Sw-C Board; Pbt1 Board; Pbt2 Board; Led Board - Icom IC-7800 Service Manual Addendum

11-12 SW-C BOARD

SW-C BOARD
3R3V
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
SUB LOCK MAIN 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
MAIN FILTER 0.00V MAIN DIGISEL
SUB FILTER 0.802V SUB DIGISEL
MAIN PBT 1.667V MAIN APF/TPF
SUB PBT 2.52V SUB APF/TPF
S1
S2
LS8J2M
7.22V LS8J2M
KI3
R1
R2
4.7k 2.2k
SUB FILTER MAIN FILTER
LDPS LDPS
DS51
DS52
SML-512MW
SML-512MW
SPCD MPCD
S4
S3
LS8J2M
LS8J2M KI3
KI2
KI1
KI0
R3
SUB PBT CL
MPCD
15k
SPCD
MAIN PBT CL
KI0
3R3V
LDPS
DS54
DS53
SML-512MW SML-512MW
MAPD
KI2
SAPD MAPD
S6
S5
LS8J2M LS8J2M
R5
R6
4.7k 2.2k
SAPD SAPD
SUB DIGI-SEL
MAIN DIGI-SEL
LDPS
DS55
SML-512MW
DS56
SML-512MW
MAUD
SAUD
S7
LS8J2M
S8
LS8J2M
R7
MAUD
15k
SUB APF/TPF
SAUD SAUD
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
SUB NOTCH 0.799V
S12
dTX
LS8J2M
RIT 1.657V
dTX 2.51V
11 - 4

11-13 PBT1 BOARD

PBT1 BOARD
3.30V
0.00V turn left
0.805V
3.3V
1.658V A,C
0V
2.51V
3.3V
B,D
3R3V
0V
S1
TP90D96E20
COM
MAIN TWIN PBT
COM
R1
MAIN APF/NOTCH VR
MESUREMENT CONDITIONS
J1
voltage at RX
3R3V frequency : 14.1 MHz
KI3
mode : J3E(USB)
KI2
ANT(RX) : no input
KI1
Digital tester
KI0
range : input impedance
MTSK
200mV : 100MΩ
STSK
2V : 11MΩ
MSPK
20V,200V,1000V : 10MΩ
SSPK
MLCK
SLCK
SATK
GND
MPCD to TENKEY
SPCD
board J3
MAPD
SAPD
MAUD
SAUD
MNCD
SNCD
LDPS
PITL
SAPL
SNCL
SP2B
SP2A
SP1B
SP1A

11-15 LED BOARD

J2
SP1A
SP1B
SP2A
SP2B
GND
to PBT2
GND
board J1
SNCL
SAPL
LED BOARD
PITL
3R3V
MESUREMENT CONDITIONS
voltage at RX
frequency : 14.1 MHz
mode : J3E(USB) DS7
ANT(RX) : no input SML-A12WT
Digital tester
range : input impedance
200mV : 100MΩ
2V : 11MΩ
20V,200V,1000V : 10MΩ

11-14 PBT2 BOARD

turn right
3.3V
A,C
0V
3.3V
B,D
0V
A
B
MP2A MP2A
2
A
3 MP2B MP2B
B
1
C
5 MP1A MP1A
A
MP1B MP1B
6
B
4
J1
MP1A
D
RV-319
MP1B
R2
MNCL MP2A
MP2B
4.7k
3R3V GND
to TENKEY
GND
to SW-C
board J4
R3
GND
board J2
MNCL
4.7k
MAPL
3R3V
1.65V
Explanatory notes
3.30V
VOLTAGE LINE
MIN/MAX
0.00 3.28V
LDPS LDPS
DS4
CL-270WB
DS6 DS5 DS3
SML-A12MT SML-A12UT SML-A12WT
SUB LOCK SUB RX SUB TX SPLIT
MLCD
SPLD
STXD
SRXD
SLCD
PBT2 BOARD
turn left turn right
3.3V 3.3V
A,C A,C
0V 0V
3.3V 3.3V
B,D B,D
0V 0V
B A
S1
TP90D96E20
SP2A SP2A 2
A
SP2B SP2B 3
B
1
COM
SUB TWIN PBT
SP1A SP1A
5
A
SP1B SP1B 6
B
4
COM
J1
SP1A R1
C D
SP1B RV-319
R3
SP2A SNCL
SP2B
4.7k
GND 3R3V
SUB APF/NOTCH VR
GND
R4
SNCL
SAPL SAPL
4.7k
PITL
3R3V
R2
RV-318
R5
CW PITCH VR
3.30V
4.7k
1.65V
MESUREMENT CONDITIONS
voltage at RX
frequency : 14.1 MHz
MIN/MAX
mode : J3E(USB)
0.00 3.28V
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
DS2
DS1
SML-A12MT SML-A12UT
J1
LDPS
MAIN LOCK MAIN RX MAIN TX
MTXD
MRXD MRXD
MLCD
SPLD
STXD
SRXD
SLCD
NC
GND
to TENKEY
board J5