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Vertical Deflection; Horizontal Deflection - NEC MultiSync V920 Service Manual

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Mode
State
User
ON
Stand By
Suspend
PMS_OFF No pulses No pulses
Factory
ON
Stand By
Suspend
PMS_OFF No pulses No pulses
Mode
State
User
ON
Stand By
Suspend
PMS_OFF No pulses No pulses
Factory
ON
Stand By
Suspend
PMS_OFF No pulses No pulses
(b)The U702 is an EEPROM IC which stores the parameters of each mode and the user adjusting result
and also DDC data. It is controlled by IIC bus from MCU.
4.

Vertical Deflection

(a)Vertical deflection Saw-tooth waveform is provided by U301, pin 23, and amplified by U401
TDA8172.
(b)A voltage multiplier connected to pin 3 and pin 6, consists of D402, C409 to avoid flyback scanning
line appeared during the vertical flyback period.
(c)U301 (TDA9111) pin 21 provides a DC level as a V-Position control voltage.
(d)U401 pin 5 is output to drive vertical yoke.
5.

Horizontal Deflection

(a)U301 is a horizontal signal processing IC. Horizontal Driver signal is output from pin 26 of U301
TDA9111 and through Q333, Q334 to drive Q316 and T301.
(b)T301 is an on/off type driver transformer. It functions to convert primary energy to secondary, and
drive the horizontal output transistor Q315, R369 and C363 are the snubber.
Input
Sync
H
V
Pulses
Pulses
No pulses
Pulses
Pulses
No pulses
Pulses
Pulses
No pulses
Pulses
Pulses
No pulses
Input
Sync
H
V
Pulses
Pulses
No pulses
Pulses
Pulses
No pulses
Pulses
Pulses
No pulses
Pulses
Pulses
No pulses
Sync
Mute
H
V
Pulse
Pulse
L
L
L
H
L
L
H
L
L
H
Pulses Pulses
L
L
L
L
L
L
L
L
L
L
Sync
Rotation
H
V
Pulse
Pulse
Adj. data
L
L
107/255
L
L
107/255
L
L
Pulses Pulses
Adj. data
L
L
Adj. data
L
L
Adj. data
L
L
Adj. data
28
Output
PS
1
2
1
2
H
H
Depend on fH
L
H
L
L
L
H
L
L
L
L
L
L
H
H
Depend on fH
H
H
L
L
H
H
L
L
H
H
L
L
Output
SW
DAC
1
2
Depend on fH
H
H
H
H
0/255
H
H
Depend on fH
H
H
H
H
H
H
CS
3
4
L
L
L
L
L
L
L
L
L
L
L
L
3
H
H
H
H
H
H

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