Icom IC-F50V Service Manual

4 - 7
VIBERATION MOTOR CIRCUIT
(except [A], [D], [G], [J])
MF1 is a vibration motor. When the matched RX code signal
is received, MF1 rotates to produce viberation.
In vibration mode, and when the transceiver is called, "VIB"
signal from the expander (IC12, pin 6) turns to "High(=VCC
level)" and motor driver (Q30, Q31) is activated to rotate the
vibration motor (MF1).
AGC (Automatic Gain Controller) CIRCUIT
The AGC circuit effectively reduces the RX signal level if
the signal is strong, and raises it when it is weaker. The
AGC circuit detects the overall strength of the signal and
automatically adjusting the gain of the RF AMP to maintain
an approximately constant average level of the received
signals.
RSSI signal which is in proportion to the RX signal level is
applied to the gate terminal of AGC line driver. The driver
controls the voltage which supplied to the RF AMP to
control the gain of RF AMP.
C26
C186
R11
R12
R172
C
42
6P
C25
R15
R18
R13
D9
R2 2
C28
C2 2
R20
C39
D23
C36
C23
Q2
C37
D8
R171
Q1
L7
C20
R19
R174
L9
C29
C35
R173
2
4
C184
C32
R213
R14
C33
R175
L8
R16
C31
R17
D4
C30
C38
R5V
RF
AMP
AGC LINE
DRIVER
Two-staged
TUNED BPF
• AGC CIRCUIT
+5
REG
IC9
T5
REG
REG
R5
Q22
Q21
REG
S5
Q23
Q24
Q25
VCC
+5V
S5V
R5V
T5V
Pre-drive AMP (Q9), APC AMP (IC2), etc.
IF IC (IC1), 1st IF AMP (Q4), 1st mixer (Q3), RF AMP (Q2), etc.
PLL IC (IC4), VCOs, etc.
Base-band IC (IC10), DAC (IC6), etc.
CPU (IC401), EEPROM (IC409), expander (IC410)
S5C
R5C
T5C
CPU5
PWR
MAIN UNITVR UNIT
FRONT UNIT
FRONT UNIT
R601
SW
POWER
Q26
F1
1
BATTERY PACK
2
4-5 VOLTAGE BLOCK DIAGRAM
Voltage from the battery pack is routed to whole of the transceiver via switches and regulators.
Q31
MF1
R202
C317 C315
Q30
C316
R203
C318
R201
VIB
VCC
M
• MOTOR DRIVER
4-4 OTHER CIRCUITS

Icom IC-F50V Specifications

General

Brand	Icom
Model	IC-F50V
Category	Transceiver
Language	English