Icom Ic-2800 Dual Band Fm Tranciever Service Manual

7 - 2
MP6 (CO)
MP1 (CO)
MP28 (CO) MP28 (CO)MP27 (CO)
MP11 (CO)MP3 (CO) MP2 (CO)
MP22 (CO)
MP5 (CO) MP6 (CO) MP5 (CO)
Note(M)      :  MAIN unit
(CO)    :  CONTROL unit
(C)       :  CHASSIS
MP12 (CO)
MP4 (C)
MP4 (C)
MP3 (C)MP4 (C)
MP6 (C)MP4 (C)
MP3 (C)
MP4 (C) MP3 (C) MP5 (C)MP4 (C)
MP13 (CO)
MP18 (CO) DS1 (CO)MP14 (CO)MP15 (CO)
MP13 (CO)DS2 (CO)MP24 (CO)
MP25 (CO)MP17 (CO)MP21 (CO)MP7 (CO)
MP23 (CO)MP20 (CO)
WS1 (CO)MP30 (CO)MP19 (CO)
MP19 (CO)MP10 (CO)
MP17 (CO)
MP16 (CO)
MP3 (C)MP13 (C)
W4 (M)
MP2 (M)...

SECTION PARTS LISTSECTION 8 SEMI-CONDUCTOR INFORMATION
8 - 1  TRANSISTORS
NAME 
SYMBOL
INSIDE VIEW NAME 
SYMBOL
INSIDE VIEW
2SB1201-S 2M
2SB934P- B934
BC
E BC C
E
2SC3324-GR CBG
2SC4081 R BR
2SC4116-BL LBL
2SC4213-B AB
2SC4215-O OY
2SC4226 R25
2SC4228 R45
2SC5085-Y MCY
2SC5193-T1 T88
BEC
2SA1362-GR AEG
2SA1576A R FA
C
BE
DTA144EUA 16
DTB123EK F12
BEC
DTC114EUA 24
DTC143-XU 43
DTC143-ZUA 123
BEC
2SC2954-T2B QK
2SC3357-T2 RK
2SC3647S-TD CC
2SD999-T2 CK CK
CE C
B
2SB1132 T100 R BAR
2SB798-T2 DK DK
BEC
C...

9 - 1
9 - 1  CONTROL UNIT
• TOP VIEW
MP24
HV
TDATA
RDATA
GND
SP
SPE
CFL+
NC
NC
CFL–
J3
CFL+ NC NCCFL–
J3
from CFL BACK LIGHT
EXT. VIDEO INUVOL
USQL
UDIAL VVOL
VSQL
VDIAL12 34 56
12 34 56 J2
to MAIN UNIT J3J2
1
2
3
4A
B
NC
COM
4
3
2
1 COM
NC
B
A
The combination of this page and the next page shows
the unit layout in the same configuration as the actual
P.C. Board.  
SECTION 9 BOARD LAYOUTS 

9 - 2
The combination of this page and the previous page
shows the unit layout in the same configuration as the
actual P.C. Board.  
• BOTTOM VIEWCONTROL UNITHV
TDATA
RDATA
GND
SP
SPE
CFL+NC
NC CFL–
J3
CFL+ NC NC CFL– J3
from CFL BACK LIGHT
(DS2)
EXT. 
VIDEO IN
J4UVOL
R145
USQL
R148
UDIAL
S11VVOL
R151
VSQL
R154
VDIAL
S12 1 23 45 6
1 23 45 6J2
to MAIN UNIT J3J2
1
2
3
4A
B
NC
COM
4
3
2
1 COM
NC
B
A
1 4 R151
R154
R145
J4
R148
S11
VGL
VSS
STV1
U/D
CPV
OEV
STV2
VDD
VGH
VCOM
VEE
STH2
RL
VB
R
G
B
GND
CPH3
CPH2...

9 - 3
• TOP VIEWMAIN UNIT
42
1
3 5
6
J7   DATA I/O4
213 5
6
PSQLAFOUT
DATAOUT
DATAINPTTP
GND
HV RDATA SPTDATA GND SPE65
43
21J3       to CONTROL UNIT J2
6
754
32
1
8EXT MIC INPUT
STD
Q4
Q3
Q2
Q1
TOE
C5V
DETO
GND
OPD
1 10E
FV
1 2
J4
MDATA  E  MIC  MICE  PTT  EXTMIC  MU/D  M8V
M
from FAN MOTOR
MF1
ANTENNA EXT SP CLONE I/O
W4HV IN
J6      to OPTIONAL UNIT
J5
The combination of this page and the next page shows
the unit layout in the same configuration as the actual
P.C. Board.   

