6-2
CIRCUIT DESCRIPTION
In addition, IC6606 is in charge of controlling the ROM (IC6607, IC6608, IC6610, IC6611, IC6617, IC6618) for
digital video signal processing control and the ROM control ICs (IC6612, IC6616, IC6619, IC6620). This pro-
cessing is controlled by SROMRST from the microcomputer.
The on-screen signal is generated at IC6609, which is controlled by OSDCS, VICLK, VIDATA from the micro-
computer and by OSDCK, VDOSD, HDOSDD) from the timing controller block.
2. Sync signal processing
(1) Sync signal processor block
The separate SYNC of the PC signal from the “PC” connector and the video signal from the “VD” connector are
respectively entered in IC6102. In IC6102, the sync signal is selected with HVSEL0 and HVSEL1 from the
microcomputer. Since then, this signal input is entered in the sync signal processor IC6104.
The Y signal of the component signal from the “HD” connector and the G on Sync signal of the PC signal from
the “PC” connector are respectively entered in IC6103 after passing through the buffer. In IC6103, the sync
signal is selected with YGSEL0 and YGSEL1 from the microcomputer. Since then, this signal input is entered
in the sync signal processor IC6104 for the purpose of sync separation signal processing.
IC6104 automatically makes judgment of whether sync separation signal processing is needed or not. The
resultant output is sent to the circuit (IC6506, microcomputer, IC6105) at the next stage, after the unification of
sync signal polarity.
IC6104 sends out outputs to the microcomputer, regarding the presence of sync signal or the result of polarity
judgment.
Sync positive or Sync negative or G On Sync
Positive output
Pins
#
&
$
Negative output
Pin
%
(2) AFC (auto-frequency control) circuit block
An AFC circuit is loaded on IC6105. Therefore, AFC is effective on sync signals being output from IC6104. The
oscillation frequency is controlled by SDA and SCL from the microcomputer. A sync signal is selected from the
AFC circuit so that a stable sync signal can be obtained even under the condition of no signal. IC6106 is a
basic pulse generator for AFC, requiring the adjustment of VR6103 and VR6104.
(3) Clock generator block and timing controller block
IC6507 is the fundamental clock generator of this system. IC6506 is a timing controller that generates various
horizontal and vertical signals, based on the clock signal generated at IC6507.
IC6507 generates the fundamental clock signal by controlling the VCO (voltage control type oscillator) through
phase comparison between HSYNC input from IC6104 to IC6506 and the horizontal sync signal (INTHD)
obtained by fundamental clock signal division at IC6506. This series of operation stabilizes the fundamental
clock.
The clock oscillation frequency is changeable with the input signal. It is about 25MHz when the VGA signal is
displayed in the PC mode.
IC6506 is controlled by VICLK, VIDATA, and TIMLAT from the microcomputer, and various horizontal and
IC6107
4
pin (Hsync)
IC6107
5
pin (INTHD)
Summary of Contents for PlasmaSync PX-42M2A
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Page 135: ...METHOD OF DISASSEMBLY 7 1 1 Diagonal view of the unit front ...
Page 136: ...2 Diagonal view of the unit rear 7 2 METHOD OF DISASSEMBLY ...
Page 148: ...MEMO ...
Page 152: ...MEMO ...
Page 155: ...B SAFETY BRACKET SASSY C CAP SASSY D SERVICE BAG SASSY PACKAGING 10 2 ...
Page 157: ...PACKAGING 10 4 G CUSHION CARTON BOX ...
Page 159: ...Outer box PACKAGING 10 6 ...
Page 162: ...2 PX42M2G ...
Page 163: ...12 1 CONNECTION DIAGRAMS ...
Page 164: ...13 1 BLOCK DIAGRAMS I O ANALOG ...
Page 165: ...13 2 BLOCK DIAGRAMS VIDEO AUDIO ...
Page 166: ...13 3 BLOCK DIAGRAMS POWER UNIT ...
Page 168: ...I O PWB PWC 4213B PARTS SIDE SOLDER SIDE SCHEMATIC DIAGRAMS 14 2 ...
Page 179: ...ANALOG PWB PWC 4214 PARTS SIDE SCHEMATIC DIAGRAMS 14 13 ...
Page 180: ...ANALOG PWB PWC 4214 SOLDER SIDE SCHEMATIC DIAGRAMS 14 14 ...
Page 184: ...VIDEO PWB PWC 4213A PART SIDE SCHEMATIC DIAGRAMS 14 18 ...
Page 185: ...VIDEO PWB PWC 4213A SOLDER SIDE SCHEMATIC DIAGRAMS 14 19 ...
Page 187: ...AUDIO PWB PWC 4216A PARTS SIDE SCHEMATIC DIAGRAMS 14 21 ...
Page 188: ...AUDIO PWB PWC 4216A SOLDER SIDE SCHEMATIC DIAGRAMS 14 22 ...
Page 190: ...SOUND I O PWB PWC 4216B PART SIDE SOLDER SIDE SCHEMATIC DIAGRAMS 14 24 ...
Page 196: ...MEMO ...
Page 197: ...PRINTED IN JAPAN 9806MI1250 01272002 PX 42M2A 01272003 PX 42M2G ...