Read Panasonic CQ-EH8280A Service Manual online
8.1. Main Block
IC601 : C2CBHG000077
Pin
No.
Port
Description
I/O
(V)
1
BEEP
Beep output
O
0
2
IDC-ST/SP
CD.C start/stop
O
4.9
3
EVOL CLK
Electronic volume clock
O
0
4
EVOL DATA Electronic volume data
O
0
5
SEC-LED
Security LED on/off
O
4.9
6
VOL A
Rotary encoder data
I
0.5
7
VOL B
Rotary encoder data
I
0.5
8
LCD-CLK
Shift clock for LCD data
O
0
9
LCD-DI
LCD data
O
5.0
10
LCD-DO
LCD data
I
0
11
RESET
Reset input
I
4.9
12
XT2
Crystal oscillator terminal
-
2.4
13
XT1
Crystal oscillator terminal
-
0.7
14
VSS
Ground
-
0
15
X2
Crystal oscillator terminal
-
2.3
16
X1
Crystal oscillator terminal
-
1.8
17
REGOFF
(Connecting to VDD)
-
4.9
18
REGC
(Connecting to VDD)
-
4.9
19
VDD
+5V power supply
-
4.9
20
VOL C
Rotary encoder data
I
4.8
21
VOL D
Rotary encoder data
I
0.5
22
LCD-CE
LCD driver enable
O
0
23
BOSE
(Connecting to ground)
-
0
24
SEC-CS
Security ROM chip select
O
0
25
SEC-CLK
Data shift clock for security ROM
O
0
26
SEC-DI
Security data
I
0
27
SEC-DO
Security data
O
0
28
SET-SEC1
(Ground pull-down)
-
0
29
SET-TIME2
(Vdd pull-up)
-
4.9
30
SET-TIME
(Vdd pull-up)
-
4.9
31
P.CONT
COM8V power switch
O
4.8
32
ACC CNT
ACC 5V power switch
O
4.9
33
STB
Power amp. Stand-by
O
4.9
34
LCD ON
LCD illumi. on/off
O
4.9
35
TUNER +B
Motor antenna power
O
4.9
36
PLL-CE
PLL chip select
O
0
37
PLL-DO
PLL data
O
0
38
PLL-CLK
Shift clock for PLL data
O
0
39
PLL-DI
PLL data
I
5.0
40
VSS
Ground
-
0
41
VDD
+5V power supply
-
4.9
42
AREA
(Ground pull-down)
-
0
43
ST-IND
FM stereo detection
I
0.3
44
CA.PON
Tape power control
O
4.9
45
CM.PON
Tape power control
O
4.9
46
M2
Main motor control
O
0
47
M1A
Loading motor control
O
0
48
M1B
Loading motor control
O
0
49
T.IN
Tape-in detection
I
0
50
MSM
MS gain contrl
O
4.9
51
A/B
Tape side detection
I
0
52
M2F
Main motor control
O
0
53
EQ(MTL)
Metal tape mode selection
O
4.9
54
F/R
Tape head change
O
0
55
DOLBY
Dolby NR on/off
O
4.9
56
T.LOAD
Tape loading detection
I
0
57
MS(PL/FF)
MS mode selection
O
0
58
MS
MS detection
I
0
59
REMO3/4
(Ground pull-down)
-
0
60
H.BUSOUT
Not used
-
-
61
NAVI-IN
(Vdd pull-up)
-
4.8
62
NC
No connection
-
-
63
NC
No connection
-
-
64
NAVI-MUTE Not used
-
-
65
BIT1
Tape mode switch
I
4.6
66
END.A
Tape end signal
I
1.5
67
END.B
Tape end signal
I
2.4
68
BIT2
Tape mode switch
I
4.6
69
EQ
Metal/Normal switchl
I
0
70
BIT3
Tape mode switch
I
0
71
NC
No connection
-
-
72
NC
No connection
-
-
73
IC/VPP
(Connecting to ground)
-
0
74
REMO
Remote control signal
O
5.0
75
SW.A
Audio signal switch
O
0
76
SW.B
Audio signal switch
O
0
77
MUTE
Not used
-
-
78
NC
No connection
-
-
79
NC
No connection
-
-
80
VSM
Phase diff. level detection
I
0.6
81
AMP MUTE
Power amp mute
O
0
82
AVDD
+5V power supply
-
4.9
83
AVREF1
Analog reference voltage
I
5.0
84
AVSS
Ground
-
0
85
NC
(Connecting to ground)
-
0
86
NC
No connection
-
-
87
ACC-DET
ACC level detection
I
4.5
88
TAPE EJ
Tape eject SW
I
4.6
89
H.BUS.IN
Not used
-
4.8
90
GAIN
(+5V pull-up)
-
4.8
91
IDCEJECT
CD disc eject SW
I
4.7
92
BAT-DET
Battery level detection
I
4.5
93
EJ.INH
Tape/Disc eject SW
I
4.4
94
IDC-SI
CD.C serial data
O
4.0
95
RXO
Not used
-
0
96
TXO
Not used
-
4.9
97
IDC-CLK
Shift clock for CD.C data
O
4.9
98
IDC-SO
CD.C data
O
1.2
99
CD-RESET
CD.C reset
O
4.9
100
CDON
CD.C controller enable
O
4.9
Note :
Voltage measuerments are with respect to ground, with a
voltmeter (Internal resistance : 10M ohms.)
voltmeter (Internal resistance : 10M ohms.)
8.2. Display Block
IC901 : YEAMLC75853
Pin
No.
Port
Description
I/O
(V)
1, 2 S1, 2
Disc LED on/off
O
0
3
S3
Not used
-
-
4-40 S4-40
LCD segment data
O
2.5
41-43 COM1-3
LCD common
O
2.5
44
S41
LCD segment data
O
2.5
45-49 KS2-6
Key strobe
O
0.9
50-53 KI1-4
Key data
I
0
54
KI5
(Connecting to ground)
-
0
55
TEST
(Connecting to ground)
-
0
56
VDD
+5V power supply
-
5.1
57
VDD1
LCD angle
-
3.3
58
VDD2
LCD angle
-
1.7
59
VSS
Ground
-
0
60
OSC
Oscillator terminal
-
3.9
8 TERMINALS DESCRIPTION
7
HONDA / CQ-EH8280A
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