Hitachi 46W500 Training page 74

DP-3X DIGITAL CONVERGENCE INTERFACE CIRCUIT EXPLANATION
MICROPROCESSOR:
The Microprocessor is only involved in the Digital Convergence circuit related to disabling IR (Infrared Remote
Control Signals). When the DCU is put into the Digital Convergence Adjustment Mode (DCAM) or Magic Fo-
cus, the Microprocessor ignores IR pulses. This is accomplished by the BUSY signal from the DCU. The BUSY
signal is routed from the DCU out the PDG connector pin 19, to the PDD1 connector pin 2, then the PPS1 con-
nector pin 2 to the Microprocessor I001 pin 42 telling the Microprocessor that the DCU is busy.
RAINFOREST IC (Video Processor).
The Rainforest I501 is only involved with the Digital Convergence circuit related to OSD and Velocity Modula-
tion inhibit during Digital convergence OSD operation in which it inhibits the Luminance from the main video.
This is accomplished by DCU YS from pin 19 of the PDG connector to QK09 to PPD1 PPS1 pin 2 to Q518 to
pin 2 of I501.
SERVICE ONLY SWITCH:
The Service Only Switch is located just in front of the DCU on the Deflection PWB. If the front speaker grills are
removed and the front access panel is opened, the switch will be on the far left hand side. When this button is
pressed with the TV ON, the DCU enters the Digital Convergence Adjustment Mode.
If the button is pressed and held down with the TV OFF and the power button is pressed, the Digital Conver-
gence RAM is cleared. This turns off any influence from the DCU related to beam deflection. Magnetic centering
is performed in the mode as well as the ability to enter the 3X3, (9 adjustment points) mode.
NOTE: The Digital Convergence Adjustment Mode DCAM can be entered by the Remote Control. Magic
Focus must be able to run. Press Magic Focus button on front panel, while its running, press the Magic Fo-
cus button in and hold. Stop will be displayed. Press the INFO button on the remote while STOP is dis-
played.
MAGIC FOCUS SWITCH:
•
Located on the Front Control panel is the Magic Focus switch. When Magic Focus is activated by the cus-
tomer pressing this switch, the DCU enters the "MAGIC FOCUS" adjustment mode described earlier.
•
When the Customer presses the Magic Focus Switch, the low is sent to the Microprocessor I001 pin 45. The
Microprocessor pin 44 then communicates with I010 pin 8 (Level Shift) and it outputs a low on pin 12
(Magic Sw). This low is routed through the PPS1, PPD1 connector pin 5 to the DCU connector PDS pin 1.
This starts the Magic Focus function.
•
Also the Magic Focus can be started from the Customer's Menu by this same process.
CONVERGENCE MUTE:
IK02 is the convergence mute IC. When the +28V line collapses when power is turned off, it's possible that the
output STKs could be damaged. To prevent this, IK02 monitors the +28V line. If it falls too low, pin 3 will out-
put a Mute signal to pin 21 of connector PDS on the Digital Convergence Unit.
CUSTOMER'S MANUAL DIGITAL CONVERGENCE ADJUST:
This year, the Digital convergence can be adjusted by the customer.
This is accessed from the Video Menu and selecting Magic Focus. Un-
der the Magic Focus menu, select Manual. (See Figure). They have ac-
cess to the 117 adjustment points for Red and Blue. (Green is fixed as
reference). However, if after adjusting using this process, the customer
can no longer use Magic Focus. To regain Magic Focus operation, re-
turn to the Customer's Menu-Video-Magic Focus and select AUTO.
Magic Focus will become functional however, manual adjustment data
is lost.
Video
Magic Focus
Aligns the Red, Green, and Blue
colors to correct for Magnet
Influences.
Adjustment Mode
Auto
Manual
If you want to adjust now
Move Sel Select
PAGE 06-04
START