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DP-4X MICROPROCESSOR DATA COMMUNICATIONS CIRCUIT EXPLANATION
ON THE SIGNAL PWB:
UD2003 Digital Tuner (ATSC Tuner) Not in the DP-43 Chassis.
The Microprocessor I004 controls the Digital Tuner via communication lines. They are listed below;
•
DM RTS (Digital Module Receive Transmission) from pin (21) of PMS1 connector to pin (27) of I004.
•
DM CTS (Digital Module Serial Clock) this bi-directional signal is connected via pin (20) of I004 and
pin (22) of the PMS1 connector.
•
DM TXD (Digital Module Transmission Data) this bi-directional signal is connected via pin (4) of I004
and pin (24) of the PMS1 connector.
•
DM RXD (Digital Module Receive Data) this bi-directional signal is connected via pin (3) of I004 to
pin (23) of the PMS1 connector.
I007 EEPROM
The EEPROM is ROM for many different functions of the Microprocessor I004. Channel Scan or Memory List,
Customer set ups for Video, Audio, Surround etc... Also, some of the Microprocessors internal sub routines have
variables that are stored in the EEPROM, such as the window for Closed Caption detection. Communication is
Data and Clock lines, SDA3 from pin (40) of the Microprocessor to pin (5) of the EEPROM and SCL3 from pin
(39) of the Microprocessor to pin (6) of the EEPROM. Data travels in both directions on the Data line.
Note: In this chassis, if the EEPROM is removed or defective, the Microprocessor will LOCK the picture. No
functions other that the front Power Button will work. LOCK will appear on the screen, but the customer's menu
can not be accessed.
I011 EEPROM
The EEPROM is ROM for the IR Blaster I012. The Customer's Menu allows control of external equipment via
remote control interaction with the Customer's Menu. The External device remote codes are stored in the
EEPROM. When the Customer's Remote for the TV activates the on screen selections in the Customer's Menu,
these control codes are translated in the IR Blaster chip to the appropriate code for the external device. Commu-
nication is Data and Clock lines, SDA3 from pin (40) of the Microprocessor to pin (5) of the EEPROM and
SCL3 from pin (39) of the Microprocessor to pin (6) of the EEPROM.
UY01 Flex Converter FC04
The projection television is capable of receiving NTSC as well as ATSC (SDTV) and HD (High Definition). The
Flex Converter is responsible for receiving any video input and converting it to 33.75 Khz output (2.14H). This
output is controlled by sync and by the customer's screen format and how it is set up. The set up can be 4X3 with
grey side panels, Smooth Wide, Fill or Full and even 4X3 with Black Side panels. 16X9 for SDTV. This set will
automatically bypasses the Flex Converter completely and inputs the 1080i signal directly to the Rainforest IC
IY04. This happens when a true 1080i signal or Antenna C is selected. The Flex Converter can take any NTSC,
S-In, Component, NTSC or any of the 18 formats of ATSC except 1080i which doesn't route through the Flex
converter. Control for the Flex Converter is Clock, Data and Enable lines. The Clock, Data and Enable lines
must be routed through the Level Shift IC I009 to be brought up to 5V which the Flex needs.
•
The Clock line for the Flex Converter is output from the Microprocessor at pin (53 Clock). Clock is input to
I009 at pins (3 Clock) and is output at pins (17) then through the PFC1 connector pin 10
•
The Data line for the Flex Converter is output from the Microprocessor at pin (52 Data). Data is input to
I009 at pins (4 Data) and is output at pins (16) then through the PFC1 connector pin 11
•
The Enable line for the Flex Converter is output from the Microprocessor at pin (54 FCENABLE). Enable is
input to I009 at pins (2 Enable) and is output at pins (18) then through the PFC1 connector pin (12).
Data from the Flex Converter is also sent back to the Microprocessor. Data from the Flex is sent out of the PFC1
connector pin (11) to pin (5) of I007, level shifted down to 3.3V and output at pin (15) into pin (51) of the Micro-
processor I004.
(Continued on page 3)
PAGE 02-02
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