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PDF ( 数据手册 , 数据表 ) IC-7400

零件编号 IC-7400
描述 HF/VHF ALL MODE TRANSCEIVER Service Manual
制造商 Icom
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IC-7400 数据手册, 描述, 功能
HF/VHF
ALL MODE TRANSCEIVER
S-14610XZ-C1
Jul. 2009







IC-7400 pdf, 数据表
• CR-338 HIGH STABILITY CRYSTAL UNIT
By installing the CR-338, the total frequency stability of the
transceiver will be improved.
q Remove the bottom cover as shown on the previous page.
w Remove the 4 screws from the shield cover of the RF unit,
and disconnect P2 (CHASSIS) from J761 (MAIN unit), then
lift up the shield cover.
• There is an earth spring on the shield cover, so be careful
not to lose it when removing the cover.
Earth spring
Shield cover
P2
(CHASSIS)
TUNER
(antenna tuner)
connector
RF unit
J761
(MAIN unit)
e Remove the 8 screws from the RF unit, disconnect J1, J121
and J151, then remove the RF unit.
r Remove the supplied internal crystal and replace with the
CR-338.
t Return the RF unit, J1, J121 and J151 to their original posi-
tions.
Black belt
Blue
belt
J151
Blue
J1
Black
J121
Red
CR-338
Supplied crystal
Red belt
Soldering
points
RF unit
y Connect a frequency counter to the J262, 2LO IN, then ad-
just the reference frequency to be 64.00000 MHz with the
L1901 on the RF unit.
u Return the J262, shield cover, earth spring and bottom cov-
ers to their original positions.
Connect a frequency counter, then adjust
the frequency to be 64.00000 MHz.
RF unit
J262
2LO IN
L1901
4-1







IC-7400 equivalent, schematic
(1) CPU and EEPROM (CTRL unit)
The antenna tuner CPU (IC5) controls the tuning motors via
the motor driver circuit (Q211–Q218) and tuning relays di-
rectly, and memorizes the best preset position in 100 kHz
steps. The memory contents are stored in the EEPROM
(IC6) without a backup battery.
(2) Tuning motors (CTRL unit)
The motor driver circuit (Q211–Q218) rotates the tuning mo-
tors (MF1, MF2) to obtain a low SWR.
(3) Tuning relays (TUNER unit)
According to the operating frequency band and antenna con-
dition, tuning relays select the capacitors (C34–C43) and
coils ( L3–L9, L11, L12).
4-4-4 ANTENNA TUNER CPU PORT ALLOCATION
(CTRL unit; IC5)
Pin
number
1
Port
name
AN2
Description
Input port for the resistance com-
ponents detection voltage.
Input port for the reflected RF
2 AN1 power voltage.
3
AN0
Inpout port for the forward RF
power voltage.
Input port for the transceiver power
4 PWRS OFF.
7
SETI
Input port for the reference voltage
setting.
13 CIKY Outputs tuner data signal.
15 CIST Input port for the serial signal.
17
THRU
Outputs the [TUNER] ON/OFF sig-
nal.
19 CDRS Input port for reset signal.
21
TRC
Input port for the TX/RX switching
signal.
22, 23
XIN, XOUT
Input ports for the antenna tunner
CPU system clock.
25, NVHF, CO3,
34–36 CO2, CO1, Output the capacitor selection sig-
38–40 CI3, CI2, CI1 nals.
VHF, 24M,
26–32 18M, 14M, Output the coil selection signals.
10M, 7M, 4M
Output ports for the tuning motor
41–44 P07–P04 (MF2) drive signals.
45–48
P03–P00
Output ports for the tuning motor
(MF1) drive signals.
64
AN3
Input port for the reactance compo-
nents detection voltage.
4-5 POWER SUPPLY CIRCUITS
4-5-1 PA UNIT
Line
Description
H14V
The voltage from an external power supply via
the common filter circuit (FILTER board, L1).
HV
The same voltage as the H14V line passed
through a fuse.
14VS
The same voltage as the HV line passed through
the switching relay (RL1).
14V
The same voltage as the 14VS line passed
through coils (L22, L23).
8V
Common 8 V converted from the 14V line and
regulated by the +8 regulator circuit (IC3).
5V
Common 5 V converted from the 14V line and
regulated by the +5 regulator circuit (IC2).
H5V
Common 5 V converted from the HV line and
regulated by the +5 regulator circuit (IC1).
4-5-2 S-LOGIC BOARD
Line
Description
–8 V
Common –8 V converted from the 14V line and
regulated by the –8 V DC-DC converter (IC401).
4-5-3 MAIN UNIT
Line
Description
Receive 8 V converted from the 14V line and
R8V regulated by the R8V regulator circuit (Q451,
Q453).
Transmit 8 V converted from the 14V line and
T8V regulated by the T8V regulator circuit (Q450,
Q452).
4-5-4 PLL UNIT
Line
Description
5VPLL
Common 5 V converted from the 8V line and
regulated by the 5 V regulator circuit (IC1051).
4-8










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