Icom IC-R20, Руководство по обслуживанию

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4 - 12
48
49–52
53
54
55–61
63
64
65
66
67
68
69
70
71
72
74
75
76
77
78
79–81
98
99
Outputs strobe signal to the D/A con-
verter IC (IC22, pin 1).
Output key matrix signals.
• Input port for the matrix signal.
• Outputs power ON/OFF control sig-
nal.
• Input port for the matrix signal.
• Outputs B-RTONE filter amplifier
control signal.
Input ports for key matrix
Outputs B-BAND de-emphasis control
signal.
Outputs strobe signals to the A-BAND
1st LO circuit.
Outputs strobe signals to the A-BAND
2nd LO circuit.
Outputs strobe signals to the DOWN
CONVERTER LO circuit.
Outputs A-BAND power supply circuit
control signal.
Low : While A-BAND receiving.
Outputs clock signal to the PLL IC.
Outputs strobe signals to the B-BAND
2nd LO circuit.
Outputs strobe signals to the B-BAND
1st LO circuit.
Outputs A-RTONE filter amplifier con-
trol signal.
Outputs LCD chip select signal.
Outputs BFO control signal.
Low : While SSB is receiving.
Outputs B-BAND power supply circuit
control signal.
Low : While B-BAND receiving.
Outputs reset signal to the LCD.
Outputs command and data signals to
the LCD.
Outputs strobe signals to the expander
IC (RF unit; IC20, pin 15).
Output B-BAND 1st LO circuit control
signals.
Outputs clock signal to the EEPROM
(IC1, pin 6).
I/O port for data signal from/to the
EEPROM (IC1, pin 5).
STR2
KS3–KS1
I1
PCON
L0
B_TCON
KR5–KR0
B_AF_THURU
PLLASTB
PLLCSTB
PLLESTB
A_R3C
PLLCK
PLLDSTB
PLLBSTB
A_TCON
LCD_CS
BFOC
B_R3C
LCD_RESET
LCD_RS
LD2
B_VCO2
B_VCO3
B_VCO4
ECK
ESIO
(LOGIC unit; IC3)–Continued
Pin Port
Description
number name
3
8
9
46
17
18
19
20
21–24
25
26
31
34
36
38
39
40
41
42
43
44
45
46
47
Outputs data and clock control signal.
Output clock shift signals.
Input port for the detecting signal
whether the external power supply is
connecting or not.
Low : The external power supply is
connected.
Outputs control signal to the AF ampli-
fier.
Input port for [POWER] key.
Outputs B-band mute control signal.
High : While B-band is muting.
Outputs A-BAND de-emphasis control
signal.
Input ports for [A-DIAL]/[B-DIAL].
Input port for [SQL] switch.
Low : While [SQL] switch is pushed.
Outputs REC unit regulator control sig-
nal.
High : While recording or playing.
Outputs A-BAND’s 1st LO control sig-
nal.
Outputs strobe signals for volume.
Outputs recording LED control signal.
Outputs charging current control sig-
nal.
High : While rapid charging.
Outputs charger circuit control signal.
High : While charging.
O3S regulator control signal.
Outputs LCD back light control signal.
Low : Lights ON.
Outputs strobe signals to the expander
IC (RF unit; IC14, pin 15).
Outputs BAND2 selecting signal in the
HF band.
Outputs BAND3 selecting signal in the
HF band.
Outputs BAND1 selecting signal in the
HF band.
Outputs HF band selecting signal at A-
BAND.
Outputs data signal to the PLL IC.
4-5 PORT ALLOCATIONS
4-5-1 MAIN CPU PORT ALLOCATIONS
(LOGIC UNIT; IC3)
DATAC
CLS1
CLS0
HVDET
AFON
POWER
B_AMUTE
A_AF_THURU
A_DUD
A_DCK
B_DUD
B_DCK
SQL
SUB_3C
A_VCO1
VRSTR
REC
CHGS
CHGC
+3S
LIGHT
LD1
B2C
B3C
B1C
HFC
PLLDATA
Pin Port
Description
number name