Sw-A Board; Vr-B Board; Vr-C Board; Vr-A Board - Icom IC-7800 Service Manual Addendum

11-3 SW-A BOARD

SW-A BOARD
OFF 3.30V
Explanatory notes
TUNER SW 0.000V
VOLTAGE LINE
TIMER SW 0.807V
VOX BK-IN SW 1.662V
MONI SW 2.52V
MESUREMENT CONDITIONS
voltage at RX
frequency : 14.1 MHz
mode : J3E(USB)
DS5 SML-512DW
ANT(RX) : no input
STBY LED
Digital tester
STBD R2
range : input impedance
470
200mV : 100MΩ DS6 SML-512MW
PWRD
2V : 11MΩ POWER ON LED
20V,200V,1000V : 10MΩ PWRK
S1 LS8J2M
ON : 0.0V
OFF : 3.29V
POWER SW
3.30V
VOXD VOXD
J1
R14
3R3V
TRAK
NC
4.7k
MIGL S2 LS8J2M
PWRL
MAGL
to VR-B TRANSMIT SW
MSQL
board J1
GND
GND
GND
GND MOND MOND
R3
680
TN1D DS15 SML-512UW
TUNING LED
R4
470
TN2D DS16 SML-512MW
TUNER LED
KI11
S3 LS8J2M
TUNER SW
TMD TMD
DS7 SML-512MW
TIMER LED
R13
KI11
S4 LS8J2M
2.2k
TIMER SW
LDPS
J2
3R3V
NC
KYSL
DS8 SML-512MW DS9 SML-512MW
DELL
SAGL
S6 LS8J2M S5 LS8J2M
to VR-C
SSQL
board J1
GND
GND
GND
GND
MAIN MAIN
AGCVR SW NR SW
R15
2.2k
KI9
3R3V
OFF 3.30V
MAIN AGCVR SW 0.000V
MAIN NR SW 0.788V
MAIN NB SW 1.664V

11-4 VR-B BOARD

VR-B BOARD
R1
3.31V
RV-317
R3
4.7k
R4
MIC/PWR VR
4.7k
MIN/MAX
0.0V/3.29V
Explanatory notes
VOLTAGE LINE
J1
R2 3R3V
RV-317
NC
R5
MIGL
PWRL
4.7k
MAGL
to SW-A
MAIN AGC/SQL VR MSQL board J1
R6
GND
GND
4.7k
MESUREMENT CONDITIONS GND
voltage at RX GND
frequency : 14.1 MHz
mode : J3E(USB)
ANT(RX) : no input
Digital tester
range : input impedance
200mV : 100MΩ
2V : 11MΩ
20V,200V,1000V : 10MΩ
7.22V
OFF 3.30V
OFF 3.30V A 0.000V
E 0.000V B 0.807V MIN/MAX
8.21 3.31V
F 0.799V C 1.663V
G 1.657V D 2.52V
LDPS LDPS
S14 LS8J2M
A
LDPS
S15 LS8J2M
B
R12
DS12 LDPS
SML-512MW S16 LS8J2M
470
S11 LS8J2M
C
VOX BK-IN SW
S17 LS8J2M
R30
LDPS D KI7
KI8
DS17 SML-512MW 470
KI9
S21 LS8J2M KI10
KI11
KI7
MONI SW
S18 LS8J2M
E
3R3V
S19 LS8J2M
F
S20 LS8J2M
G
LDPS LDPS
DS11 DS13 DS14
DS10 SML-512MW
SML-512MW SML-512MW SML-512MW
S7 LS8J2M S8 LS8J2M S12 LS8J2M S13 LS8J2M
MAIN SUB SUB
SUB
NB SW AGCVR SW NR SW NB SW
R16 R17 R18
4.7k 2.2k 4.7k
3R3V 3R3V
OFF 3.29V
MAIN AGCVR SW 0.00V
MAIN NR SW 0.791V
MAIN NB SW 1.648V

11-5 VR-C BOARD

VR-C BOARD
R1
RV-317 3.31V
R3
4.7k
KEY/DELAY VR
R4
4.7k
Explanatory notes
VOLTAGE LINE
R2
RV-317
R5
4.7k
SUB AGC/SQL VR
R6
MESUREMENT CONDITIONS 4.7k
voltage at RX
frequency : 14.1 MHz
mode : J3E(USB)
ANT(RX) : no input
Digital tester
range : input impedance
200mV : 100MΩ
2V : 11MΩ
20V,200V,1000V : 10MΩ
11 - 2

11-6 VR-A BOARD

VR-A BOARD
J4
EP20
MICI
M8V EP19
MUD EP18
SQLS EP17
MSND EP16
to MIC
GND EP15
board J2
GND EP14
EP13
MICE
GND EP12
EP10
AFO
EP11
J3
EP21
GND
GND
NC
LDPS J2
STBD
MICI
PWRD MICE
VOXD
PHOS
TN1D
PHE
to MAIN
TN2D
unit J440 PHOM
TMD
PHE
MAGD
AFO
MNRD
AFE
MNBD
SAGD
SNRD
SNBD
TRAK
PWRK J3
MOND
PHE
NC PHOM
to DISPLAY
NC PHE
board J3
NC
PHOS
NC PHE
to JACK
NC
PHI EP5
board J1
KI7 GND R27
KI8 0 EP3
DASH
KI9 DOT EP2
KI10 GND
KI11
R28
KYSL
0
DELL
SAGL
SSQL
MIGL
PWRL
MAGL
MSQL MESUREMENT CONDITIONS
3R3V voltage at RX
frequency : 14.1 MHz
GND
mode : J3E(USB)
GND
Explanatory notes
ANT(RX) : no input
Digital tester
VOLTAGE LINE
range : input impedance
200mV : 100MΩ
TX LINE
2V : 11MΩ
20V,200V,1000V : 10MΩ RX LINE

