Sony MDX-C7900, Service Manual

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