![background image](http://html.mh-extra.com/html/icom/ic-2800/ic-2800_service-manual_612060044.webp)
SECTION 11 VOLTAGE DIAGRAM
CONTROL UNIT
C36
10
+
L9
10
µ
H
IC7 TC7W14FU
1
2
3
4
5
6
7
8
C55
10
+
R3 100
R4 100
R5 100
R6 100
R7 100
R8 100
R9 100
R10 100
R11 100
R13 100
R12 100
C57
0.1
C31
0.1
L7
10
µ
H
C33
0.1
C34
10
+
C25
0.1
L8
2.7
µ
H
R15
470k
C23
0.001
R16
10k
L16
10
µ
H
IC2
TC75S51F
+
–
1
3
4
5
2
C26
560p
C27
0.1
R18
1M
R17
68k
C30
39p
R25
27k
R26
50k
R27
1k
C35
0.1
R20
68k
R21
22k
R22
47k
R24
4.7k
R23
2.2k
C28
0.1
C29
0.1
L10
10
µ
H
C92
470p
R106
560
R100
150k
R107
680
R109
10k
L13
10
µ
H
C52
0.1
C53
10
+
D1
1SS355
R14
27k
C24
120p
R290
1.5k
R110
150
R164
150
CP1
R292
3.3
D2
1SV282
R284
100
D12
MA8033 L
R112
10k
R287
10k
R288
15k
R285 10k
R286
15k
C56
270p
W11
W12
HPOS4
HPOS3
IC1
MN83951
SYNCIN
1
HDBIN
2
SIDE2
3
SIDE1
4
VDBIN
5
HOUT
6
VDO
7
BLK
8
VPOS 3
9
VPOS 2
10
VPOS 1
11
ZOOM
12
U/D
13
POL
14
INT/EXT
15
CPV
16
OEV3
17
OEV2
18
OEV1
19
STV
20
OEH
21
OH
22
STH
23
CPH4
24
CPH3
25
CPH6
26
CPH2
27
CPH5
28
CPH1
29
HALFSHIFT
30
CPHSEL
31
QHSEL
32
PD
33
6/3
34
VDD
35
VCOI
36
VCOO
37
VSS
38
RESET
39
HDOT1
40
UONS
41
42
43
44
45
PN1
46
VDD
47
VSS
48
C193
220p
C77
0.1
C78
10
+
C194
220p
C54
4.7
Q11
2SC4081 R
D14
MA8047 M
HPOS2
HPOS1
W4
R108
5.6k
STH1
OEH
Q2H
CPH1
CPH2
CPH3
GND
B
G
R
VB
RL
STH2
VEE
VCOM
VGH
VDD
STV2
OEV
CPV
STV1
VSS
U/D
VGL
LCD
DS1 EDTCA22QB0
C3
10
+
C2
0.1
C1
10
+
C4
0.1
C5
10
+
C6
0.1
C7
0.1
R2
4.7k
C8
10
+
C9
0.1
C10
10
+
C11
0.1
C12
47p
C13
47p
C14
47p
C15
47p
C16
47p
R1
4.7k
L1
10
µ
H
L2
10
µ
H
L3
10
µ
H
L5
10
µ
H
C17
47p
C18
47p
C19
47p
C20
47p
C21
47p
C22
47p
J1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
R278
47k
R280
47k
R279
47k
R31
100
R32
22k
Q4 2SC4081 R
R38
100
Q5 2SC4081 R
Q6
2SA1576 R
Q8
2SC4081 R
R41
22k
R42
100k
R35
82k
C75
0.1
C73
0.1
C74
10
+
R37
330k
R44
47k
Q3
2SA1576 R
Q7 2SA1576 R
C40
1
C41
1
R274
390
Q1
2SC4081 R
R40
100
D11
MA8030 H
L15
10
µ
H
L14
10
µ
H
C76
10
+
Q2 2SA1576 R
R39
22k
R275
47k
R277
