Daewoo KOC-970T1S, Руководство по обслуживанию

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PRINTED WIRING BOARD
1. CIRCUIT CHECK PROCEDURE
(1) Low Voltage Transformer(DMR-101FS) 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 ( 1~4:Micom Pin, 5:Display Pin )
- Check method
KOC-970T/980T
L.V.T. : DMR-101FS
Terminal Voltage
1 - 2 230VAC/50Hz
4 - 5 13.0 VAC
6 - 7 35.0 VAC
8 - 10 3.0 VAC
NO CHECK POINT REMARK
1 P IN 63, 64 0 V
2 P IN 29, 32, 62 -5 VD C
±
5%
3 P IN 45
4 P IN 30, 31
5 P IN 1, 25 2.6 VAC (D isplay filam ent voltage)
NO VOLTAGE REM ARK
KOC-970T/980T
1 -5 V D C R eplace R 24, J3, Q 10
2 -12 V D C R eplace D 1~D 6, J8
3 -27 V D C R eplace R 28, R 29, ZD 4
The m arks of the above corresponding voltages (+5, +12, -24V D C ) are w ritten on the PC B .
E ach m easuring points m ust be m easured w ith G N D points.
NOTE