Sony SCD-1/777ES, Service Manual

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MAIN BOARD IC711 CXD1095R (EXPANDER)
Pin No. Pin Name I/O Description
1 AK1 O
2 AK2 O
3 MON3 O
4 MON4 O Monitor signal output terminal Not used (open)
5 MON5 O
6 MON6 O
7 MON7 O
8 VSS —
Ground terminal
9 WADCE O
Watermark signal output to the RF AD (IC708)
10 TEST O
Test signal output to the DSD decoder (IC703) “H”:active
11 WMGC0 O
RF gain control for watermark signal output to the RF AD (IC708)
12 WMGC1 O
RF gain control for watermark signal output to the RF AD (IC708)
13 SHR RST O
Reset signal output to the DSD decoder (IC703)
14 SHR MUTE O Mute signal output to the DSD decoder (IC703)
15 SHR LT O
Latch pulse signal output to the DSD decoder (IC703)
16 — O
Not used (open)
17 NC — Not used (open)
18 FWON O
FWON signal output to the ARP (IC702)
19 MD2 O
CD-TX mute signal output to the ARP (IC702)
20 MUTE O CD-DA mute signal output to the ARP (IC702)
21 ARP RST O
Reset signal output to the ARP (IC702)
22 DFCT I
DFCT signal input from the ARP (IC702)
23 VSS — Ground terminal
24 VDD —
Power supply terminal (+5V)
25 NORF I
NORF signal input from the ARP (IC702)
26 LOCK I Lock signal input from the ARP (IC702)
27 FIL SET I
Filter select signal input from the STANDARD/CUSTOM switch (S173) “L”:CUSTOM “H”
:STANDARD
28 D0 I/O
29 D1 I/O Two-way data bus with the CPU (IC701)
30 D2 I/O
31 NC —
Not used (open)
32 NC — Not used (open)
33 D3 I/O
34 D4 I/O
35 D5 I/O
Two-way data bus with the CPU (IC701)
36 D6 I/O
37 D7 I/O
38 XCLR I
Clear signal input terminal (pull up)
39 XDIS I Reset signal input from the ARP (IC702)
40 VSS —
Ground terminal
41 XWR I
Strobe signal input from the CPU (IC701)
42 XRD I Strobe signal input from the CPU (IC701)
43 XCS I
Chip enable signal input from the CPU (IC701)