![background image](http://html1.mh-extra.com/html/daewoo/kor-612l0s/kor-612l0s_service-manual_3717579042.webp)
1. CIRCUIT CHECK PROCEDURE
1) Low Voltage Transformer (DMR-604FS) Check.
The low voltage transformer is located on the P.C.B.
Measuring condition: Input voltage: 230V
Frequency: 50Hz
2) Voltage Check
Key check point
CHECK METHOD
1
MP1
DC -5V
¡
0.25
Replace ZD2, EC1, EC2
NO LOAD
2
MP2
DC -30V
¡
1.0
Replace R21, ZD3
NO LOAD
3
MP3
DC-27V
¡
1.0
Replace R21, R22, EC5
NO LOAD
REMARK
NO.
CHECK POINT
REMARK
1
IC1 PIN 6, 10, 11
-5VDC
2
IC1 PIN 1
-30VDC
3
IC1 PIN 22
4
IC1 PIN 8 OR 9
6–7
24V
30V
NO LOAD
41
PRINTED CIRCUIT BOARD
NOTE 1: Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power
source voltage.
NOTE 2: The allowable tolerance of the secondary voltage is within
¡
5% of voltage.
NOTE: Each measure point must be measured with GND points.
Voltage
Terminal
LOAD
NO.
MEASURE POINT
Fig. 6
WAVE FORM
REMEDY
T: 20ms (50Hz)
T: 250 ns
Содержание KOR-612L0S
Страница 44: ...Fig 6 Measurement Point 43...
Страница 47: ...46 2 P C B CIRCUIT DIAGRAM L type...
Страница 48: ...47 3 COMPONENT INFORMATION 1 Transistor 2 Diode and Zener Diode...
Страница 49: ...48 4 PRINTED CIRCUITS BOARD...
Страница 53: ...52 EXPLODED VIEW...