Pioneer PDP-501MX - Manual (Page 79)

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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
Figure 2 When a sync signal is supplied simultaneously with G ON SYNC
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.
Menu Mode
a. Generating a clamp pulse from separate
sync
Clamp effective area
G (Green)
H (Sync signal)
Clamp pulse
b. Generating a clamp pulse from G ON
SYNC
Clamp effective area
G (G ON SYNC)
Clamp pulse
Clamp effective area
G (G ON SYNC)
H (Sync signal)
Clamp pulse Clamp out of timing
(In CLAMP MODE 1)
Clamp pulse Correct clamp timing
(In CLAMP MODE 2)