47k
R276
47k
R
G
B
FPDAT0
FPDAT1
FPDAT2
FPDAT3
FPDAT4
FPDAT5
FPDAT6
FPDAT7
FPDAT8
C133
0.1
C134
0.1
C135
0.1
R241 10k
R238 10k
R239 10k
R240 10k
R259
10k
R235
390
C136
150p
R242 10k
R243 10k
R244 10k
R245
10k
R260
10k
R236
390
R246 10k
R247 10k
R248 10k
R261
10k
C189
220p
R60
100
R62
100
C152
0.1
R61
100
C151
0.1
C150
0.1
L4
10
µ
H
W14
W10
R249
10k
R237
390
C138
150p
C137
150p
+
R33
100
R34
22k
CONTV
BRITV
IC6 M52338FP
1
2
3
4
5
6
SW
7
8
9
VCC2
10
VEE
11
12
13
14
15
GND
16
17
18
19
20
21
22
BRIGHT
23
CONTRAST
24
GAM1
25
GAM2
26
EXT IN R
27
28
EXT IN G
29
30
EXT IN B
31
VCC1
32
IC16
M52042FP
: Other
M52045FP
: [EUR, ITA]
1
2
3
SYNC OUT
4
HD
5
6
7
8
CONT
9
10
11
12
GND
13
14
15
S.W.
16
17
18
TINT
19
COLOR
20
21
22
23
VCC
24
R84
2.7k
C81
0.01
R87
33k
R89
68k
C82
0.01
R65
33k
C86
0.1
C85
0.1
C84
0.1
C90
0.1
C87
0.01
R168
47k
R167
56k
R169
68k
C130
0.01
R170
39k
C58
0.1
R58
15k
R59
560 : Other
470 : [EUR], [ITA]
C59
470p
C141
1
C131
0.01
R51
1M
R258
47k
C44
4.7
+
R257
39k
D13
MA8043 L
C142
0.01
C45
0.01 : Other
0.068 : [EUR],
[ITA]
C132
0.01
C89
0.1
C91
0.1
R291 22
W6
C67
0.01
R273
2.7k
C83
0.01
C187
220p
R86
82k
C79
220p
C72
220p
C188
220p
C80
0.01
C191
220p
C71
0.01
C190
220p
C184
220p
C200
220p
C179
220p
C178
220p
C176
220p
C183
220p
C177
220p
C70
0.01
C199
220p
C196
220p
C186
220p
C181
220p
PA5
PA7
PA6
PA4
R173
470
R174
3.3k
R255
15k
R256
100k
D9
1SS355
R289
15k
R254
100k
C101
10
+
C102
10
+
R283
8.2k : Other
3.9k : [EUR], [ITA]
C154
180p : Other
100p : [EUR], [ITA]
X1
CR-640 : Other
CR-641: [EUR], [ITA]
C153
18p : Other
12p :[EUR], [ITA]
BIAS COUNT
COM OUT
COM GAIN
FRP2 IN
CP CONT
HD IN
CLAMP B
MAIN IN B
CLAMP G
MAIN IN G
CLAMP R
MAIN IN R
B OUT
SUB BIAS B
G OUT
SUB BIAS R
R OUT
FRP1 IN
SUB CONT R
SUB CONT B
C185
220p
R63
220
ACC FIL
SYNC IN
V IN
PED CAP
C TRAP
Y OUT
R OUT
G OUT
B OUT
KILLER FIL
VCXO OUT
VCXO MON
VCXO IN
APC FIL
KILLER OUT
PIX CONT
MD15
MD0
MD14
MD1
MD13
MD2
MD12
MD3
MD11
MD4
MD10
MD5
MD9
MD0
MD15
MD6
MD1
MD14
MD8
MD2
MD13
MD7
