JVC MX-J300 Service Manual page 36

MX-J300
UPD78055GCA37 (IC251):CD Changer control
1. Terminal Layout
2. Pin function
Pin
symbol I/O
No.
DEMPH Deemphasis input
1
I
DEMPHO
2 Deemphasis output
O
OS OFF On screen display on/off
3 I
-
AVSS Connected to GND
4
MCS I Mode control select
5
6
MRDY
SUB Ready
I
7
- AV reference
AVREF1
8
KCMND SVC3 Serial data out put
9
O
MSTAT SVC3 Status input input
10
I
KCLK
SVC3 Serial clock input
11
I
SUB Sub-code Q code output
12
O
RST Reset signal input (L : Reset)
13
I
SQCK Outside clock for sub-code Q resister input
14
I
DMUTE
Digital mute
15
O
MREQ Not used
-
16
VCDEMP Not used
-
17
SRDATA Not used
18
- Not used
SRCLK
19~26 CAM0~7 I CAM SW input
27~29
1~3SSW Sub tray SW input
I
30~32
3~1MSW
I Sub tray SW output
-
VSS
33 Connected to GND
I
34 DISC Disk sensor
I Test mode(Not used)
35 SHIFT
36
MNT I
Test mode(Not used)
37
MNT1
Test mode(Not used)
I
38
MNT2 Test mode(Not used)
I
Not used
39
-
VCORST
O
40 LMUP
L CAM up
1-36
20 ~ 1
21
80
40
61
41 ~ 60
Description
Pin
Symbol I/O
No.
LM DOWN O
41 L CAM down
RM UP
42 O R CAM up
O
RMDOWN R CAM down
43
Not used
44 CHECK I
45 CHECK1 I Not used
CHECK2 Not used
46 I
47 I Not used
CHECK3
48~59 connected to GND
60
RESET I VC3 reset out
STAT
61 I
Statues signal
62 HREG O Not used
63 HRDY
I
Not used
64 DRMUTE
O BTL Driver mute
65
MCLK com command clock signal input
I
MDATA
I
com command data input
66
MLD com command lode signal input
67
I
68
- Power supply (for X' tal Q oscillation circuit)
VDD
X2
Out of X' tal oscillation circuit
69
O
X1 Input of 16.9344MHz X' tal oscillation circuit
70
I
71 IC connected to GND
-
XT2
72 - Not used
73
I
REST Rest SW input
-
74
AVDD A/D converter power supply
-
75 Digital GND
AVREF
- Not used
76
SSEL
- Not used
77
MSEL
-
Not used
78
PSEL
O Data select out
79 IOSEL
O
P ON Power ON/OFF
80
Description