Read Sony MDX-C7890R Service Manual online
– 49 –
•
MAIN BOARD IC700 (MASTER CONTROLLER)
Pin No.
Pin Name
I/O
Function
1 to 7
NC
O
Not used (open)
8
VCC
—
Power supply terminal (+5V)
9
PLL SI
I
PLL serial data input from the FM/AM PLL (IC100)
10
PLL SO
O
PLL serial data output to the FM/AM PLL (IC100)
11
PLL CKO
O
PLL serial data transfer clock signal output to the FM/AM PLL (IC100)
12
NOSE SW
I
Detects the removal of the attaching and removing type front panel block “L”: attaching
13
LCD SO
O
Serial data output to the liquid crystal display driver (IC801)
14
LCD CKO
O
Serial data transfer clock signal output to the liquid crystal display driver (IC801)
15
BEEP
O
Beep sound drive signal output terminal
16
DBMOD2
O
D-BASS mode control signal output to the SM5852ES (IC201)
17 to 19
NC
O
Not used (open)
20
UNI SI
I
Serial data input from the SONY bus interface (IC600)
21
UNI SO
O
Serial data output to the SONY bus interface (IC600)
22
UNI CKO
O
Serial data transfer clock signal output to the MD mechanism controller (IC501) and SONY bus
interface (IC600)
interface (IC600)
23 to 25
NC
O
Not used (open)
26
VOL SO
O
Serial data output to the electrical volume (IC300)
27
VOL CKO
O
Serial data transfer clock signal output to the electrical volume (IC300)
28
DSTSEL0
I
Destination setting terminal (fixed at “L”)
29
SYSRET
O
System reset signal output to the MD mechanism controller (IC501) and SONY bus interface
(IC600) “L”: reset
(IC600) “L”: reset
30
DSTSEL1
I
Destination setting terminal (fixed at “L”)
31
DMOD1
O
D-BASS mode control signal output to the SM5852ES (IC201)
32
TESTIN
I
Setting terminal for the test mode “L”: test mode (normally fixed at “H”)
33
VSS
—
Ground terminal
34
C
—
Connected to capacitor (for coupling)
35
NC
O
Not used (open)
36
BUS ON
O
Bus on/off control signal output to the MD mechanism controller (IC501) and SONY bus
interface (IC600) “L”: bus on
interface (IC600) “L”: bus on
37
AD ON
O
Power supply on/off control signal output for the A/D converter “L”: power on
38
DVCC
—
Power supply terminal (+5V) (for D/A converter)
39
DVSS
—
Ground terminal (for D/A converter)
40
LCDANG
O
Output signal for the LCD view angle adjustment “H”: When front panel is full open
41
VOL CE
O
Chip enable signal output to the electrical volume (IC300)
42
AVCC
—
Power supply terminal (+5V) (for A/D converter)
43
AVRH
I
Reference voltage (+5V) input terminal (for A/D converter)
44
AVRL
I
Reference voltage (0V) input terminal (for A/D converter)
45
AVSS
—
Ground terminal (for A/D converter)
46
KEY IN0
I
Key input terminal (A/D input) OFF, SOURCE, SEEK/AMS
+ ) + = 0 – ,
SOUND, SHIFT, 1, 2, 3, 4 keys input (LSW801 to LSW804 and LSW806 to LSW811)
47
KEY IN1
I
Key input terminal (A/D input)
6, DSPL, LIST PTY, AF/TA, 10, 9, 8, 7, 6, 5 keys input (LSW812 to LSW821)
6, DSPL, LIST PTY, AF/TA, 10, 9, 8, 7, 6, 5 keys input (LSW812 to LSW821)
48
KEY IN2
I
Key input terminal (A/D input) Not used (fixed at “L”)
49
RC IN0
I
Rotary remote commander shift key A/D input terminal
TYPE A: MB90574PFV-G-113-BND
TYPE B: MB90F574PFV-G-113
TYPE B: MB90F574PFV-G-113
Click on the first or last page to see other MDX-C7890R service manuals if exist.