Icom IC-R6 Service Manual page 13

4-5 CPU PORT ALLOCATION (continued)
Pin Line
No. Name
[FUNC] input.
114 FUNC
L= Pushed.
115 VR_STB Electric volume IC strobe.
IF demodulator IC chip enable.
116 IFCON
L=Activated.
CPU clock output. (For tuning voltage
117 CKOUT
generation)
118 BEEP Beep sounds. (Square waves)
Noise level detection.
119 NOISE
L=Squelch close.
The voltage from the external power
120 HVDET supply or attached battery pack.
L=Power source detection.
ＰＬＬ IC serial data.
121 PDAUL
ＰＬＬ IC strobe.
122 PSTB
ＰＬＬ IC serial clock.
123 PCK
[ ] input.
124 POWER
L=Pushed.
PLL IC power save mode control.
125 PPS
L=While in the power save mode.
Doubler circuit (DBL1; Q31, D44,
D47) control.
126 DBL2
L= While receiving 494.2–833 MHz
and 1066.7–1309.995 MHz.
Main power swtich (LOGIC UNIT:
127 PCON Q103) control.
L=IC-R6 is power ON.
+3S line control.
128 +3SC
L=Receiving.
Description I/O
I
O
O
O
O
I
I
O
O
O
I
O
O
O
O
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