Other Circuits; Voltage Block Diagram - Icom IC-F50V Service Manual

4-4 OTHER CIRCUITS

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).
• MOTOR DRIVER
Q31
M
MF1

4-5 VOLTAGE BLOCK DIAGRAM

Voltage from the battery pack is routed to whole of the transceiver via switches and regulators.
Q26
F1
2
1
POWER
SW
FRONT UNIT
PWR
R601
VR UNIT
VCC
R201
VIB
Q30
Q21
T5C
T5
R5C
REG
Q23 Q24 Q25
Q22
S5C
S5 R5
VCC REG REG
+5
REG
IC9
MAIN UNIT FRONT UNIT
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.
• AGC CIRCUIT
R5V
RF
AMP
C37
Q2
R2 2
T5V
Pre-drive AMP (Q9), APC AMP (IC2), etc.
R5V
IF IC (IC1), 1st IF AMP (Q4), 1st mixer (Q3), RF AMP (Q2), etc.
S5V
PLL IC (IC4), VCOs, etc.
+5V
Base-band IC (IC10), DAC (IC6), etc.
CPU5
CPU (IC401), EEPROM (IC409), expander (IC410)
4 - 7
AGC LINE
R172 Q1
DRIVER
R174
C186
Two-staged
TUNED BPF
C2 2
C29
D4
R14
C25
6P