Caple C702G Manual de servicio descargar pdf (Pagina 131)

8-6

5) On Screen Manager (OSM)

The OSM circuit consists of IC791 (OSM controller) and IC711 (Pre-amp) which matrix the video signal and

the OSM signal. IC791 receives the display data from IC801 (CPU), and the signal outputs R, G, B and

Blanking are fed out of pins 13, 15, 17 and 12 respectively. The OSM signals are mixed with video signals in

IC711 (Pre-amp). The OSM screen brightness is controlled by I

C BUS from CPU.

(Fig 1.5) On Screen Manager

6) Self Test

There are two ways to activate the self test function,.

User mode: power on the monitor while holding down the RESET switch

Factory mode: no H/C sync and SOG of selected input mode

When the self test mode is activated, IC801(CPU) controls IC501 to oscillate at approx.61.6KHz. Thus the

horizontal deflection circuit and the high voltage circuit operate at this frequency. When Q797 is turned off by

S_BIAS signal from IC801(CPU). The pseudo vertical sync signal count down from the horizontal sync signal

with IC8M1 is effective, and the shape AFC pulse are fed to IC791 and IC7A1, the clamp pulse for IC711 is

generated by IC7A1. The video signal is generated by IC791, and fed to IC721(Output amp) via IC711(PRE-AMP).

IC711

M52742ASP

PRE-AMP

IC791

M35070-050FP

OSM CONTROLLER

IC801

CPU

13 9 4 1

15 13 17 12

BLK

H.S

(

AFC

)

V.S

(

)

IC791

M35070-050FP

OSM

IC801

CPU

IC501

HE6-0092

DSP(OSC IC)

IC711

M52742ASP

PRE-AMP

IC8M1

BU6483K

AUTO SIZE

IC721

VPS16

OUTPUT-AMP

IC7A1

M52347FP

I/F

DEFLECTION

CIRCUIT

V(PUMP)

FC(TTL)

CLAMP

PULSE

R/G/B

R/G/B/BLK

VD_SELF

CBUS

S_BIAS

(Fig1.6) Self Test

1 2 ... 126 127 128 129 130 131 132 133 134 135 136 ... 285 286

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