NEC MultiSync V920 User Manual

Input Output
Sync Sync PS CS
Mode State
HVHV
Mute
121234
ON Pulses Pulses Pulse Pulse L H H Depend on fH
Stand B
y
No pulsesPulses L L H LHLLLL
Suspend PulsesNo pulses L L H LHLLLL
User
PMS_OFFNo pulsesNo pulses L L H LLLLLL
ON Pulses Pulses Pulses Pulses L H H Depend on fH
Stand B
y
No pulsesPulses L L L HHLLLL
Suspend PulsesNo pulses L L L HHLLLL
Factor
y
PMS_OFFNo pulsesNo pulses L L L HHLLLL
Input Output
Sync Sync Rotation SW
Mode State
HVHVDAC123
ON Pulses Pulses Pulse Pulse Ad
j
. data Depend on fH
Stand B
y
No pulses Pulses L L 107/255 H H H
Suspend Pulses No pulses L L 107/255 H H H
User
PMS_OFF No pulses No pulses L L 0/255 H H H
ON Pulses Pulses Pulses Pulses Ad
j
. data Depend on fH
Stand B
y
No pulses Pulses L L Ad
j
. data H H H
Suspend Pulses No pulses L L Ad
j
. data H H H
Factor
y
PMS_OFF No pulses No pulses L L Ad
j
. data H H H
(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.
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NEC MultiSync V920 Specifications

General

Brand	NEC
Model	MultiSync V920
Category	Monitor
Language	English