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The +22-volt supply is rectified by 6306 and the negative 22-volt supply is rectified by 6307. The voltage
on Pin 18 of 5300 is monitored to detect a failure of the AC supply to the set. This circuit signals the
Microprocessor in the event that AC is removed from the set while it is turned On. The voltage from
Pin 18 is rectified by 6318 and is applied to the Shunt Regulator 7305. Shunt Regulator 7305 is turned
On, keeping the Power Fail and Protect lines Low. When AC is removed while the set is On, 7305 will
turn Off fast. This is because the filter capacitor for the input to 7305 is small. When 7305 turns Off,
the Power Fail line goes High from the voltage on the +22-volt line. The Microprocessor will shut the
set down while it still has voltage to operate.
Video Signal Flow
Figure 7
The HDR2002 is able to accept inputs from NTSC sources, Progressive Scan inputs, and 1080I inputs.
Composite Video or YC from the Side Jack panel is fed to the Video switch located on the SSM
(Small Signal Module). The SSM Video switch selects between the Composite inputs or SVHS inputs
of the Side Jack panel for the inputs located on the SSM. AV1 and AV2 inputs are located on the
SSM. AV3 is the Side Jack panel input. Selected Composite video or YC is fed to the SSB (Small
Signal Board) that plugs into the SSM. NTSC component video Y Pb Pr is buffered and fed to the
SSB. Selected Composite Video is fed to the PIP panel for the PIP window picture information. In the
Basic version, Composite video from the SSB is also fed to the PIP panel. In the Basic version, the
PIP panel does not have a Tuner. The PIP panel does have a Tuner in the Basic + and Core version.
The main Tuner is located on the SSM. IF from this Tuner is fed to the SSB. Composite video from
the SSB, which is developed from the main Tuner, is fed to the PIP panel. Switching on the PIP panel
selects between video from the main Tuner or from the Tuner on the PIP panel in sets with two-tuner
PIPs. Selected Video is fed back to the SSB. YUV for the main picture from the SSB is fed to the PIP