Icom IC-7800 Service Manual Addendum page 219

Aug. 2008
SW-C BOARD
SW-C BOARD
3R3V
7.22V
OFF 3.30V
CLEAR 0.00V
MIN/MAX
DUAL WATCH 0.803V
8.19 3.31V
SPLIT 1.653V
S13
LS8J2M KI0
R13
2.2k
CLEAR
S15
LS8J2M
S14
LS8J2M
R14
SPLIT
4.7k
DUAL WATCH
KI0
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
S17
S16
LS8J2M
LS8J2M
STSK
MTSK
SUB TS
MAIN TS
S19
LS8J2M
S18
LS8J2M
SSPK
MSPK
SUB SPEECH
MAIN SPEECH
S21 S22 S20
LS8J2M LS8J2M LS8J2M
SLCK MLCK
MAIN LOCK
SUB LOCK SUB AUTO TUNE
MTSK,MSPK,MLCK,
SATK,STSK,SSPK,
SLCK
ON 0.00V
OFF 3.29V
Explanatory notes
VOLTAGE LINE
OFF 3.30V OFF 3.30V
MAIN FILTER 0.00V MAIN DIGISEL 0.00V
SUB FILTER 0.802V SUB DIGISEL 0.805V
MAIN PBT 1.667V MAIN APF/TPF 1.658V
SUB PBT 2.52V SUB APF/TPF 2.51V
3R3V
S1
S2
LS8J2M
LS8J2M
KI3
R1
R2
4.7k 2.2k
SUB FILTER MAIN FILTER
LDPS LDPS
DS51
DS52
SML-512MW SML-512MW
SPCD MPCD
S4 S3 3R3V
LS8J2M LS8J2M
KI3 KI3
KI2 KI2
KI1 KI1
KI0 KI0
R3
MTSK
SUB PBT CL
MPCD STSK
15k
SPCD MSPK
SSPK
MAIN PBT CL MLCK
SLCK
KI0
3R3V SATK
LDPS
GND
MPCD
DS54 SPCD
DS53
SML-512MW SML-512MW
MAPD MAPD
KI2 SAPD
SAPD MAPD MAUD
SAUD
MNCD
SNCD
LDPS
PITL
S6 S5
LS8J2M LS8J2M SAPL
SNCL
SP2B
SP2A
R6 R5
SP1B
SP1A
4.7k 2.2k
SAPD SAPD
SUB DIGI-SEL
MAIN DIGI-SEL
LDPS
DS55
SML-512MW
DS56
SML-512MW
MAUD
SAUD
SP1A
SP1B
S7 SP2A
LS8J2M
S8 SP2B
LS8J2M GND
GND
SNCL
R7
SAPL
MAUD PITL
15k
SUB APF/TPF
SAUD SAUD 3R3V
MAIN APF/TPF
LDPS 3R3V
DS58 DS57
SML-512MW SML-512MW
SNCD MNCD
KI1
S10 S9
LS8J2M LS8J2M
R10 R9
MNCD MNCD
4.7k
2.2k
SNCD SNCD
SUB NOTCH
MAIN NOTCH
S11
RIT
LS8J2M
R11
15k
OFF 3.30V
MAIN NOTCH 0.00V
S12 SUB NOTCH 0.799V
dTX
LS8J2M
RIT 1.657V
dTX 2.51V
62
PBT1 BOARD
PBT1 BOARD
turn left
3.3V
A,C A,C
0V
3.3V
B,D B,D
0V
S1
TP90D96E20
2 MP2A
A
3 MP2B
B
1
COM
MAIN TWIN PBT
5 MP1A
A
6 MP1B
B
4
COM
R1 RV-319
R2
4.7k
MAIN APF/NOTCH VR
R3
4.7k
MESUREMENT CONDITIONS
J1
voltage at RX
frequency : 14.1 MHz
mode : J3E(USB)
ANT(RX) : no input
Digital tester
Explanatory notes
range : input impedance
200mV : 100MΩ
2V : 11MΩ
VOLTAGE LINE
20V,200V,1000V : 10MΩ
to TENKEY
board J3
LED BOARD
J2
to PBT2
board J1
LED BOARD
MESUREMENT CONDITIONS
voltage at RX
frequency : 14.1 MHz
mode : J3E(USB) DS7 DS6
ANT(RX) : no input SML-A12WT SML-A12MT
Digital tester
range : input impedance
200mV : 100MΩ SUB LOCK
2V : 11MΩ
20V,200V,1000V : 10MΩ
SLCD
PBT2 BOARD
PBT2 BOARD
turn right
3.3V
A,C
0V
3.3V
B,D
0V
A
B
MP2A
SP2A
MP2B
SP2B
C
MP1A
MP1B
J1
J1
MP1A
D
MP1B SP1A
SP1B
MNCL MP2A
MP2B SP2A
GND SP2B
3R3V
to TENKEY
GND GND
to SW-C
board J4
GND GND
board J2
SNCL
MNCL
MAPL SAPL
3R3V PITL
3R3V
1.65V
3.30V
3.30V
MIN/MAX
1.65V
0.00 3.28V
MIN/MAX
0.00 3.28V
LDPS LDPS
DS4
CL-270WB
DS5 DS2
DS3
SML-A12UT SML-A12WT SML-A12MT
SUB RX SUB TX SPLIT MAIN LOCK MAIN RX
MRXD
MLCD
SPLD
STXD
SRXD
turn left turn right
3.3V 3.3V
A,C
0V 0V
3.3V 3.3V
B,D
0V 0V
B A
S1
TP90D96E20
SP2A
2
A
SP2B 3
B
1
COM
SUB TWIN PBT
SP1A SP1A 5
A
SP1B SP1B 6
B
4
COM
R1
C D
RV-319
R3
SNCL
4.7k
3R3V
SUB APF/NOTCH VR
R4
SAPL
4.7k
R2
RV-318
R5
CW PITCH VR
4.7k
MESUREMENT CONDITIONS
voltage at RX
frequency : 14.1 MHz
mode : J3E(USB)
ANT(RX) : no input
Digital tester
Explanatory notes
range : input impedance
200mV : 100MΩ
MIN/MAX
2V : 11MΩ
0.00 3.28V
VOLTAGE LINE
20V,200V,1000V : 10MΩ
LDPS
7.22V
MIN/MAX
8.19 3.31V
DS1
SML-A12UT
J1
LDPS
MAIN TX
MTXD
MRXD
MLCD
SPLD
to TENKEY
STXD
board J5
SRXD
SLCD
NC
GND