Vertical Deflection; Horizontal Deflection - NEC N9902-1 Service Manual

Mode State
User ON Pulses
Stand By No pulses
Suspend Pulses
PMS_OFF No pulses No pulses
Factory ON Pulses
Stand By No pulses
Suspend Pulses
PMS_OFF No pulses No pulses
Mode State
User ON
Stand By No pulses
Suspend
PMS_OFF No pulses No pulses
Factory ON
Stand By No pulses
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.
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Input
Sync
H V H
Pulses Pulse
Pulses L
No pulses L
L
Pulses Pulses Pulses
Pulses L
No pulses L
L
Input
Sync
H V H
Pulses Pulses Pulse
Pulses L
Pulses No pulses L
L
Pulses Pulses Pulses Pulses
Pulses L
Pulses No pulses L
L
28
Output
Sync Mute PS
V 1 2
Pulse L H H
L H L H
L H L H
L H L L
L H H
L L H H
L L H H
L L H H
Output
Sync Rotation
V DAC
Pulse Adj. data
L 107/255
L 107/255
L 0/255
Adj. data
L Adj. data
L Adj. data
L Adj. data
CS
1 2 3 4
Depend on fH
L L L L
L L L L
L L L L
Depend on fH
L L L L
L L L L
L L L L
SW
1 2 3
Depend on fH
H H H
H H H
H H H
Depend on fH
H H H
H H H
H H H