Sony MDX-C7900 Service Manual page 44

Pin No. Pin Name
47 KEY IN1
48 KEY IN2
49 RC IN0
50 D-BASS IN
51 NC
52 MPDH (MTP)
53
S METER (VSM)
54 VCC
55 AMP ATT
56 AMP ON
57 ILL IN
58 LOCK IN
59 EMPH ON
60 AU ATT
61 AF ATT
62 TU ATT
63 VSS
64 ACC IN
65 AF SEEK
66 NC
67 DAVN
68, 69 NC
70 RDS SI
71 RDS CKI
72 RC IN1
73 X1A
74 X0A
75 NC
76 BU IN
77, 78 NC
79 KEYACK
80
TEL ATT
81 ST IN/MONO
82 SEEKOUT
83 SD IN
84 NC (MONO)
I/O
Key input terminal (A/D input)
MDX-C7900: Z, LIST, DSPL, 10, 9, 8, 7, 6, 5 keys input (LSW812 and LSW814 to LSW821)
I
MDX-C7900R: Z, DSPL, LIST PTY, AF/TA, 10, 9, 8, 7, 6, 5 keys input
(LSW812 to LSW821)
I Key input terminal (A/D input) Not used (fixed at "L")
I Rotary remote commander shift key A/D input terminal
I D-BASS switch (LSW805) input terminal (A/D input)
I Not used (fixed at "L")
I Multi path input from the RDS decoder (IC102) Used for the MDX-C7900R only
I FM and AM (MW/LW) signal meter voltage detection input from the FM/AM tuner unit (TU1)
—
Power supply terminal (+5V)
O Muting control signal output to the power amplifier (IC500) "H": muting on
O Standby control signal output to the power amplifier (IC500) "L": standby, "H": amp on
I Illuminate line detect signal input for the auto dimmer control Dimmer is present at input of "L"
I Mini-disc lock detection signal input from the MD mechanism controller (IC501) "H": lock
O Emphasis control signal output to the D/A converter (IC202) "H": emphasis on
O Audio line muting on/off control signal output terminal "H": muting on
O RDS AF playing attenuate signal output terminal Not used (open)
O Tuner signal (FM and AM) muting on/off control signal output "H": muting on
—
Ground terminal
I Accessory detect signal input terminal "L": accessory on
O
RDS AF seek control signal output terminal Used for the MDX-C7900R only
O
Not used (open)
Data transmit completed detect signal input from the RDS decoder (IC102)
I
Used for the MDX-C7900R only
O
Not used (open)
I
Serial data input from the RDS decoder (IC102) Used for the MDX-C7900R only
Serial data transfer clock signal input from the RDS decoder (IC102)
I
Used for the MDX-C7900R only
I Rotary remote commander shift key A/D input terminal
O Sub system clock output terminal (32 kHz)
I
Sub system clock input terminal (32 kHz)
O
Not used (open)
Battery detect signal input from the SONY bus interface (IC600) and battery check circuit
I
"H": battery on
O
Not used (open)
Input of acknowledge signal for the key entry Acknowledge signal is input to accept function
I
and eject keys in the power off status On at input of "H"
I Telephone muting signal input terminal At input of "L", the signal is attenuated by –20 dB
Input of FM stereo detection signal from FM/AM tuner unit (TU1), and output of forced
monaural control signal to FM/AM tuner unit (TU1) (Commonly used for stereo display input
I/O
and forced monaural output)
FM stereo detection at input of "L", forced monaural at output of "L"
Seek control signal output to the FM/AM tuner unit (TU1) (AM mode: used for IF count output,
O
SD request, AGC cut etc., FM mode: used for SEEK, BTM, AF playing SD speed up etc.)
Station detector detect input from the FM/AM tuner unit (TU1)
I
Stop level for SEEK, BTM, etc. is determined SD is present at input of "H"
I
Not used (open)
Function
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