MD3
MD12
MD4
MD11
MD5
MD10
MD6
MD9
MD7
MD8
A17
A16
A15
A14
A13
MA8
A12
A11
MA7
A10
MA0
MA0
A9
MA6
MA1
MA8
A8
MA1
MA2
MA7
A7
MA5
MA3
MA6
A6
MA2
MA4
MA5
A5
MA4
A4
MA3
A3
A2
A1
A0
CS
A18
RD
WR
FPD
A
T
8
LRES
W
AIT
FPD
A
T
7
FPD
A
T
6
FPD
A
T
5
FPD
A
T
4
FPD
A
T
3
FPD
A
T
2
FPD
A
T
1
FPD
A
T
0
D7
D6
D5
D4
D3
D2
D1
D0
C107
0.01
IC8
SED1354F0A
AB2
1
AB1
2
AB0
3
CS#
4
M/R#
5
BS#
6
RD#
7
WE0#
8
WE1#
9
RD/WR#
10
RESET#
11
GPIO0
12
W
AIT#
13
IO
VDD
14
VS S
15
DB15
16
DB14
17
DB13
18
DB12
19
DB11
20
DB10
21
DB9
22
DB8
23
DB7
24
DB6
25
DB5
26
DB4
27
DB3
28
DB2
29
DB1
30
DB0
31
VSS
32
COREVDD
33
MA3
34
MA4
35
MA2
36
MA5
37
MA1
38
MA6
39
MA0
40
MA7
41
MA10
42
MA8
43
MA11
44
MA9
45
IOVDD
46
RAS#
47
WE#
48
UCAS#
49
LCAS#
50
VSS
51
MD7
52
MD8
53
MD6
54
MD9
55
MD5
56
MD10
57
MD4
58
MD11
59
MD3
60
MD12
61
MD2
62
MD13
63
MD1
64
MD14
65
MD0
66
MD15
67
VSS
68
FPFRAME
69
FPLINE
70
LCDPWR
71
DRD
Y
72
FPSHIFT
73
VSS
74
FPD
A
T
0
75
FPD
A
T
1
76
FPD
A
T
2
77
FPD
A
T
3
78
FPD
A
T
4
79
FPD
A
T
5
80
FPD
A
T
6
81
FPD
A
T
7
82
IO
VDD
83
D
A
CRD #
84
BLANK #
85
D
A
CCLK
86
VSS
87
FPD
A
T
8
88
FPD
A
T
9
89
FPD
A
T10
90
FPD
A
T11
91
FPD
A
T12
92
FPD
A
T13
93
FPD
A
T14
94
FPD
A
T15
95
VSS
96
COREVDD
97
DACP0
98
DACWR#
99
DACRS0
100
DACRS1
101
HRTC
102
VRTC
103
VSS
104
CLK
I
105
SUSPEND#
106
TESTEN
107
BUSCLK
108
VSS
109
IOVDD
110
AB20
111
AB19
112
AB18
113
AB17
114
AB16
115
AB15
116
AB14
117
AB13
118
AB12
119
AB11
120
AB10
121
AB9
122
AB8
123
AB7
124
AB6
125
AB5
126
AB4
127
AB3
128
R231
100k
JP1
C148
0.01
R271
56
D10
MA8030 H
IC19
TC7W04FU
1
2
3
4
5
6
7
8
IC9 LH61665AS-60A
VCC
1
I/O1
2
I/O2
3
I/O3
4
I/O4
5
I/O5
6
I/O6
7
I/O7
8
I/O8
9
NC
10
VCC
13
UW
14
LW
15
RAS
16
A0
17
A1
18
A2
19
A3
20
A4
21
VCC
22
VSS
23
A5
24
A6
25
A7
26
NC
27
NC
28
NC
29
OE
30
CAS
31
VSS
32
NC
35
I/O9
36
I/O10
37
I/O11
38
I/O12
39
I/O13
40
I/O14
41
I/O15
42
I/O16
43
VSS
44
IC22 TA78L05F
G
I
O
R233
100k
R232
100k
R217
15k
C103
0.01
C128
33
+
EP2
MMZ1608Y102BT
C157
0.22
C158
0.01
C159
0.01
R250 1M
X3
CSTCV26.25MXJ040
