36
10. Communications
Communications (HA-3 & RA-5A Chassis)
There are three communications buses in the HA-3 Direct view chassis (Figure 10-2) and similar RA-5A pro-
jection TV chassis (Figure 10-3):
•
RXD/TXD bus between the Q box and the Main Micro (B board).
•
S data and clock bus between the Main Micro and its TV operation ICs.
•
B data and clock bus between the Main Micro and its memory ICs (NVM).
See Figure 10-1 below.
Q Box
Microprocessors
B Board
Main
Micro
IC001
TXD
RXD
B data/clk
S data/clk
NVM
HA-3 - D Bd.
RA-5A - A Bd.
TV Operating ICs
HA-3 - A & D Bb.
RA-5A - A Bd.
Figure 10-1
In comparing the two chassis, the only communication differences between them are the final destinations of
the two buses on the A and D boards.
10
IC004
NVM
IC001
MAIN
MICRO
IC8902
MID MICRO
IC7205
DIG
PROCESS
CN002
11
11
B
1
A
1
2
2
11
B
1
A
1
13
1
(RST)
(T)
STBY
5V
CN007
N/C S DATA, CLK
(R)
A10 = DATA
A11 = CLOCK
CN8801
CN8601
Q BOX
B CLK,
DATA
B BD.
14
1
15
CN005
CN004
A20
2
B19
1
1
2 1
A
1
B
1
A
11
B
11
CN4402 (AUDIO)
TUNERS
CN3171
7 8
2 1
CN6506
CN3173
CN5501
CONV.
D FOCUS
D BD.
A BD.
CN2003
FIGURE 10-2 - HA-3 CHASSIS COMMUNICATION
52TVP12 1364
9/7/01
CLOCK &
DATA =
4Vp-p,
PRESENT
WHEN TV
IS ON
A25
B25
7 8
IC5001
NVM
S COMMUNICATIONS
DATA CLK
CN005 A10 A11
CN007 1 13
CN4402 15 14
CN6506 2 1
CN5501 8 7
CN2003 A20 B19
B COMMUNICATIONS
DATA CLK
CN2003 A2 B1
B
2
A
11
B
11
=
=
=
CONN.
DESC.
PATH
A
2
=
MID
BUSY
BOX RST
M16 RXD
M16 TXD
Summary of Contents for KD-34XBR2 - 34" Hdtv Fd Trinitron Wega
Page 77: ...74 RA 5A Chassis Board Layout ...
Page 108: ...APPENDIX ...
