Main Unit - Icom IC-78 Service Manualvice Man

SECTION 9 BOARD LAYOUTS

9-1 MAIN UNIT

• TOP VIEW
to FILTER unit J3
to PA unit J6
WS1
to FILTER unit J1
P2
10
9
T13V
GND
REF
L3
W7 W6
FOR
L5
1st LO
L4
L2
from PLL unit
L1
L6 J4
2 P1
1
1LOE 2
J4001
CHASSIS 1LO 1
J1 J201
T13V 10
GND
REF
1LOE
L3
FOR
L5
1LO
L4
L2
L1
1 L6
J4201 J4401
1 29
2 30
to LOGIC unit J7
WS3
P6
W11 W10
SEND ALC
P5
CHASSIS
J701
2 1
1 29
J401
from PLL unit
J1
2nd LO
2 30
to LOGIC unit J6
9 - 1
ACC J4651
8V 1
GND 2
BDT 4
4 3 2 1
SEND 3
13.8V 8 8 7 6 5
7
AFO 12 12 11 9
10
BFO
MOD 11
from PLL unit J2
13
SQLS 13
1
BFO
ELEC-KEY FSKK 10
2
BFOE
KEY 6
J2001
BAND 9
ALC 5
13
10 11 12
9
5 6 7 8
1 2 3 4
J3601
3 2 1
RED BLACK
3 1
CHASSIS
FAN MOTOR MF1
The combination of this page and the next page shows
the unit layout in the same configuration as the actual
P.C. Board.
1
SPO
SPEAKER
SPO
SP1
SPE
SPE
2
EXT SP
REMOTE
J4502
SPE
ESPO
CIV
SPO
SPO
CIVE
SPE
J4101
1
TEMP
2 1 TEMP
KEY
KEY STRT
STRT HV HV
ICH
PAT8
ICH
ICL
PAT8
14V
ICL
14V 14V
14V
14V
14V 14V
14V
PWS
14V
GND
14V
15 GND
PWS GND
GND
to PA unit J3
15
GND
GND
16
2
16