R178 100k
C104
0.01
R208
15k
R215
15k
R206
15k
R220
15k
VSYNC
HSYNC
JP2
D0
D1
D2
D3
D4
D5
D6
D7
LRES
CS
WR
RD
PB7
PA7
A0
PA6
A1
PA5
A2
PA4
A3
PA3
A4
PA2
A5
PA1
A6
PA0
A7
A8
A9
P80
A10
A11
A12
P77
A13
A14
P75
A15
P74
A16
P73
A17
P72
P71
P70
A18
WAIT
R131 1k
R127 1k
R128 470
R130 1k
R129 10k
R132 1k
R133 1k
R136 1k
R179
47k
R180
220k
R181
220k
R182
220k
R183
220k
R184
220k
R185
220k
R186
220k
R187
220k
R196
220k
R197
220k
R198
220k
R199
220k
R200
220k
R201
220k
R202
220k
R203
220k
R204
220k
R205
220k
IC11 S-80945ANMP-DD9
OUT
1
VDD
2
VSS
3
NC
4
CD
5
C143
12p
C105
0.01
R262
220k
R263
47k
R266
220k
R265
220k
R264
100k
R135 1k
R137 1k
R270
1k
C145
3p
C146
0.01
C147
0.01
X2
CR-566
C144
12p
C120
0.01
C119
0.01
JP3
IC21 TC74AC244F
ENA
1
A1
2
YB4
3
A2
4
YB3
5
A3
6
YB2
7
A4
8
YB1
9
VSS
10
VDD
20
ENB
19
YA1
18
B4
17
YA2
16
B3
15
YA3
14
B2
13
YA4
12
B1
11
IC20
TC7S08FU
1
2
3
4
5
IC10
HD6433032SK21F
PB0/TP8/TIOCA3
1
PA7/TP7/TIOCB2
80
P37/D7
20
VCC
21
P51/A17
40
P52/A18
41
P71/AN1
60
P72/AN2
61
PB1/TP9/TIOCB3
2
PB2/TP10/TIOCA4
3
PB3/TP11/TIOCB4
4
PB4/TP12/T
OCXA4
5
PB5/TP13/T
OCX B4
6
PB6/TP14
7
PB7/TP15/ADTRG
8
P90/TXD
9
P92/RXD
10
P94/SCK/IRQ4
11
VSS
12
P30/D0
13
P31/D1
14
P32/D2
15
P33/D3
16
P34/D4
17
P35/D5
18
P36/D6
19
P10/A0
22
P11/A1
23
P12/A2
24
P13/A3
25
P14/A4
26
P15/A5
27
P16/A6
28
P17/A7
29
VSS
30
P20/A8
31
P21/A9
32
P22/A10
33
P23/A11
34
P24/A12
35
P25/A13
36
P26/A14
37
P27/A15
38
P50/A16
39
P53/A19
42
P60/W
AIT
43
MD0
44
MD1
45
FAI
46
STBY
47
RES
48
NMI
49
VSS
50
EX T
A
L
51
52
VCC
53
P63/AS
54
P64/RD
55
P65/WR
56
RESO
57
A
VSS
58
P70/AN0
59
P73/AN3
62
P74/AN4
63
P75/AN5
64
P76/AN6
65
P77/AN7
66
VREF
67
AVCC
68
P80/IRQ0
69
P81/IRQ1
70
P82/IRQ2
71
P83/IRQ3
72
PA0/TP0/TCLKA
73
PA1/TP1/TCLKB
74
PA2/TP2/TIOCA0
75
PA3/TP3/TIOCB0
76
PA4/TP4/TIOCA1
77
PA5/TP5/TIOCB1
78
PA6/TP6/TIOCA2
79
R140 1k
R141 1k
R142 1k
R143 1k
R175 1k
R176 1k
R268 47k
R269 47k
R267
220k
R299
1k
R300
1.5k
R134
1k
R177 47k
R272
10k
XT AL
R188 220k
R189 220k
R190 220k
R191 220k
