S>
1. CIRCUIT CHECK PROCEDURE
1.Low voltage transformer check
The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage: 230V / Frequency: 50Hz
Terminal Voltage | LOAD | NO LOAD |
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AC 25.8 V | AC 28.4 V | |
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NOTE
1.Refer to Ciruit Diagram (point 4).
2.Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage.
3.The allowable tolerance of the secondary voltage is within ± 5% of nominal voltage.
2.Voltage Check - Key check point
NO | CHECK POINT | REMARK |
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1 | IC1 PIN 2, 21, 30, 34 | |
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2 | IC1 PIN 35 |
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T : 20ms(50Hz)
3
IC1 PIN 31 OR 32
T : 250 ns(4MHz)
- Check method
NO | MEASURE POINT | WAVE FORM | REMEDY | REMARK |
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1 | MP1 | DC | Replace VL1, EC1 | NO LOAD |
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2 | MP2 | DC | Replace EC2, D6, 11, 12 | NO LOAD |
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NOTE
Each measure point must be measured with GND points.
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