Menu Mode

7)Setting the clamp position

Plugging in RGB (G ON SYNC) signals and a sync signal simultaneously may produce inappropriate intensity reproduction, with an over-bright screen or images with a greenish cast. If this occurs, set “CLAMP : MODE 2”. For most situations, leave “CLAMP : MODE 1”.

Clamp pulse (a timing pulse necessary for intensity reproduction), is generated in two ways, “a” and “b”, as shown in Figure 1.

Figure 1: Generation of a clamp pulse

a. Generating a clamp pulse from separate sync

Clamp effective area

G (Green)

H(Separate Sync Signal)

Clamp pulse

b. Generating a clamp pulse from G ON SYNC

Clamp effective area

G (G ON SYNC)

Figure 2: When a sync signal is supplied simultaneously with G ON SYNC

Clamp effective area

G (G ON SYNC)

H (Separate sync signal)

Clamp pulse (In

CLAMP:MODE 1)

Clamp pulse (In

 

 

Correct clamp timing

 

 

CLAMP:MODE 2)

 

 

 

Clamp pulse

Sync signals are monitored in “CLAMP : MODE 1”, and the unit is automatically switched to generate a clamp pulse by method “a“ shown in Figure 1 in the presence of sync signal, and by method “b“ in the absence of a sync signal. But when a sync signal is fed simultaneously with G ON SYNC, the unit perceives a sync signal, and generates a clamp pulse as shown in “a“ in Figure 1. The generated clamp pulse is mis-timed, making correct reproduction of intensity impossible.

In this case, unplug the sync signal or set “CLAMP : MODE 2“.

In “CLAMP MODE 2“, the clamp pulse is generated by pulse“b“in Figure 1, whether or not a sync signal is present, ensuring correct reproduction of intensity.

(NOTE) The figures above are for illustrative purposes only.

(NOTE) Please regard the case of composite sync input as being the same as the case of separate sync input.

Set-able condition:

RGB signal received via INPUT 3 or 4.

Factory preset: INPUT 3 : MODE 1

INPUT 4 : MODE 1

1Select SETUP.

Screen 1

MAIN MENU

CONTRAST : 0

PICTURE

SCREEN

BRIGHT

: 0

ALL RESET

COLOR

: 0

POWER SAVE

TINT

: 0

3SET UP

SHARP

: 0

 

RESET

 

MENU : MENU OFF

5∞ 3 : SELECT SET : NEXT

2Move the cursor to CLAMP, and use the SET button to change the setting.

Pressing the SET button toggles clamp mode between MODE 1 and MODE 2.

Screen 2

SET UP

 

 

TERMINAL

: D-SUB

SETTING

: PC

SIGNAL

: RGB

3CLAMP

: MODE 1

ABL

: OFF

H. ENHANCE :

0

V. ENHANCE :

0

EXIT

5∞ 3 : SELECT SET : CHANGE

(NOTE) No setting possible during input of component image signals

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Pioneer 502MX technical manual Setting the clamp position, Input 4 Mode