Setting The Clamp Position - Pioneer PDP-501MX Technical Manual

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 to MODE 2. For
most situations, leave CLAMP to 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
G (Green)
H (Sync signal)
Clamp pulse
b. Generating a clamp pulse from G ON
SYNC
G (G ON SYNC)
Clamp pulse
Figure 2 When a sync signal is supplied simultaneously with G ON SYNC
G (G ON SYNC)
H (Sync signal)
Clamp pulse
(In CLAMP MODE 1)
Clamp pulse
(In CLAMP MODE 2)
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 mistimed, making correct reproduction of intensity
impossible. In this case, unplug the sync signal or set CLAMP to MODE 2.
In CLAMP MODE 2, the clamp pulse is generated by method "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.
Clamp effective area
Clamp effective area
Clamp effective area
Clamp out of timing
Correct clamp timing
Menu Mode
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