Sony XR-1800R Service Manual page 27

Pin No. Pin Name I/O
43 LCD CE
44 LCD CLK
45 NCO
46 LCD SO
47 VDD2
48 AVDD
49 AVREF+
50 KEYIN1
51 KEYIN0
52 KEYSEL1
53 KEYSEL0
54 DSTSEL1
55 DSTSEL0
56 NIL
57 FM VSM
58 AVREF–
59 AVSS
60 GND
61, 62 NCO
63 SEEK OUT
64 TUN ON
65 FM ON
66 MUTE
67 AF SEEK
68 NCO
69 NOSESW
70 ST IN I/O
71 SD IN
72 NIL
73 PW SEL
74 to 78 NIL
79 TEST
80 NIL
O Chip enable output to the liquid crystal display driver (IC900)
O Serial data transfer clock signal output to the liquid crystal display driver (IC900)
O Not used (open)
O Serial data output to the liquid crystal display driver (IC900)
— Power supply terminal (+5V)
— Power supply terminal (+5V) (for A/D converter)
I Reference voltage input terminal (+5V) (for A/D converter)
I Key input terminal (A/D input) OFF, PTY, LOUD, 6/5/3/2/4/1 ATA keys input (S950 to 957)
Key input terminal (A/D input) AF/TA, TUNER BTM, SEEK MANU +/–, DSPL, LEVEL +,
I
SEL, LEVEL – keys input (S920 to 927)
I Setting terminal for the key function (fixed at "L")
I Setting terminal for the key function (fixed at "L")
I Destination setting terminal (fixed at "L")
I Destination setting terminal (fixed at "L")
I Not used (fixed at "L")
I FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU100)
I Reference ground terminal
— Ground terminal (for A/D converter)
— Ground terminal
O Not used (open)
O Seek control signal output to the FM/AM tuner unit (TU100)
O Tuner system power supply on/off control signal output terminal "H": tuner on
O FM system power supply on/off control signal output terminal "H": FM on
O Line muting control signal output terminal "H": line muting on Not used (open)
PLL low-pass filter time constant selection signal output at AF seek
O
"H" is output when AF seek
O Not used (open)
I Detects the removal of the attaching and removing type front panel block "L": attaching
Input of FM stereo detection signal from FM/AM tuner unit (TU100), and output of forced
monaural control signal to FM/AM tuner unit (TU100) (Commonly used for stereo display
input and forced monaural output)
FM stereo detection at input of "L", forced monaural at output of "L"
Station detector detect input from the FM/AM tuner unit (TU100)
I
Stop level for SEEK, BTM, etc. is determined SD is present at input of "H"
I Not used (fixed at "L")
Power select switch input terminal
I
"L": halt mode, "H": operation mode Not used (fixed at "L" in this set)
I Not used (fixed at "L")
I Setting terminal for the test mode "L": test mode (normally fixed at "H")
I Not used (fixed at "L")
Function
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