Panasonic CQ-LM8280K Service Manual ▷ View 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-LM8280K
∙
Power Supply Voltage : DC13.2V
∙
Output Impedance : 4
Ω
∙
Output Power : 0.5W
∙
Balance, Fader Control : center
∙
Bass, Treble Control : Center
∙
Dolby NR: OFF
7 ALIGNMENT INSTRUCTIONS
7.1. Alignment Conditions
Note :
Do not align the FM/AM package block. When the package block is necessary, it will be supplied already aligned at the
factory.
factory.
7.2. Dolby NR Alignment
Step
Alignment Item
Test Tape
VTVM Connection
Adjust
Remarks
(1)
DOLBY NR Rch
RFKZ0038
TP201
VR201
Adjust for 388mV ±1.0dB
(2)
DOLBY NR Lch
RFKZ0038
TP301
VR301
Adjust for 388mV ±1.0dB
8 ALIGNMENT POINTS
6
MAZDA / CQ-LM8280K
IC240, 340 : C0JBAS00051
IC702 : YEAMLB1930MT
IC704 : AN8065SE1
9 PACKAGE AND IC BLOCK DIAGRAM
9.1. Main Block
PA101 : YEP0PTB566A0
7
MAZDA / CQ-LM8280K
IC201 : C1BB00000284
IC230 : C1EA00000028
8
MAZDA / CQ-LM8280K
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