Main Unit Voltage Line; Port Allocations; Sub-Cpu - Icom IC-7000 Service Manual

3-5-2 MAIN UNIT VOLTAGE LINE

Line
Common 3.3 V converted from the 5 V line
by the 3.3 V regulator circuit (IC1801). The
3.3 V
output voltage is applied to the D/A convert-
er ICs (IC2151–IC5155), etc.
Common 5 V converted from the H V line by
the 5 V regulator circuit (IC1951). The output
5 V voltage is applied to the CODEC IC (LOGIC
unit; IC551), low-pass filters (LOGIC unit;
IC451, IC502), etc.
Common 8 V line converted from the HV
line by the 8 V regulator circuit (IC1901).
8 V The output voltage is applied to the buffer
amplifiers (IC2101–IC2103), analog switches
(IC2156, IC2251), etc.
Transmit 8 V controlled by the T8 regulator
circuit (Q1703, Q1704) using TXS signal
from the CPU (LOGIC unit; IC1302, pin
T 8
106). The output voltage is applied to the RF
switch (Q101), 2nd IF amplifier (Q701), 3rd
IF amplifier (Q901), etc.
Receive 8 V controlled by the R8 regulator
circuit (Q1701, Q1702) using RXS signal
from the CPU (LOGIC unit; IC1302, pin 105).
R 8
The output voltage is applied to the 2nd IF
amplifier (Q702), 3rd IF amplifier (Q1001),
3rd mixer (Q1101), etc.

3-6 PORT ALLOCATIONS

3-6-1 SUB-CPU (DISPLAY UNIT; IC2003)
Pin Port
number name
MDBK,
3, 5 Input ports for [DIAL].
MDAK
S1AK,
13, 14 Input ports for [PBT2/M-ch] control.
S1BK
S2AK,
15, 16 Input ports for [PBT1/RIT] control.
S2BK
21 VRK Input port for [AF] switch.
22 PBTK Input port for [PBT/M-ch] switch.
23 TUNK Input port for [TUNER/CALL] key.
24 TSK Input port for [TS] key.
25 LCKK Input port for [LOCK] key.
26 BUPK Input port for [Y(BAND)] key.
27 BDNK Input port for [Z(BAND)] key.
Input port for the HM-151 connection
28 FMSL
detection.
I n p u t p o r t fo r t h e h e a d p h o n e s
35 PHNK
connection detection.
Outputs clock signal for the LCD driv-
37 LCK
er (IC506).
Description
Description
Pin Port
number name
38 LDT
39 LDST
47 FSQS
48 RXD
54 BLV
55 KLV
56 TXD
57 PBT1D
58 PBT2D
70 LRXD
71 LTXD
73 AFGL
74 SQLL
75 PTTL
77 FUDL
78 KI0L
79 KI1L
80 KI2L
3 - 9
Description
Outputs data signal for the LCD driver
(IC506).
Outputs strobe signal for the LCD
driver (IC506).
Outputs the squelch control signal.
High : Squelch is opened.
Outputs the RX LED control signal.
High : While receiving or squelch is
opened.
Outputs the dimmer control signal for
the LCD backlights.
Outputs the dimmer control signal for
the key backlights.
Outputs TX LED control signal.
Low : While transmitting.
Outputs control signal for [PBT/M-ch/
RIT] indicator.
Low : While the RIT function is ON.
Outputs control signal for [PBT/M-ch/
RIT] indicator.
Low : While the PBT function is ON.
Input port for data signal from the
main CPU (LOGIC unit; IC1302).
Outputs data signal to the main CPU
(LOGIC unit; IC1302).
Input port for [AF] control.
Input port for [RF/SQL] control.
Input port for PTT control signal from
the microphone that is connected to
the FRONT unit.
Input port for [UP] and [DN] switch-
es from the optional microphone
(HM-103, SM-20) that is connected to
the FRONT [MIC] connector.
Input port for [MODE], [P.AMP/ATT],
[Y(MENU/GRP)] and [Z(MENU/
GRP)] keys.
Input port for [F-1], [F-2], [F-3] and
[F-4] keys.
Input port for [NB LEV], [NR LEV], [N/
ANF] and [SET/REC] keys.