Daewoo KOC-972T0S, Руководство по обслуживанию

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PRINTED WIRING BOARD
1. CIRCUIT CHECK PROCEDURE
1. Low Voltage Transformer check
•
The low voltage transformer is located on the P.C.B.
•
Measuring condition (input voltage) : 230 VAC / 50 Hz
Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage.
The allowable tolerance of the secondary voltage is within ±5% of normal voltage.
2. Voltage check
•
Key check point ( 1~5:Micom Pin, 6:Display Pin )
•
Check method
KOC-972T/982T KOC-983T/984T/985T
L.V.T. : DMR -101FS L.V.T. : DMR -984FS
Term inal Voltage Term inal Voltage
1 - 2 230VA C /50H z 1 - 3 230VA C /50Hz
4 - 5 13.0 VA C 6 - 7 10.5 VA C
6 - 7 35.0 VA C 7 - 8 10.5 VA C
8 - 10 3.0 VA C 9 - 10 2.6 VA C
NO CHECK POINT REMARK
1 P IN 63, 64 + 5 V D C
±
5%
2 P IN 29, 32, 62 0 V
3 P IN 28 + 5 V D C
4 P IN 45
5 P IN 30, 31
6 P IN 1, 25 2.6 VA C (D isplay filam ent voltage)
NO VOLTAGE
REMARK
KO C-982T KOC-983T/984T/985T
1 + 5 V D C R eplace Q 3,ZD 2,R 25,C 12 R eplace Q 3,ZD 3,R 26,C 10
2 + 12 V D C R eplace D 2~D 5,E C 3,C 11 R eplace D 7,D 8,E C 2,E C 3,C14,C 11
3 -24 V D C R eplace D 6,EC 4,R 28,R 29,Z D 4 R eplace D 9,D 10,E C 4,E C 5,C 15
T he m arks of the above corresponding voltages (+5, +12, -24VD C ) are w ritten on the P CB .
E ach m easuring points m ust be m easured w ith G N D points.
NOTE