Sony HCD-H331 - 6 Explanation of IC Terminals

– 14 –
SECTION 6
EXPLANATION OF IC TERMINALS
IC501 ASD042 (SYSTEM CONTROL /FL DRIVE)
1-7 GR1-7 O FL grid signal output.
8VDD – +5V
9, 10 LED9, 10 O LED drive signal open.
11 KEY SELECT O Not used. (Open)
12 VOL IN B I Volume encoder signal input.
13 REQ. GM I/O Request signal from/ to master control.
14 CLK MG I Serial clock input.
15 DATA GM O Serial data output.
16 DATA MG I Serial data input.
17 RESET I Reset signal input.
18 PANEL SW I CD door open detection input. Not used. (Open)
19 LED SELECT O LED select signal output.
20 AVSS – Ground.
21-24 SPEANA IN1-4 I Spectram analizer signal input. Not used (Ground)
25-28 KEY IN 1-4 I Key matrix input.
29 AVDD –
+5V.
30 AVREF –
31 JOG IN B I Not used. (Ground)
32 XT2 I Not used. (Open)
33 VSS – Ground.
34 X1 I
X’tal (5MHz)
35 X2 O
36, 37 LED7, 8 O LED drive signal output.
38, 39 LED5, 6 O Not used. (Open)
40-43 LED1-4 O LED drive signal output.
44 VOL IN A I Volume encoder signal input.
45 JOG IN A I Not used. (Ground)
46 RDY MG I RDY signal from master control.
47 SIRCS IN I SIRCS signal input.
48 IC (VPP) – Ground connection.
49-51 LEDS11-13 O LED drive signal output.
52 VDD – Not used.
53-70 SEG5-22 O FL segment signal output.
71 V. LOAD – –25V for FL
72-75 SEG1-4 O FL segment signal output.
76-80 GR8-12 O FL grid signal output
r Abbreviation
FL : FLUORESCENT INDICATOR TUBE
Pin No. Pin name I/O Description