Explanation Of Ic Terminals - Sony HCD-H331 Service Manual

IC501 ASD042 (SYSTEM CONTROL /FL DRIVE)
Pin No. Pin name
1-7 GR1-7
8 V
DD
9, 10 LED9, 10
11 KEY SELECT
12 VOL IN B
13 REQ. GM
14 CLK MG
15 DATA GM
16 DATA MG
17 RESET
18 PANEL SW
19 LED SELECT
20 AV
SS
21-24 SPEANA IN1-4
25-28 KEY IN 1-4
29 AV
DD
30 AVREF
31 JOG IN B
32 XT2
33 V
SS
34 X1
35 X2
36, 37 LED7, 8
38, 39 LED5, 6
40-43 LED1-4
44 VOL IN A
45 JOG IN A
46 RDY MG
47 SIRCS IN
48 IC (VPP)
49-51 LEDS11-13
52 V
DD
53-70 SEG5-22
71 V. LOAD
72-75 SEG1-4
76-80 GR8-12
Abbreviation
r
FL : FLUORESCENT INDICATOR TUBE
SECTION 6

EXPLANATION OF IC TERMINALS

I/O
O FL grid signal output.
– +5V
O LED drive signal open.
O Not used. (Open)
I Volume encoder signal input.
I/O Request signal from/ to master control.
I Serial clock input.
O Serial data output.
I Serial data input.
I Reset signal input.
I CD door open detection input. Not used. (Open)
O LED select signal output.
– Ground.
I Spectram analizer signal input. Not used (Ground)
I Key matrix input.
–
+5V.
–
I Not used. (Ground)
I Not used. (Open)
– Ground.
I
X'tal (5MHz)
O
O LED drive signal output.
O Not used. (Open)
O LED drive signal output.
I Volume encoder signal input.
I Not used. (Ground)
I RDY signal from master control.
I SIRCS signal input.
– Ground connection.
O LED drive signal output.
– Not used.
O FL segment signal output.
– –25V for FL
O FL segment signal output.
O FL grid signal output
– 14 –
Description