20
6-9 POWER SUPPLY TROUBLE SHOOTING CHART
BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM
POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 58V - 145V
(DEPENDING EPENDING UPON H.SYNC FREQUENCY)
(B)
CONSTANT OUTPUT : 6.3V, 14V, -12V, 78V
BEAD SET
ABNORMAL VARIABLE OUTPUT
NG
OK
NG
OK
OK
NG
NG
OK
OK
NG
OK
NG
YES
NO
CHECK BRIDGE
RECTIFIED CIRCUIT
CHECK IC901 PIN4
VOLAGE ABOUT 32V
CHECK IC401
CHECK D919
CHECK Q911
Q911 FAILURE
CHECK IC901
CHECK AC LINE
VOLT 120V OR 220V
CHECK F901, SW901
CHECK LINE RECTIFIED
& SMOOTHED VOLT
CHECK T901 O/P
MAKE SURE THAT
THE VARIABLE
OUTPUT IS NOT SHORTED
OK
PIN 14, 15, 16, 28, B+
DRIVER
IC401 29(ABOUT 11.5V)
CHECK 56V, 14V, 6.3V,-12V
CIRCUIT OUTPUT
CHECK THE 53V
CHECK C921,ZD903,D912,
C910,D911,T901
NG
Summary of Contents for E773c Series
Page 16: ...16 6 2 ABNORMAL DISPLAY 1 NO SIGNAL ON SCREEN ...
Page 21: ...21 7 MECHANICAL OF CABINET FRONT DIS ASSEMBLY ...
Page 38: ...38 9 BLOCK DIAGRAM IC801 NT6812K ...
Page 39: ...39 9 1 BLOCK DIAGRAM SMPS ...
Page 41: ...41 ...
Page 42: ...42 IC801 NT6812KG ...
Page 43: ...43 ...
Page 44: ...44 IC901 STR G5643D 1 2 3 4 5 D S GND VCC OCP FB ...
Page 45: ...45 11 PCB LAYOUT ...
Page 46: ...46 ...
Page 47: ... 47 12 CHEMATIC DIAGRA ...
Page 48: ...48 ...
Page 49: ...49 ...
Page 50: ...50 ...