Genius 1493, ISO XFR-75W, 2093, 2793, 3693, 1793, 1993 Monitor, Block Diagram Review, Fault, Detector

Monitor, Block Diagram Review.

G2≈ 290V

2 For Dual Focus

On Video Board.

GAME

G1≈ –20V

VIDEO

3

VIDEO

3

VIDEO

3

Beam

3

Interface

AMPS.

Current

CRT

RGB

Bias

Feedback

A

B

SYNC

3

C

VDY

H

BLANKING

3

Auto

V. & H.

F.B.P.

Bright

HDY

EHT≈ 25KV

V retrace

G

3

Beam limit

3

M. gain

D

High temp. limit

CRT AUTO

Beam current

I

BIAS IC

buffer

H. sync (FBP)

Program pulse

Dynamic Focus

SYNC

VERTICAL

V. sync

Grid pulse

used only on Dual

Interface

SYNC

CA3224E

Focus CRTs

E

J

DELAY

2

F

Horizontal

Dynamic

VERTICAL

Focus

Vs

VERTICAL

CONTROL &

H2

OSCILLATOR

OUTPUT

LA7851

LA7838

K

I. V. Feedback

L

V+

Vertical

+

Dynamic

G2

EHT

Focus

	LA7851			H1
	HORIZONTAL	H.	H.	FBT
Hs	CONTROL	Driver	Output	2
	Sync delay	N	O	P
	M
H. Pos.
		PINCUSHION
	V. Size &
	V. Ras. Pos.

REMOTE

HORIZONTAL

DIODE

CONTROLS

Size Control

Modulator

(PCB)

Q

R

S

Beam Current

+52V to +129V

ISOLATION

VOLTAGE

LOAD (VIDEO & DEFLECTION)

Transformer

DOUBLER

V

(IN GAME)

Raw DC

320V

+16V

+12V

+12V

T

SWITCHING

Regulator

V-

-200V

REGULATOR

+24-27V

W

Shutdown Sync

U

Vertical Deflection

Supply

DEGAUSSING

FAULT

OVER

+24V

VOLTAGE

FBP

CIRCUIT

DETECTOR

PROTECT

Z

Y

X

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