Sony XES-Z50, Service Manual, Page: 72 / 153

– 72 –
Pin No. Pin Name I/O Function
38 A2 O
39 A3 O
40 A4 O
41 A5 O
42 A6 O
43 A7 O
44 VSS —
Ground terminal
45 A8 O
46 A9 O
47 A10 O
48 A11 O
49 A12 O
50 A13 O
51 A14 O
52 A15 O
53 A16 O
54 A17 O
55 A18 O
56 A19 O
57 VSS —
Ground terminal
58 MUTE O
Relay drive signal output for the speaker protect relay (RY1101, 1201, 1301)
At output of “L”, the relay is turned on to apply muting
59 SMUTE O
Soft mute control signal output to the electrical volume (IC1106, 1206, 1306) “H”: mute on
60 EMP-O O
Emphasis control signal output to the digital filter (IC1101, 1201, 1301) “H”: emphasis on
61 NCO O System clock signal output terminal Not used (open)
62 STBY I Standby signal input terminal Fixed at “H” in this set
63 SYSRES I
System reset signal input from the reset signal generator (IC303) and bus interface (IC306) (for
SONY bus) “L”: reset For several hundreds msec. after the power supply rises, “L” is input,
then it changes to “H”
64 BU-IN I Backup power supply detect signal input terminal (used also to reset standby)
65 VSS — Ground terminal
66 X-IN I System clock input terminal (14.74 MHz)
67 EX-IN I System clock input terminal (14.74 MHz)
68 VDD — Power supply terminal (+5V)
69 AS O Address strobe signal output terminal Not used (open)
70 RD O
Strobe signal output for data reading to the digital signal processor (IC101, 201 CXD2711Q)
and flash memory (IC401, 402)
71 HWR O
Strobe signal output for upper byte data writing to the digital signal processor (IC101, 201
CXD2711Q) and flash memory (IC402)
72 LWR O Strobe signal output for lower byte data writing to the flash memory (IC401)
73 MD0 I Input terminal for setting microcomputer operation mode (fixed at “L”)
74 MD1 I
Input terminal for setting microcomputer operation mode (fixed at “H”)
75 MD2 I
Input terminal for setting microcomputer operation mode (fixed at “H”)
76 AVDD —
Power supply terminal (+5V) (for A/D conversion)
77 AVREF I
Reference voltage input terminal (+5V) (for A/D conversion)
78 NIH I
Fixed at “H” in this set
Address signal output to the flash memory (IC401, 402)
Address signal output to the flash memory (IC401, 402)