Power Supply Circuits - Icom IC-F41GS Servise Manual

4-4 POWER SUPPLY CIRCUIT
VOLTAGE LINE
LINE
HV The voltage from the attached battery pack.
The same voltage as the HV line (battery volt-
VCC age) which is controlled by the power swtich
([VOL] control).
Common 5 V converted from the VCC line by the
reference regulator circuit (IC12). The output volt-
CPU5V
age is applied to the CPU (IC14), 5 V regulator
circuit (Q32, Q33), reset circuit (IC15), and etc.
Common 5 V converted from the VCC line by the
+5V
+5V regulator circuit (Q32, Q33).
Common 5 V converted from the +5V line by the
S5V
S5V regulator circuit (Q31).
5 V for transmitter circuits regulated by the T5V
T5V
regulator circuit (Q29).
5 V for receiver circuits regulated by the R5V
R5V
regulator circuit (Q30).
4-5 PORT ALLOCATIONS
4-5-1 CPU (IC14)
PIN PORT
NO. NAME
Outputs reset signal for the expader IC
4 RESB
(IC23).
Input port for AF mute signal from the
5 RMUT
optional units via J1 or J2.
Input port for MIC mute signal from the
6 MMUT
optional units via J1 or J2.
Input port for the [PTT] switch
7 PTOT
Low : While [PTT] switch is pushed.
Outputs strobe signals to the expander
13 EXST
IC (IC23).
Outputs strobe signals to the compan-
15 APST
der IC (IC9).
Outputs serial data signals to the com-
16 DIN
pander IC (IC9).
17, RGS1,
Output control signal for the compan-
18, RGS2,
der IC (IC9).
19, MSKE,
Outputs reset signal for the compan-
21 FCLR
der IC (IC9).
22– CB10–
Input ports for rotary selector [SEL].
25 CB13
Outputs TX VCO/RX VCO switching
26 VCOS signal for the VCO switch (Q9, Q10).
High : While transmitting
Outputs strobe signals to the PLL IC
28 PLST
(IC1).
Input port for the PLL unlock signal.
29 ULCK
Low : PLL is unlocked.
Outputs clock signal for the PLL IC
34 SCK (IC1), compamder IC (IC9), expander
IC (IC23), D/A converter (IC13), etc.
DESCRIPTION
DESCRIPTION
PIN PORT
NO. NAME
35 SO
36 DAST
39 DTAC
43 SENC
44 CTDA
45 SDEC
46 RXDT
47 AFVI
49 LVIN
50 RSSI
59 RES
68 DTSD
70 TMUT
71 R5C
73 T5C
75 NOIS
81 SDA
82 MSO
87 BEEP
94 MSCK
95 SCL
4-5-2 I/O EXPANDER (IC23)
Pin Port
number name
4 BUSY
6 DUSE
7 W/N
11 S5C
12 SPCN
13 AFMT
14 FSW
4 - 4
DESCRIPTION
Outputs data signals for the PLL IC
(IC1), compamder IC (IC9), expander
IC (IC23), D/A converter (IC13), etc.
Outputs strobe signals to the D/A con-
verter (IC13).
Output clock signal to the DTMF
decoder (IC17).
Outputs single tone signal.
Outputs CTCSS/DTCS tone signal.
Single tone signal input port for decod-
ing.
CTCSS/DTCS signals input port for
decoding.
Input port for the volume control [VOL].
High : [VOL] is maximum clockwise.
Input port for the PLL lock voltage.
Input port for the RSSI detection.
Input port for the reset signal.
Outputs serial data signals to the
DTMF decoder IC (IC17).
Outputs transmit mute signal.
Low : During unlock or while muted
Outputs R5 regulator control signal.
Low: While receiving
Outputs T5 regulator control signal.
Low: While transmitting
Input port for noise signals (pulse-
type) for noise squelch operation.
I/O port for data signals from/to the
D/A converter (IC27).
I/O port for data signals from/to
EEPROMs (IC16, IC24).
Outputs beep audio signals.
Outputs clock signal to EEPROMs
(IC16, IC24).
Outputs clock signal to the D/A con-
verter (IC27).
Description
Outputs BUSY detection.
Low : The channel is busy.
Outputs low-pass filter cut-off frequen-
cy control signal when DTCS is acti-
vated.
Outputs IF bandwidth control signal.
High : While IF bandwidth is narrow.
Outputs S5 regulator control signal.
Outputs internal speaker select signal.
Outputs control signal for the AF
amplifier regulator circuit.
High: While AF amp. is activated.
Outputs high-pass filter's characteris-
tics select signal.