11-7 MIC BOARD

C8
47p
0.0047
EP10
J1
1 EP11
7 EP4
1 7 2 M8V EP5
AFO EP9
8
6 GND EP7
2 8 6
3 EP2
4 EP3
5 MSND EP6
3 5
4
EP8
MESUREMENT CONDITIONS
voltage at RX
frequency : 14.1 MHz
mode : J3E(USB)
ANT(RX) : no input
Digital tester
range : input impedance
200mV : 100MΩ
2V : 11MΩ
20V,200V,1000V : 10MΩ

11-8 JACK BOARD

J2
PHONE-J
R1 10
R2 10
PHI
MIN/MAX
0.0V/3.29V
J1
Explanatory notes
3R3V
NC RX LINE
KYSL
DELL
SAGL
to SW-A
SSQL
board J2
GND
GND
J102 EP101
GND
GND
ELEC-KEY-J
EP102
J1
NC
3.31V NC
MIN/MAX
GND
0.0V/3.29V
NC
3R3V 3R3V
MNBL MNBL
MNRL MNRL
SNBL SNBL
SNRL SNRL
MRFL MRFL
MAFL MAFL
SRFL SRFL
SAFL SAFL
NC to DISPLAY
NC
board J6
MUD MUDL
R21 0
NC
DOT R22 0 DOTK
DASH R23 0 DSHK
NC
R24 0
PHI PHNI
SQLS R25 0 SQLS
NC
NC
NC
NC
NC
NC
MSND MSND
M8V M8V
R1
3R3V
RV-308
R11
MNBL
4.7k
MAIN NB
MNRL
R12
MAIN NR
4.7k
R2
RV-308
R13
SNBL
4.7k
SUB NB
SNRL
R14
SUB NR
4.7k
R3
RV-308
R15
MRFL
MAFL MAIN RF
4.7k
MAIN AF
R16
4.7k
R4
RV-308
R17
SRFL
SAFL
4.7k
SUB RF
R18
SUB AF
4.7k

11-10 SW-B BOARD

MIC BOARD
C1
3.30V
J2
L1 100µ MICI
M8V
MUD
L2 100µ
L3 100µ SQLS
MSND
to VR-A
GND
board J4
L4 HF50ACC322513 GND
MICE
GND
AFO
to DISPLAY
Explanatory notes
board J4
VOLTAGE LINE
TX LINE
JACK BOARD
J1
L1 HF50ACC322513 L4 100µ PHE
L2 HF50ACC322513 L5 100µ PHOM
PHE
L3 HF50ACC322513 L6 100µ PHOS
PHE
to VR-A
PHI
board J3
GND
DASH
DOT
GND
3.30V
DASH
MESUREMENT CONDITIONS
voltage at RX
DOT
frequency : 14.1 MHz
GND
mode : J3E(USB)
ANT(RX) : no input
Digital tester
range : input impedance
200mV : 100MΩ
2V : 11MΩ
20V,200V,1000V : 10MΩ

11-9 VR-D BOARD

VR-D BOARD
3.30V
3R3V 3R3V
BRIGHT
R1
RK097111T005A
MESUREMENT CONDITIONS
voltage at RX
frequency : 14.1 MHz
CONTRAST
mode : J3E(USB)
ANT(RX) : no input
R2
Digital tester
RK097111T005A
range : input impedance MIN/MAX
200mV : 100MΩ 0.0V/3.30V
2V : 11MΩ
ANTI VOX
20V,200V,1000V : 10MΩ
R3
RK097111T005A J1
3R3V
R11 4.7k BRIL
VOX GAIN
R12 4.7k CNTL
R4 R13 4.7k AVXL
RK097111T005A R14 4.7k VOXL
to DISPLAY
R15 4.7k DRVL board J5
R16 4.7k CMPL
DRIVE
R17 4.7k MONL
R5 GND
RK097111T005A GND
COMP
R6
RK097111T005A
MONI GAIN
Explanatory notes
R7
RK097111T005A
VOLTAGE LINE
SW-B BOARD
J1
F1K
F2K
F3K
F4K
F5K
F6K SSBK F1K
F7K S8 LS8J2M S1 LS8J2M
SSBK
CWK
SSB F-1
RTYK
AMK
DATK
MSCK
EXTK CWK F2K
S2 LS8J2M
RECK S9 LS8J2M
PLYK
MATK
CW
F-2
GND
RTYK F3K
F1K,F2K,F3K,
S10 LS8J2M S3 LS8J2M
F4K,F5K,F6K,
F7K,SSBK,CWK,
F-3
RTTY/PSK
RTYK,AMK,DATK,
MSCK,EXTK,RECK,
PLYK,MATK
ON 0.00V AMK F4K
S11 LS8J2M S4 LS8J2M
OFF 3.28V
AM/FM
F-4
RECK DATK F5K
S15 LS8J2M S12 LS8J2M S5 LS8J2M
REC
DATA F-5
PLYK MSCK F6K
S16 LS8J2M S13 LS8J2M S6 LS8J2M
M.SCOPE F-6
PLAY
MATK EXTK F7K
S14 LS8J2M
S17 LS8J2M S7 LS8J2M
F-7
MESUREMENT CONDITIONS EXIT/SET
voltage at RX
frequency : 14.1 MHz
mode : J3E(USB)
ANT(RX) : no input
Digital tester AUTO TUNE MAIN
range : input impedance
200mV : 100MΩ
2V : 11MΩ
20V,200V,1000V : 10MΩ