NEC MultiSync 4FGe User Manual

CIRCUIT DESCRIPTION
1. Power Supply Circuit
4 +120V Dropper Circuit t
* +2OV (A)
I-
I
+150V K1
H Deflect ion .
c
+8OV K2
r DC/DC Converter
FBT
+24V K3
High Voltage
DC/DC Converter
Hor
Deflection
-60V
(B)
I
c +8OV (C)
l tl2V Ser i es
.
+12V (D)
Regulator
(A) +120VV 3
(B)-60V3
(C)+80VV 3
(D)
+12VV 3
(E)
+12VV 3
(F)
+12VV 3
(G)
+6V 3
(H)
+5V 3
(I) -lov3
(J)-5V
3
(K) +18VV 3
(L)
+24V 3
Gr oundl
r
F
+12V Series
,,
Regulator
* +12v (E)
+12V Series _
.
+12v (F)
-
Regulator
Low Voltage
1 .
_* +6V (G)
0
Chopper Circuit _
- t5V Series + +5V (H)
1
1
1 Regu I ator
0
+18V Series
Regulator
* +18V (K)
I
I
I
I
+ +24V (L)
(Fig l-l) BLOCK DIAGRAM of the 4FGe’s Power Supply
BRIGHTNESS AND CUT-OFF CONTROL
SUB-BIAS CONTROL
VIDEO OUTPUT AMPLIFIER
D/A STARTUP CIRCUITS AND BRIGHTNESS/CONTRAST CONTROL D/A and OP-AMP IC
SUPPLY VOLTAGE
HORIZONTAL OSCILLATION UNIT and POWER INDICATOR LED’s
VIDEO BOARD OP-AMP SUPPLY, VIDEO PRE-AMPLIFIER SUPPLY, and VERTICAL
DEFLECTION OUTPUT SUPPLY
CRT HEATER, and LOW +B PROTECTOR VOLTAGE
CPU, E’PROM, and MULTIPLIER. D/A IC SUPPLY VOLTAGE
DISTORTION ADJUST UNIT.
ANALOG MASTER OP-AMP and D/A OP-AMP OUTPUT SUPPLY VOLTAGE
DISTORTION ADJUST UNIT, and ANALOG MASTER SUPPLY VOLTAGE, and H OSC UNIT
VERTICAL DEFLECTION SUPPLY, HORIZONTAL OSCILLATION UNIT HIGH VOLTAGE
PROTECTOR UNIT, DISTORTION ADJUST UNIT and ANALOG MASTER SUPPLY VOLTAGE
35

NEC MultiSync 4FGe Specifications

General

Brand	NEC
Model	MultiSync 4FGe
Category	Monitor
Language	English