Panasonic CQ-JM8481K / CQ-JM8482K Service Manual ▷ View online
6 BLOCK DIAGRAM
5
MAZDA / CQ-JM8481K / CQ-JM8482K
7.1. Main Block
IC601 : C2CBHG000133
Pin
No.
Port
Descriptions
I/O
FM
AM
CD
1
VOL. ENA
Input A of VOL rotary
encoder
encoder
I
0
0
0
2
NC
-
-
-
-
-
3
NC
-
-
-
-
-
4
CD. SW1
NCD-9 SW1 input L: Disk.
I
5.1
5.1
0
5
CD. SW3
NCD-9 SW3 input L: Disk.
I
5.1
5.1
0
6
CD RESET CD reset signal output
(L:CD reset)
O
4.7
4.7
4.7
7
CD ON
CD deck power supply
control output H:CD deck
microcomputer
communication.
control output H:CD deck
microcomputer
communication.
O
0
0
4.7
8
CD CLK
CD deck serial clock
output
output
O
0
0
4.7
9
CD D0
CD deck serial input
I
5.1
5.1
3.5
10
CD SIM
CD deck serial output
O
0
0
1.6
11
RESET
Microcomputer reset input
detection L:RESET
detection L:RESET
I
4.7
4.7
4.7
12
NC
-
-
-
-
-
13
NC
(Connecting to ground)
-
0
0
0
14
VSS
Ground
-
0
0
0
15
X2
Crystal oscillator terminal
-
1.5
1.5
1.5
16
X1
Crystal oscillator terminal
I
1.4
1.4
1.4
17
REG OFF
(Connecting to ground)
-
0
0
0
18
REGC
(Ground pull-down)
-
3.5
3.5
3.5
19
VDD
+5V power supply
-
4.8
4.8
4.8
20
JACK IN
AUX pin jack input
detection
detection
I
5.0
5.0
5.0
21
JACK
CONT
CONT
Pin jack input signal
control output H: Pin jack
input OFF
control output H: Pin jack
input OFF
O
4.8
4.8
4.8
22
NC
-
-
-
-
-
23
TP
Signal input for inspection
I
5.0
5.1
5.0
24
CL
LCD clock output
O
0
0
0
25
CE
LCD strobing output
O
0
0
0
26
DATA IN
Input for CD-R reading
I
0
0
0
27
DATA
CONT
CONT
Output for CD-R reading
O
0
0
0
28
NC
-
-
-
-
-
29
D2
LCD data input
I
5.1
5.1
5.1
30
D1
LCD data output
O
0
0
0
31
NC
-
-
-
-
-
32
NC
-
-
-
-
-
33
NC
-
-
-
-
-
34
NC
-
-
-
-
-
35
P. CONT
System power supply
control output H: System
power supply ON
control output H: System
power supply ON
O
4.8
4.8
4.7
36
LCD.
CONT
CONT
LCD backlight control
output H: Back light ON
output H: Back light ON
O
4.8
4.8
4.7
37
SIYOU1
Destination setting input
(Thailand: L EX9K:H,
EX5K : H)
(Thailand: L EX9K:H,
EX5K : H)
I
0
0
0
38
SIYOU2
Destination setting input
(Thailand: L EX9K:L ,
EX5K : H)
(Thailand: L EX9K:L ,
EX5K : H)
I
0
0
0
39
LED. CONT LED lighting output H:LED
ON (LED ON when CD is
inserted)
inserted)
O
0
0
4.7
40
VSS
Ground
-
0
0
0
41
VDD
+5V power supply
-
4.8
4.8
4.8
42
COMBI.
CONT
CONT
AUX output signal
O
0
0
0
Pin
No.
Port
Descriptions
I/O
FM
AM
CD
43
AUX.
CONT_IN
CONT_IN
AUX input signal
I
5.0
5.1
5.0
44
E2P. DIN
E2P data input
I
4.8
4.8
4.7
45
E2P. DOUT E2P data output
O
0
0
0
46
E2P. CLK
E2P clock output
O
0
0
0
47
E2P. STB
E2P strobing output
O
0
0
0
48
NC
-
-
-
-
-
49
TEL MUTE TEL signal input H:MUTE
OFF from vehicle
I
4.9
4.9
4.9
50
VOL.. CLK Electron VOL clock output
O
0
0
0
51
VOL..
