Sony SSC-C104 Service Manual - Page 10

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SSC-C104/C108P

« X SUB

:Charge

discard

pulse

(Shutter speed control)

The sync signal pulse is made by IC303 based on the

CL pulse of IC302.

« SYNC

: Composite sync signal

* HD, VD

: Horizontal

and

vertical

drive signals

¢ BF

: Burst flag signal

* BLK

: Blanking pulse signal

* LALT

: Line alternate signal (PAL)

Because [C302 incorporates a level comparator, the

CCD-IRIS

can be realized by converting the iris

control signal from IC201 to a DC value by Q701,

Q702, and IC702 and inputting this signal to pin 39 of

1C302.

V driver (IC301 CXD1267)

The V register drive pulses (V1, V2, V3, V4) of the

CCD imager and the electric charge discard pulse (V

SUB) are driven by the drive IC (IC301) and output.

VCO/PLL/Line-Lock

(IC304

TC7S04F/IC601

TC508 1/IC602 TC74HC1 32)

This cameras sync system only has the Line Lock. The

V-PULSE extracted from the power line is compared

with the internal VD pulse compose the PLL. The VCO

is based on this PLL. This VCO output serves as the 28

MHz basic clock and supplied to the TG.

_ First, the V-PULSE from the power line is subjected to

waveform-shaping by IC602, and input to the PLL IC

(IC601) together with the internal VD. The control

signal which passed through the Low-Pass

Filter

(C602, C604, C605, R601, R602) is input to the LC

oscillation VCO circuit composed of IC304 and set as

the designated voltage (2.9V) by CT301.

Auto

Iris

(IC201

CXA1390/Q701/Q702/IC702

uPC358)

The control signal (pin 17 of IC201) extracted from the

front of the AGC amplifier controls the back light

correction circuit, DC servo lens, and VS servo lens.

In the DC servo lens, the control signal is passed

through the buffer Q701, mixed with the average value

and peak value, and output to the drive IC (IC702 1/2).

Level

adjustment

is performed

by changing the

reference voltage (pin 3 of IC701).

In the CCD-IRIS mode, the control signal is also used

as the reference voltage of the buffer amplifier (IC702

3-2

(7)

1/2) and controls the IC302 comparator input value,

regulate the shutter speed, and control the video signal

output level.

In the VS servo lens, the iris signal (video signal

without sync signal components) is passed through the

Q701 buffer and transmitted to the auto iris lens.

Chroma Matrix (IC403 CXA1391)

Inside the 1C403, CO (S2-S1) and YO (S1+8S2) are

separated from the S1 and S2 signals, matrixed to make

the RGB signal and delayed to make the V aperture

signal.

The RGB signal is made using the C1 signal delayed by

1H because the CO signal is the linear sequential signal

of the 2R-G signal and — (2B-G) signal.

The C1 signal is made by inputting the reverse polarity

output from pin 46 of EC403 to the 1H delay line ICSO1.

The signal is then passed through the Q501 buffer,

input to pin 48 of 1C403, passed through the gain

control amplifier, and input to the RGB matrix circuit.

In the gain control amplifier, the CO signal and Cl

signal are set to the same level by the voltage of pin 47

of IC103. The 1H delay line is a CCD delay element. It

is operated in a 2Fsc period by the XDL1 and XDL2

drive clocks.

The V aperture signal requires three lines of signals

actually, but in this case, only two lines of signals are

provided (simplified). The YO signal is delayed by 1H

to create the Y1 signal. The YO and Y1 signal are used

as the Y signal in the RGB matrix. The YO signal is

output with positive polarity from pin 52 of IC403, and

input to pin 3 of IC501. In this pin, it becomes a Y1

signal delayed by 1H, passed through the Q501 buffer

with negative polarity, and input to pin 55 of IC403. It

is then added to the YO signal in the gain control

amplifier, and input.to-the matrix circuit.

In the gain control amplifier, the YO and Y1 signals are

set to the same level by the voltage of pin 54 of IC403.

The RGB signals are made from these 2R-G, - (2B-G),

and Y signals.

White

Balance

(IC401

pPC324/IC402

NJU7022/

1C403 CXA1391)

The RGB signals each pass through the 2-stage gain

amplifier to produce the white components.

The

3200°K reference setting is simplified, and the R and B

control values (RV401, RV408)

are adjusted and

balanced by fixing the gain of pins 37 and 40 of IC403

so that the white components can be currently produced