Sony MCE-K550 Service Manual page 22

Pin No. Pin Name I/O
51 ECHO MUTE O
52 KARAOKE I
53 MODEL1 I
54 MODEL2 I
55 to 61 A15 to A9 —
62 Vcc —
63 A8 —
64 Vss —
65 to 68 A7 to A4 —
69 to 72 A3 to A0 O
73 TESTLED O
74 TEST1 I
75 TEST2 I
76 TEST3 I
77 XRST OUT O
78 PWONLED O
79 FLCS O
80 XBLK O
81 to 88 D7 to D0 I/O
89 MICCONT I
90 to 92 KEY0 to KEY2 I
93 N/P SW I
94 MUSICVOL I
95 VOCALVOL I
96 AVss —
97 ECHOVOL I
98 VREF —
99 AVcc —
100 DNRCS O
Echo mute input (H: Echo mute) (K750) (Not used:K550)
KARAOKE mode select switch (H: KARAOKE, L: NORMAL (K750) (Not used:K550)
K550 model select (H: K550) (Not used:K750)
K750 model select (H: K750) (Not used:K550)
(Not used)
Power supply (+5V)
(Not used)
Ground
(Not used)
Address bus output
Check LED control
Test mode 1. Normally "H"
Test mode 2. Normally "H"
Test mode 3. Normally "H"
Device system reset
STANDBY LED lighting signal output (H: lighting)
FL tube driver, chip enable
FL tube turning off output
Data bus input/output
A/D port for MIC control input (K750) (Not used:K550)
A/D port for key input
NTSC/PAL output mode setting terminal
A/D port music volume input (K750), ATT select (K550)
A/D port music volume input (K750) (Not used:K550)
Ground
A/D port for echo volume input (K750) (Not used:K550)
Power supply (+5V)
Power supply (+5V)
DNR chip select
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Description