Icom IC-R2 Service Manual page 11

Pin Port
number name
26 LIGHT Output LCD backlight control signal.
High : Lights ON
Outputs +3S requlator control singal
27 +3SC for the receiver circuit.
Low : Receiving.
28 POWERC Outputs +3V requlator control singals.
Outputs high-pass filter select signal.
29 B3 Low : When frequency 15 to 30
Outputs band-pass filter select signal.
30 B2 Low : When frequency 1.9 to 15
Outputs low-pass filter select signal.
31 B1 Low : When frequency 0.5 to 1.5
Input port for the [SQL] switch.
32 KSQL
High : While [SQL] switch is pushed.
33 RESET Input port for the RESET signal.
Outputs data signals to the EEPROM
39 EDA
IC (LOGIC unit; IC2).
Outputs clock signal to both PLL IC
42 PCK/IS (RF unit; IC3) and EEPROM IC
(LOGIC unit; IC2).
43 ECK/I3 Outputs clock signal to EEPROM IC.
44, 45 I2, I1 Input ports for Initial matrix.
46 PSTB Outputs strobe signals for the PLL IC.
Outputs data signals to the PLL IC.
47 PDA Input port for PLL unlock signal from
PLL IC (RF unit; IC3).
Output control signal for the doubler
circuit.
48 DBL2
Low : Activates the 2nd doubler cir-
Outputs low-pass filter select signal.
Low : When frequencies 30 to 118
50 300MC
Outputs band-pass filter select signal.
51 GC Low :When frequencies 833 to
Outputs band-pass filter select signal.
52 800MC Low : When frequencies 470 to
Outputs band-pass filter select signal.
53 UHFC Low : When frequencies 330 to 470
Outputs band-pass filter select signal.
54 VHFC Low : When frequencies 118 to 175
Description
MHz are displayed.
MHz are displayed.
MHz are displayed.
cuit.
MHz or 175 to 330 MHz are
displayed.
1309.995 MHz are displayed.
1027 MHz are displayed.
MHz are displayed.
MHz are displayed.
Pin Port
number name
55 SHIFT
56 HFC
4 - 5
Description
Output port for 1st VCO SHIFT signals
to the shift switch (RF unit; Q29).
High : Shift ON (380 – 550 MHz).
Low : Shift OFF (267.2 – 380 MHz).
Output control signal for the 0.5–30
MHz band RF amplifier.
Low : Receiving 0.5–30 MHz bands.