Daewoo KOG-366T0S, Руководство по обслуживанию, Страница: 42 / 56

1. CIRCUIT CHECK PROCEDURE
1) Low voltage transformer (DMR-814FS) 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 (MICOM PIN)
CHECK METHOD
NO. CHECK POINT REMARK
1 PIN 21,24,32,33 OR 34 -5VDC
2 PIN 48 -27VDC
3 PIN 44
4 PIN 18 OR 19
5 DP1 PIN 1& 25 2.6VAC (DISPLAY FILAMENT VOLTAGE)
1 MP1 -5V DC Replace Q4, EC2
2 MP2 -16V DC Replace R6, EC3
3 MP3 -24V DC Replace D12, D13, EC4
C-D -19VDC -24VDC
E-F 2.1VDC 2.2VAC
41
NO. MEASURE POINT WAVE FORM REMARK
Voltage
Terminal
LOAD NO LOAD
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 acceptable tolerance of the secondary voltage is within ±5% of nominal voltage.
NOTE: Each measure point must be measured with GND points.
T:20ms (50HZ)