Deflection Circuit; Horizontal Deflection Unit - NEC MultiSync 3D JC-1404HME Service Manual

(2-1-6) -12V and -30V lines (i and
j)
The -30V is produced by rectifing the tlyback pulse. The -12V is produced by the reverse biasing of
the zener diode.
F.B.T
-u-GND
(2-2) Deflection Circuit
(2-2-1) HORIZONTAL DEFLECTION UNIT
(a) Horizontal drive circuit
j)-30V
i}-12V
ZD506
RD8.2EB(2)
ZD507
RD3.9EB(2)
(SAWTOOTH GENERATOR)
C407
220µ
HAl 1423
+24V
Hih
L ~
15 18 40
fH (kHz)
0539
2SC1473
R584
2.2K
1/2W
C547
I
560P
500V
R586
560
3W
0538
2SA
1018
H.OUT
C548
T
0.039
rfr
400V
R587
680
3W
' - - - - - - - - - - + 8 5 V
R5E4
6.8K
The horizontal pre-drive pulse produce at IC401 pin 15 is applied to 0522. Then, it is amplified
by T502 to turn on the horizontal output transistor 0523.
NOTE: When the horizontal frequency is less than 28 kHz, the power is supplied to T502 via
R586 from the +85V line. And, when horizontal frequency is ~ore than 28 kHz, the
power is supplied via R586 and R587 from the +85V line.
-53-
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