R192 220k
R193 220k
R194 220k
R195 220k
HV
TDATA
RDATA
GND
SP
SPE
SP
SPE
IC14 TA78L05F
G
I
O
C114
10
+
R163
10k
C117
47p
C118
47p
J2
1
2
3
4
5
6
Q18
2SB1132 R
W13
R293
4.7
C113
0.001
J5
1
2
C112
0.001
R158
10k
Q12
2SC4081 R
R159
4.7k
R160
4.7k
C169
220p
C115
10
+
C164
220p
C165
220p
C168
220p
C166
220p
C160
0.1
C116
0.001
TO
MAIN UNIT
J3
1
2
SP1
VS-57-0814
C167
220p
UDIAL
ENCODER
UVOL
USQL
VVOL
VSQL
POWER
F-1
F-2
F-3
F-4
F-5
F-6
F-7
F-8
CHANGE
PA2
P73
P72
PA3
P74
P75
P80
P77
P71
P70
PA0
PA1
R152
47k
R155
47k
C109
0.0047
C110
47p
R113
2.2k
R114
4.7k
R115
15k
R117
2.2k
C98
0.0047
R126
47k
R124
47k
R125
47k
W8
R120
6.8k
R116
6.8k
S12
A
1
B
2
NC
3
COM
4
S11
A
1
B
2
NC
3
COM 4
R145
10k
R148
10k
R151
10k
R154
10k
R157
100k
R162
4.7k
R161
15k
R298
10k
Q13
2SA1576 R
C108
0.0047
R122
47k
C111
47p
C97
0.0047
R146
47k
R149
47k
C95
47p
C174
220p
R119
15k
R118
4.7k
R121
47k
C94
47p
C96
0.0047
C175
220p
R123
47k
C172
220p
C197
220p
C99
0.0047
C195
220p
C173
220p
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
EXT V
E
CFL+
CFL–
NC
NC
J3
1
2
3
4
J4
VIDEO
IN
1
2
3
4
CFL
DS2 HMBS 3 A1W 83N/AZ Assy
S11
EVQ-VENF01
VDIAL
ENCODER
S12
EVQ-VENF01
C123
33
+
IC17 TA78L05F
G
I
O
R165
8.2k
C122
33P
C155
10
+
C121
0.033
L18
SLF6028T-101MR42
C129
0.001
IC23 TA78L05F
C156
0.1
C127
0.001
C149
10
+
R294
2.7k
Q20
2SA1362 GR
L19
678XN-1369
C192
220p
Q14
2SC3647 S
Q15
2SC3647 S
Q19
DTC144EU
G
I
O
R295
4.7k
IC3 M5291FP
CS
1
ES
2
CT
3
GND
4
INVIN
5
V+
6
SI
7
CD
8
C125
47
+
IC15
TA79L15F
G
I
O
C126
0.001
L11
SLF7032T-681MR16-2
D3
SB10-05PCP
C38
47
+
R30
470k
R29
33k
C39
8.2
+
Q16
2SA1362 GR
R282
2.7k
R281 4.7k
C124
0.001
R296
2.2k
R297
680
Q17
DTC144EU
Q21
2SB798 DK
C201
2.2
C37
0.001
R302
8.2
R28
1
R301
8.2
5.11
12.94
5.22
6.56
12.46
12.34
–15.8
–16.9
–16.0
13.01
12.08
0.6
12.5
12.6
12.6
–0.36
–0.36
13.06
12.39
5.2
5.13
5.16
–14.7
5.22
1.81
3.15
1.72
1.71
5.11
4.88
3.26
2.62
–3.1
0.86
–14.5
5.05
1.4
0.34
0.9
5.13
5.21
13.0
4.67
–8
–8
–14.5
–7.5
–14.7
4.26
5.22
5.21
0.15
11 - 1