Read Panasonic CQ-LM8281K / CQ-LM8282K Service Manual online
6.1. Main Block
IC601 : C2BBGF000324
Pin
No.
No.
Port
Descriptions
I/O
FM
(V)
AM
(V)
TP
(V)
1
ST-SW
Stearing SW
I
4.9 4.9 4.9
2
VCONT
Phase diff. Level
detection
detection
I
3.8 3.7 3.6
3
OFFSET_IN
Amp. offset input
I
5.0 5.0 5.0
4
EQ
Metal tape detection
I
4.8 4.8 4.8
5
LCD.CONT
Panel illumi. control
O
5.0 5.0 5.0
6
ANT.CONT
Motor antenna conntrol
O
5.0 5.0 5.0
7
TEL.IN
Telephone mute input
I
4.9 4.9 4.9
8
BIT3
Tape mode SW
I
5.0 5.0
0
9
BIT1
Tape mode SW
I
0
0
5.0
10
BIT2
Tape mode SW
I
5.0 5.0 5.0
11
END-B
Tape end detection
I
4.9 4.9
0
12
END-A
Tape end detection
I
5.0 4.9 1.0
13
PLL DATA
PLL data output
O
5.0 5.0 5.0
14
PLL CLK
PLL data shift clock
O
5.0 5.0 5.0
15
NC
No connection
-
-
-
-
16
RD.CONT
Radio power control
O
0
0
8.5
17
M2F
Tape motor control
O
0
0
.05
18
PCCONT
System power control
O
5.0 5.0 5.0
19
NC
No connection
-
-
-
-
20
M1-B
Tape motor control
O
0
0
0
21
GND
Ground
-
0
0
0
22
VDD
+5V power supply
-
5.0 5.0 5.0
23
M1-A
Tape motor control
O
0
0
0
24
AMP.CONT
Power amp. stand-by
O
5.0 5.0 5.0
25
MUTE
Mute output
O
5.0 5.0 5.0
26
COMBI.CONT COMBI.control signal
O
5.0 5.0 5.0
27
NC
No connection
-
0
0
0
28
NC
No connection
-
-
-
-
29
NC
No connection
-
-
-
-
30
VDD (PLL)
PLL +5V power supply
-
5.0 5.0 5.0
31
NC
No connection
-
-
-
-
32
NC
No connection
-
-
-
-
33
GND (PLL)
Ground
-
0
0
0
34
NC
No connection
-
-
-
-
35
NC
No connection
-
-
-
-
36
GND
(Connecting to ground)
-
0
0
0
37
VOL.CLK
Clock for Electronic
volume
volume
O
0
0
0
38
VOL.DATA
Data for Electronic
volume
volume
O
0
0
0
39
AUX.CONT_I
N
N
CD-CH control signal
O
5.0 5.0 5.0
40
SIYOU1
(Connecting to ground)
-
0
0
0
41
SIYOU2
(Connecting to ground)
-
0
0
0
42
SEC LED
Secyrity LED on/off
-
0
0
0
43
CA PWER
Tape power control
O
0
0
5.0
44
A/B IN
Tape side detection
I
5.0 5.0 5.0
45
T-IN
Tape detection
I
5.0 5.0
0
46
MSM
MS gain control
O
0
0
0
47
EN_A
Volume encode data
I
5.0 5.0 5.0
48
EN_B
Volume encode data
I
5.0 5.0 5.0
49
A/B OUT
Tape forward/reverse
selection
selection
O
0
0
5.0
50
DOLBY
Dolby control
O
0
0
5.0
51
T_LOAD
Tape loading detection
I
5.0 5.0
0
52
MS(PL/FF)
MS mode selection
O
0
0
0
53
MS
TPS np sound detection
I
4.3 4.3 4.9
54
TAPE CONT
Tape power control
O
0
0
5.0
55
TP
Test point
O
5.0 5.0 5.0
56
WP
Write protection
O
0
0
0
57
SD
B/S detection
I
3.8 3.8 1.9
58
ST
FM stereo detetion
I
5.0 5.0 5.0
59
BEEP
Beep output
O
0
0
0
60
LCD.IN-
LCD data
I
5.0 5.0 5.0
61
CD.CE
LCD driver chip enable
O
0
0
0
62
LCD.CLK
LCD clock
O
0
0
0
63
LCD.DO
LCD/Security data
O
0
0
0
Pin
No.
No.
Port
Descriptions
I/O
FM
(V)
AM
(V)
TP
(V)
64
E2P.STB
Security data strobe
O
0
0
0
65
E2P.DI
Security data
I
0
0
0.6
66
AUX_IN
AUX detection
I
5.0 5.0 5.0
67
BATT-DET
Battery level detection
I
50
5.0 5.0
68
ACC-DET
ACC level detection
I
5.0 5.0 5.0
69
TAPE-EJ
Tape eject switch
I
4.9 4.9 4.9
70
ILL-DET
ILL- detection
I
5.0 5.0 5.0
71
JAC_CONT
AUX audio signal enable
O
5.0 5.0 5.0
72
CDCH_IN
CD.CH BUS data
I
5.0 5.0 5.0
73
CD-CH.OUT
CD.CH BUS data
O
0
0
0
74
REG CPU
Bypass capacitor terminal
-
3.6 3.6 3.6
75
GND
Ground
-
0
0
0
76
X2
Crystal osillator
-
1.6 1.6 1.6
77
X1
Crystal osillator
-
1.5 1.5 1.5
78
REG OSC
Bypass capacitor terminal
-
3.5 3.5 3.6
79
VDD
+5V power supply
-
5.0 5.0 5.0
80
RESET
Reset input
I
5.0 5.0 5.0
Note :
Voltage measuerments are with respect to ground, with a
voltmeter (Internal resistance : 10M ohms.)
voltmeter (Internal resistance : 10M ohms.)
6.2. Display Block
IC901 : YEAMLC75853
Pin
No.
No.
Port
Descriptions
I/O
Vol
(V)
(V)
1-14
SEG1-14
LCD segment data
O
2.6
15-30 -
Not used
-
-
31-40 SEG15-24
LCD segment data
O
2.6
41-43 COM1-3
LCD common output
O
2.6
44-48 KS1-5
Key scan signal
O
5.2
49
-
Not used
-
-
50-53 KI1-4
Key data input
I
0
54
-
Not used
-
-
55
TEST
(Connecting to ground)
-
0
56
VDD
+5V power supply
-
5.2
57
VDD1
Ground through capacitor
-
3.5
58
VDD2
Ground through capacitor
-
1.8
59
VSS
Ground
-
0
60
OSC
CR oscillator
-
4.1
61
D2
key data output
O
5.2
62
CE
Chip enable
I
0
63
CLK
LCD clock
I
0
64
D1
LCD data input
I
0
6 TERMINALS DESCRIPTION
5
MAZDA / CQ-LM8281K / CQ-LM8282K
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