Sony MDX-CA790X Service Manual page 39

Fm/mw/lw minidisc player
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• MAIN BOARD IC600 MN101E01KDA1 (SYSTEM CONTROLLER)
Pin No.
Pin Name
1
DAVDD
2
NCO
3
DAVSS
4 to 9
NCO
10
VDD1
11
MMOD
12
OSCOUT
13
OSCIN
14
VSS1
15
XIN
16
XOUT
17
VDD2
18
MOD1
19
RESET
20
RCIN1
21
ACCIN
22
TESTIN
23
TELLATT
24
ATT
25
ADON
26
NCO
27
KEYACK
28
TUATTIN
29
MDON
30
MDMON
31
BUIN
32
NCO
33
UNISO
34
UNISI
35
UNICKO
36 to 38
NCO
39
OPENREQ
40
BUSON
41
MDBOOT
42
SYSRST
43 to 50
NCO
51
AMPATT
52
DEST1
53, 54
DEST2, DEST3
55
DOORSW
I/O
Power supply terminal (+3.3V)
O
Not used
Ground terminal
O
Not used
Power supply terminal (+3.3V)
I
Internal flash memory data write mode detection signal input terminal Not used
O
System clock output terminal (27.648 MHz)
I
System clock input terminal (27.648 MHz)
Ground terminal
I
System clock input terminal (32.768 kHz)
O
System clock output terminal (32.768 kHz)
Power supply terminal (+3.3V)
I
Setting terminal for the CPU operational mode fixed at "H"
System reset signal input from the reset signal generator and reset switch "L": reset
I
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
I
Rotary remote commander shift key input terminal
I
Accessory power detection signal input terminal "L": accessory power on
I
Test mode setting terminal "L": test mode, normally fixed at "H"
Telephone muting detection signal input terminal
I
At input of "H", the audio signal is attenuated by 20 dB
O
Audio muting on/off control signal output terminal
A/D converter power control signal output
O
When the KEY ACK (pin 27) that controls reference voltage power for key A/D conversion input
is active, "L" is output from this terminal to enable the input
Not used
Acknowledge signal (wake up signal) input terminal for the key entry Acknowledge signal is
I
input to accept any function key in the standby status On at input of "H"
I
Tuner muting zero-cross detection signal input terminal
I
Power supply on/off control signal input of the servo section
I
Power supply on/off control signal input of the MD mechanism deck section
I
Back up power supply detection signal input terminal "L" is input at low voltage
O
Not used
O
Serial data output to the SONY bus interface IC
I
Serial data input from the SONY bus interface IC
Serial data transfer clock signal output to the SONY bus interface IC and MD mechanism
O
controller
O
Not used
O
Front panel open request signal output terminal Not used
O
SONY bus on/off control signal output terminal "L": bus on
O
Internal flash memory data write control signal output terminal Not used
O
System reset signal output to the MD mechanism controller and SONY bus interface IC
O
Not used
O
Amplifier muting on/off control signal output terminal Not used
I
Setting terminal for the destination
I
Setting terminal for model discrimination Not used
I
Front panel open/close detection input terminal "L": close
Description
MDX-CA790X
39

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