9 - 4
4 2
1
35
6
J7    DATA I/O4
2
1 35
6
PSQL AFOUT
DATAOUT
DATAINPTTP
GND
HV RDATA SP TDATAGND SPE6 5
4 3
2 1
from CONTROL UNIT
6
7 5 4
3 2
1
8
EXT MIC INPUT
M8V  MU/D  EXTMIC  PTT  MICE  MIC  E  MDATA
from EXT SP
J1CLONE I/O
J2
MAIN UNIT
• BOTTOM VIEW
The combination of this page and the previous page
shows the unit layout in the same configuration as the
actual P.C. Board.   

2SC4081
MA8075
X4
SMD-49V BIAS SEL
Q34 UMG9N 1/2
Q35 DTB123EK
INITIAL MATRIXOSC1
OSC2
EEPROM
IC17  X25320SI
ESO POWER SW CTRL
Q74  DTC143XU
Q75  2SB1201
MICIN
CPIC1HDHD
MU/D
PROTECTER
D61  MA8062  
MIC M D ATA
MICE
EXTMIC
MIC SENS. CTRL
IC25  TC7S66FU
D66  1SS355 D44 Q76
Q778V REG
IC14  TA7808F
2SB1132
U BIAS SEL
Q34  UMG9N  1/2
Q36  DTB123EK
RES
ESI,ECS,
ESCK
1RX
4RX
PCTRL
FANC
IS0, IS1, IS2
II0, II1, II2, II3MIC MUTE
9600 bps SW
IC26  BU4066BCFV
Q93   DTC144EU
PTTM
R D ATA
GND
SP
SPE
MU/DEXTMIC
VT8V...

X4
SMD-49V BIAS SEL
Q34 UMG9N 1/2
Q35 DTB123EK
INITIAL MATRIXOSC1
OSC2
EEPROM
IC17  X25320SI
ESO POWER SW CTRL
Q74  DTC143XU
Q75  2SB1201PROTECTER
D45  DSA3A1
D46  RD20E
UUNLK MICIN
VAMUTE UAMUTE
CPU
IC19
HD6433876NB 10H
 [USA]HD6433876NB 11H
PLL5V
Q13  DTC144EU
Q14  DTB123EK
MU/D
PROTECTER
D61  MA8062  9600 bps AMP
IC27B  NJM4558M 1/2LPF
IC23A  NJM4558M 1/2  
MIC SENS. CTRL
IC25  TC7S66FU
D66  1SS355V_SHIFT
Q3  DTC144E
UD2  MA77 8V REG
IC14  TA7808F
U BIAS SEL
Q34  UMG9N  1/2
Q36  DTB123EK
RES
ESI,ECS,...

CRYSTAL FIL
FI1  FL-288V_APC DET
D7, D8  RB706F ´ 2 
U_APC DET
D25, D26
RB706F ´ 2 
U_LOOP FIL
Q101  2SC3324
Q102  2SK880HI/LOW CTRL
IC5  TA75S01F
AF AMP 
IC12 LA4445 U_AF FIL
Q85, Q86
 2SC4081 ´ 2 
COM_MUTE
IC11 TC4S81F
Q69 2SC4213U_MUTE
Q71  2SC4213
DTMF DEC UNIT
(UT-49)
   OPTION X1
CR-549
15.2 MHzUATT VAT TV_PA
IC1  M67746
NOISE
FIL
V_IF5V
D40  MA8047
X2
CDB450C24
SW
IC6B
IC7A
TC4W66F 1/2  15.65 MHzV_MIX
Q15  3SK166
PLL
IC2
M64076AGP V_SHIFT
Q3  DTC144EU
D2  MA77
LVO1
LVO2
LVO3
LVO4
NOISE FIL
CERAMIC...

CRYSTAL FIL
FI1  FL-288V_APC DET
D7, D8  RB706F ´ 2 
U_APC DET
D25, D26
RB706F ´ 2 
U_LOOP FIL
Q101  2SC3324
Q102  2SK880 2SC4081
MA8075
X4
SMD-49V BIAS SEL
Q34 UMG9N 1/2
Q35 DTB123EK
HI/LOW CTRL
IC5  TA75S01F
INITIAL MATRIXOSC1
OSC2
EEPROM
IC17  X25320SI
ESO POWER SW CTRL
Q74  DTC143XU
Q75  2SB1201
AF AMP 
IC12 LA4445 U_AF FIL
Q85, Q86
 2SC4081 ´ 2 
COM_MUTE
IC11 TC4S81F
Q69 2SC4213U_MUTE
Q71  2SC4213
DTMF DEC UNIT
(UT-49)
   OPTION PROTECTER
D45  DSA3A1
D46  RD20E
X1
CR-549
15.2 MHz
UUNLK MICIN
VAMUTE...