Icom IC-R3 Service Manual

4 - 9
Pin Port
Description
number name
42
45
51
52
54
56
57
58
59
60
61
62
63
64
ECS
PSTB
OSSTB
TGSTB
DATA
UHF3VC
174MC
108MC
HFC
ATT3
ATT2
ATT1
AM
WFM
Outputs chip select signal for the
EEPROM (LOGIC unit; IC2, pin 1).
I/O port for strobe signal from/to the
PLL IC (VCO unit; IC3, pin 3).
Outputs chip select signal for the color
LCD.
Outputs color LCD load signal.
• Outputs color LCD control signal.
• Outputs serial data for the LCD con-
trollor.
Outputs bandpass filter select signal.
Low : When frequencies 330 to 470
MHz are displayed.
Outputs bandpass filter select signal.
Low : When frequencies 174 to 225
MHz are displayed.
Outputs bandpass filter select signal.
Low : When frequencies 108 to 174
MHz are displayed.
Outputs control signal for the HF band
receiver regurator circuit (RF unit; Q5).
Low : When frequencies 0.5 to 30
MHz are displayed.
Outputs attenuater control signal.
High : While attenuater is ON.
Outputs AM mode select signals.
Low : When AM is selected.
Outputs WFM mode select signals.
Low : When WFM is selected.
4-5-2 CPU (LOGIC UNIT; IC11)
Pin Port
Description
number name
2
9
10
11
15
17
18
19
20
21
23
24
25
26
27
29
30
31
32
33
41
THERMC
TRACC
FSET
TCON
VRC
CHGC
AMUTE
CLOUT
CLIN
BEEP
POWERC
AFON
RXC
DCDC_C
+3SC
CONVC
TVC
LIGHT
CPUHV
RESET
ECK
Input port for the receiver’s internal
temperature detection.
Outputs tracking control signal.
Outputs control signal for the RIT fre-
quency.
Outputs control signal for the CTCSS
regulator circuit (LOGIC unit; IC9, pin
3).
Low : While the CTCSS is ON.
Outputs level control signal for the AF
volume.
Outputs battery charger control signal.
High : While charging battery.
Outputs the AF mute switch (LOGIC
unit; Q37) control signal.
High : While squelched.
Outputs the cloning signal.
Input port for the cloning signal.
Outputs beep audio signals.
Outputs the +3V regurator control sig-
nals.
Low : Power switch is pushed.
Outputs control signal for the AF
amplifier regurator circuit.
High : Activates the AF amplifier cir-
cuit.
Outputs control signal for the receiver
regulator circuit.
Outputs the DC-DC converter (LOGIC
unit; IC801, pin 2) control signal.
Low : While color LCD is displayed.
Outputs the +3S regurator control sig-
nal.
Outputs control signal for the convert-
er circuit.
Low : When frequencies above
1150 MHz are displayed.
Outputs control signal for the TV
receive circuit.
Low : While TV band receiving.
Outputs key and LCD backlight con-
trol signal.
High : Lights ON.
Input port for connecting the external
power supply detection.
Low : While connecting the external
power supply.
Input port for the RESET signal.
I/O port for the EEPROM (LOGIC unit;
IC2, pin 1) serial clock.

Icom IC-R3 Specifications

General

Brand	Icom
Model	IC-R3
Category	Receiver
Language	English