DATA
DATA
Electron VOL data output
O
0
0
0
52
AMP. STBY Power amplifier control
output H: Power amplifier
ON
ON
O
4.8
4.8
4.8
53
NC
-
-
-
-
-
54
NC
-
-
-
-
-
55
NC
-
-
-
-
-
56
MUTE
MUTE output H:MUTE ON
O
4.8
4.8
4.8
57
BUSOUT
M-BUS data output
O
0
0
0
58
NC
-
-
-
-
-
59
NC
-
-
-
-
-
60
NC
-
-
-
-
-
61
NC
-
-
-
-
-
62
NC
-
-
-
-
-
63
NC
-
-
-
-
-
64
WP
Packing E2PROM write-
protection output signal H:
Write-protection solution
protection output signal H:
Write-protection solution
O
0
0
0
65
SDA
PLL data I/O signal
I/O
5.1
5.1
5.1
66
NC
-
O
-
-
-
67
NC
-
O
-
-
-
68
SD
SD input H: No radio
station.
station.
I
5.0
5.0
2.6
69
SCL
PLL data clock output
O
4.8
4.8
4.8
70
ST
FM stereo input H:MONO
L:ST
L:ST
I
5.1
5.1
2.9
71
NC
-
-
-
-
-
72
NC
-
-
-
-
-
73
IC
(Ground pull-down)
O
0
0
0
74
ST SW
Steering wheel SW signal
input
input
I
5.0
5.0
5.0
75
V. CONT
Input for radio field
strength judgment
strength judgment
I
3.9
4.0
0
76
CLIP DET
Power IC offset detection
input
input
I
5.1
5.1
5.1
77
NC
-
-
-
-
-
78
NC
-
-
-
-
-
79
NC
-
-
-
-
-
80
NC
-
-
-
-
-
81
NC
-
-
-
-
-
82
AVDD
+5V power supply
-
4.8
4.8
4.8
83
AVREF
Input terminal of reference
voltage of analog to digital
converter
voltage of analog to digital
converter
-
5.1
5.1
5.1
84
AVSS
Ground
-
0
0
0
85
RX
Ground
-
0
0
0
86
OPEN
-
-
-
-
-
87
ACC. DET
ACC detection input
H:ACC ON from vehicle
H:ACC ON from vehicle
I
4.7
4.7
4.7
88
NC
Ground
I
0
0
0
89
ILL DET IN ILL detection input H:ILL
OFF from vehicle
I
5.0
5.0
5.0
90
NC
(VDD pull-up)
I
4.8
4.8
4.8
91
MBUS IN
M-BUS data input
I
4.8
4.8
4.8
92
CD. EJ
CD EJECT key pressing
detection L:Eject key ON
detection L:Eject key ON
I
4.8
4.8
4.8
7 TERMINALS DESCRIPTION
6
MAZDA / CQ-JM8481K / CQ-JM8482K
Pin
No.
Port
Descriptions
I/O
FM
AM
CD
93
BATT DET BATT detection input H:+B
ON from vehicle
I
4.8
4.7
4.7
94
NC
(VDD pull-up)
I
4.8
4.8
4.8
95
SIG IN
-
-
-
-
-
96
SIG OUT
-
-
-
-
-
97
RADIO. ON Radio power supply control
output H: Radio power
supply ON
supply ON
O
4.8
4.8
0
98
ANT.
CONT
CONT
Antenna output H:ANT ON
O
4.7
4.7
0
99
BEEP
BEEP output 3kHz 100ms
O
0
0
0
100 VOL ENB
Input B of VOL rotary
encoder
encoder
I
0
0
0
7.2. Display Block
IC901 : YEAMLC75853
Pin
No.
No.
Port
Descriptions
I/O
Vol
(V)
(V)
1-3
SEG1-3
LCD segment data
O
2.5
4, 5
-
Not used
-
-
6-15
SEG13-4
LCD segment data
O
2.5
16-26
-
Not used
-
-
27-37 SEG14-24
LCD segment data
O
2.5
38-40
-
Not used
-
-
41-43 COM1-3
LCD common output
O
2.5
44-47 KS1-4
Key scan signal
O
5.0
48
-
Not used
-
-
49
KS6
Key scan signal
O
5.0
50-53 KI1-4
Key data input
I
0
54
-
Not used
-
-
55
TEST
(Connecting to ground)
-
0
56
VDD
+5V power supply
-
5.0
57
VDD1
Ground through capacitor
-
3.3
58
VDD2
Ground through capacitor
-
1.7
59
VSS
Ground
-
0
60
OSC
CR oscillator
-
3.9
61
D2
key data output
O
5.0
62
CE
Chip enable
I
0
63
CLK
LCD clock
I
0
64
D1
LCD data input
I
0
7
MAZDA / CQ-JM8481K / CQ-JM8482K
IC201 : C0ABAB000001
IC204, 304 : C0JBAS000051
IC202 : C1BB00000284
IC203 : C1EA00000040
IC701 : C0DBFGD00001
IC710 : AN8065SE1
8 PACKAGE AND IC BLOCK DIAGRAM
8.1. Main Block
8
MAZDA / CQ-JM8481K / CQ-JM8482K
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