Panasonic CQ-EH2280A Service Manual ▷ View online
6 BLOCK DIAGRAM (Main, Display, Tape Block)
5
HONDA / CQ-EH2280A
7 BLOCK DIAGRAM (CD Servo Block)
6
HONDA / CQ-EH2280A
8.1. Main Block
IC601 : C2CBHG000106
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 B
Rotary encoder data
I
0.5
7
VOL A
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
(Ground pull-down)
-
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-SEC2
(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
(Vdd pull-up)
-
4.9
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 control
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
(Vdd pull-up)
-
4.9
60
ILL-IN
Illumi. level check
-
4.0
61
NAVI-IN
(Vdd pull-up)
-
4.8
62
NC
No connection
-
-
63
NAVI-MUTE-
L
L
No connection
-
-
64
NAVI-MUTE-
R
R
No connection
-
-
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 switch
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
REMOTE
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
ILL-
Illumi. detection
I
-
89
TAPE EJ
Tape eject SW
I
4.6
90
GA-IN
(+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
RXD
Not used
-
0
96
TXD
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
LCD DIM
LCD data
O
4.9
100
CD-RESET
CD.C reset
O
4.9
Note :
Voltage measuerments are with respect to ground, with a
voltmeter (Internal resistance : 10M ohms.)
voltmeter (Internal resistance : 10M ohms.)
8 TERMINALS DESCRIPTION
7
HONDA / CQ-EH2280A
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 connection
-
-
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-in 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
61
DO
Key data output
O
4.1
62
CE
LCD driver chip enable
I
0
63
CLK
Shift clock for LCD data
I
0
64
DI
LCD data input
I
0
8.3. CD Servo Block
IC201 : MN662785TBUC
Pin
No.
No.
Port
Descriptions
I/O
Vol
(V)
(V)
1
DVDD3
+3V power supply
-
3.6
2
D0
D-RAM data
I/O
2.0
3
D1
D-RAM data
I/O
2.0
4
NWE
D-RAM data write
O
3.0
5
NRAS
D-RAM row address strobe
O
3.2
6
D2
D-RAM data
I/O
2.1
7
D3
D-RAM data
I/O
1.9
8
NCAS0
D-RAM column address strobe
O
2.8
9
NCAS1
D-RAM column address strobe
O
1.4
10
A8
D-RAM address
O
1.0
11-14 A7-4
D-RAM address
O
1.1
15
A9
D-RAM address
O
1.1
16-18 A0-A2
D-RAM address
O
1.1
19
A3
D-RAM address
O
1.1
20
DVSS
Ground
-
0
21
DVDD2
+3V power supply
-
3.6
22
SPOUT
Not used
-
1.5
23
TRVP
Traverse motor control
O
1.9
24
TRVM
Traverse motor control
O
1.9
25
TRP
Tracking coil drive
O
1.9
26
TRM
Tracking coil drive
O
1.9
27
FOP
Focus coil drive
O
2.0
28
FOM
Focus coil drive
O
2.0
29
FBAL
Focus balance
O
1.9
30
TBAL
Tracking balance
O
1.9
31
CSEL
(Connecting to P3V)
-
3.6
32
FE
Focus error
I
2.0
33
TE
Tracking error
I
1.9
34
RFENV
RF envelope
I
1.9
35
OFT
Off track signal
I
0
36
NRFDET
RF detecting signal
I
0
37
BDO
Drop-out signal
I
0
38
LDON
Laser on signal
O
3.6
39
ARF
RF signal
I
1.9
40
IREF
Reference current input
I
1.2
41
ADPVCC
(Connecting to ground)
-
0
42
DSLF
Loop filter for DSL
-
2.0
43
DRF
Loop filter for DSL
-
2.2
44
PLLF
Loop filter for PLL
-
1.3
45
VCOF
VCO filter
-
1.3
46
AVDD2
+3V power supply
-
3.6
47
AVSS2
Ground
-
0
48
OUTL
L channel output
O
1.8
49
AVSS1
Ground
-
0
50
OUTR
R channel output
O
1.8
51
AVDD1
+3V power supply
-
3.5
52
FSEL
(Connecting to P3V)
-
3.7
53,54 -
(Connecting to ground)
-
0
55
FLAG
Flag output
O
0
56
CLVS
Servo status signal
O
3.6
57-59 -
Not used
-
-
60
TX
Text date
-
-
61
MCLK
Clock for I/F command
I
2.4
62
MDATA
Date for I/F command
I
1.9
63
MLD
I/F command load
I
3.5
64
BLKCK
Subcode block clock
O
0
65
SQCK
Ext.clock for sub code-Q
I
3.5
66
SUBQ
Sub code-Q
O
1.1
67
DMUTE
Mute input
I
0
68
STAT
Status signal
O
1.1
69
NRST
Reset input
I
3.6
70
SPPOL
Not used
-
-
71
PMCK
Clock output
O
2.0
72
SMCK
Clock output
O
1.9
73
SDATA
Serial data
O
0
74
LRCK
LR clock
O
0
75
BCLK
Bit clock
O
0
76
/TEST
(Connecting to P3V)
-
1.5
77
X1
Crystal oscillator
-
1.8
8
HONDA / CQ-EH2280A
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