Sony STR-DE845, Руководство по обучению

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14
4. Control Signal Block
Control Signal Block
Input/Output Select ICs Control Signal Block
IC303
ANALOG
INPUT
SELECT
12
IC301
ANALOG
INPUT
SELECT
15 16
3 5 4
15 14 16
IC1005
DIGITAL
INPUT
SELECT
2 14
7
17
TO
IC304/
PINS 3
& 5
19 17 18
47 48 46
93 92
2 CH. MODE
FROM IC304
CLK
CE
SDI
L R
SDI
14
CLK
CE
SDI CLK
CE
A B
R1007
R1006
ANALOG
INPUTS
REAR
PANEL
JACKS
12 17
L
R
TO
IC1101/
PIN 3
ANALOG INPUTS
REAR PANEL
JACKS
SDI
CLK CE
R1282
R1281
EXTERNAL
5.1 CH.
J307
5.1 CH.
INPUT
FROM
IC1503
TO IC304/
PINS 3 & 5
CNP301
CNS306
CNS5
A B
DIGITAL
INPUTS
FROM
X1201
16MHz
IC1201
SYSTEM CONTROL
107
108
FIGURE 4-1
DIGITAL BOARD
INPUT/OUTPUT
SELECTOR ICs
CONTROL BLOCK
1A124 1365
11/20/01
IC1001
IC1002
IC1003
J1001
OPTICAL
COAXIAL
IC1502
OUTPUT
SELECT
15 14 16
19 AC 18
IC1005 CONTROL LINES
PIN No.
(OPTICAL) DVD/LD
(OPTICAL)TV/SAT
(OPTICAL)DAT/MD
(COAX) DVD/LD
A
2
B
14
0
1 0
0 1
1 1
0
TABLE 4-1
DIGITAL BOARD
MAIN BOARD
AU SW BOARD
2 1 3
CNP11
DIGITAL BOARD
Circuit description
NOTE: Reference Figure 4-1 for the following circuit description:
Data, Clock and Chip Enable Lines
All control signals are supplied by IC1201 (System Control). IC1201/Pins 108 and 107 control the digital input
selection of IC1005 (pins 2 and 14). These control lines are a simple two-bit input. Table 4-1 shows the two-bit
code for the corresponding input. The resistors on the output of IC1201 (R1282 and R1281) and on the input of
IC1005 (R1006 and R1007) are easy probe points to confirm the bit pairs in the table.
The control lines for IC301, IC303 (analog input select ICs) and IC1502 (output select IC) are at IC1201/pins 46
(CE), 47 (Data) and 48 (CLK). These control signals are somewhat difficult to view due the fact that they are only
present while switching between inputs via the front panel buttons of the receiver. However, the main concern
here is that there is communications between ICs and that the actual inputs do change. Waveforms 4-1, 4-2 and
4-3 illustrate how the waveforms will appear on the oscilloscope while switching between inputs (e.g. Video 1,
Video2, DVD/LD etc). Once again, these are not exact waveforms. Confirmation of data communications
between ICs and data amplitude (5Vpp) are the important factors. All three pins (IC1201/46, 47 and 48) are at a
low state (0V) while waiting for a button to be pressed (standby state).