Icom IC-7800 Service Manual Addendum page 369

3-7-31 CPLD IC (LOGIC UNIT; IC52)
Pin Port
number name
60, 61
63–68, IMS0–IMS8 Output the matrix/strobe signals.
70
71 IMR0 Input port for the matrix return signal.
Outputs permit signal to read the
72 IMRE0
matrix return signal.
74 IMR1 Input port for the matrix return signal.
Outputs permit signal to read the
76 IMRE1
matrix return signal.
Input port for the writing status signal
to the flash ROM (MEMORY board;
77 FR_STS
IC2, pin 5).
Outputs permit signal to write data to
the flash ROM (MEMORY board; IC2,
78 FR_VPEN
pin 15).
Input port for the "VS" signal from the
92 DO_VS
GDC IC (IC203).
Input port for the "HS" signal from the
93 DO_HS
GDC IC (IC203).
Outputs "HS" signal for the external
94 EX_HS
monitor.
Outputs "VS" signal for the external
95 EX_VS
monitor.
3-7-32 EXPANDER IC (TENKEY BOARD; IC1)
Pin Port
number name
Outputs [TX] LED for main band con-
trol signal.
6 MTXD
Low : While transmitting.
Outputs [RX] LED fir main band con-
trol signal.
Low : While receiving a signal or
7 MRXD
Outputs [DIAL LOCK] LED for main
dial control signal.
8 MLCD
Low : [MAIN DIAL] is locked.
Outputs [SPLIT] LED control signal.
9 SPLD
Low : During spilt operation.
Outputs [TX] LED for sub band control
signal.
10 STXD
Low : While transmitting in split
Outputs [RX] LED for sub band con-
trol signal.
Low : While receiving a signal or
11 SRXD
Outputs [DIAL LOCK] LED for sub dial
control signal.
12 MLCD
Low : [SUB DIAL] is locked.
TKYD1,
TKYD2, Output tenkey backlight control sig-
13–16
TKYD3, nals.
TKYD4
Description
Description
squelch is opened in main
band.
operation.
squelch is opened in sub
band.
3-7-33 EXPANDER IC (TENKEY BOARD; IC2)
Pin Port
number name
6 MPCD
7 SPCD
8 MAPD
9 SAPD
12 MNCD
13 SNCD
14 SUBD
15 MIND
3 - 25
Description
Outputs [PBT CLEAR] LED for main
band control signal.
Low : While using the PBT function
in main band.
Outputs [PBT CLEAR] LED for sub
band control signal.
Low : While using PBT function in
sub band.
Outputs [APF/TPF] LED for main
band control signal.
Low : While using [APF/TPF] func-
tion in main band .
Outputs [APF/TPF] LED for sub band
control signal.
Low : While using [APF/TPF] func-
tion in sub band .
Outputs [NOTCH ON] LED for main
band control signal.
Low : While using [NOTCH] func-
tion in main band .
Outputs [NOTCH ON] LED for sub
band control signal.
Low : While using [NOTCH] func-
tion in sub band .
Outputs [SUB] LED control signal.
Low : While sub band access is
enabled.
Outputs [MAIN] LED control signal.
Low : While main band access is
enabled.