Icom IC-7200, Service Manual

Page: 87 / 135

• CPU (LOGIC UNIT: IC1) (continued)
3 - 6
PIN
No.
LINE
NAME
SIGNAL DESCRIPTION I/O ACTIVE
PULL-UP/
PULL-DOWN
69 PDT
PLL+MAIN system data (M62352GP×2, AD9951,
AD9833)
O H data=1 –
70 PCK
PLL+MAIN system clock (M62352GP×2, AD9951,
AD9833)
O – data latch –
71–75
KS0–
KS4
Key matrix strobe output 0 O H H strobe subject of interrrupt –
76 SQSS
Squelch signal (SQLS) output via the [ACC/MIC]
terminal
O H open (mute OFF)
47 k
Ω
pull-
down
77 RTKI Keying input for RTTY I H H=SPACE (keying) 47 k
Ω
pull-up
78 MSNDS External SEND control (via MIC jack) O H
transmitting (except MIC
SEND)=H 47 k
Ω
pull-
down
79 MNFL Manual notch volume input I – CCW=0 V, CW=5 V –
80 DCVL Power voltage loading I – power voltage 5V convert –
81 DOTK DOT input (keying) I L down=1.55 V, up=2.5 V 47 k
Ω
pull-up
82 DASK DASH input (keying) I L down=1.55 V, up=2.5 V 47 k
Ω
pull-up
83 IPD Pre-driver current (sauce voltage) input I –
In proportional
(Voltage vs Current)
–
84 IDL Id (current) loading I –
In proportional
(Voltage vs Current)
–
85 SNDL SEND loading (from ACC socket) I L Detect TX (less than 1.0 V) –
86 ALML ALC meter I – 0 (min)–5 V (max) –
87 REFL REF voltage (SWR detection) I – 0 (min)–5 V (max) –
88 FORL FOR voltafe (SWR detection) I – 0 (min)–5 V (max) –
89 FANL PA UNIT temperature (thermo-sensor) I – 0 (min)–5 V (max) –
90 UDL MIC UP/DOWN input I – 0–5 V –
91 PB2L [TWIN PBT] volume (outer)input I – CCW=0 V, CW=5 V –
92 PB1L [TWIN PBT] volume (inner)input I – CCW=0 V, CW=5 V –
93 RFGL [SQL/RF] gain volume input I – CCW=0 V, CW=5 V –
95 AFGL [AF gain] volume input I – CCW=0 V, CW=5 V –
96 VREF A/D conversion reference voltage (=VCC1) I – – –
98 LOST Strobe for shift register for 1st LO filter O H – –
99 MSNDL SEND signal from [MIC] jack. I L TX detect (less than 1.0 V) –
100 DRFS DSP data frame(RX) O H – –
LINE NAME DESCRIPTION ACTIVE
AMS AM mode select H
B8WS RX BPF/LPF (33.000000 MHz and higher) select H
B8S TX BPF/LPF (33.000000 MHz and higher) select H
PROF PREAMP OFF H
PRON PREAMP ON H
ATTS Attenuator control L
L3S LPF (5.000000–7.999999 MHz) select H
L2S LPF (2.000000–4.999999 MHz) select H
LINE NAME DESCRIPTION ACTIVE
B0S BPF/LPF (0.030000–1.599999 MHz) select H
B1S BPF/LPF (1.600000–1.999999 MHz) select H
B2S BPF/LPF (2.000000–3.999999 MHz) select H
B3S BPF/LPF (4.000000–7.999999 MHz) select H
B4S BPF/LPF (8.000000–10.999999 MHz) select H
B5S BPF/LPF (11.000000–14.999999 MHz) select H
B6S BPF/LPF (15.000000–21.999999 MHz) select H
B7S BPF/LPF (22.000000–32.999999 MHz) select H
• SHIFT REGISTER (RF UNIT: IC141)
• SHIFT REGISTER (RF UNIT: IC142)
• SHIFT REGISTER (MAIN UNIT: IC2701)
LINE NAME DESCRIPTION ACTIVE
LOF0 1st LO filter (0.030000–14.999999 MHz) select H
LOF1 1st LO filter (15.000000–29.999999 MHz) select H
LOF2 1st LO filter (30.000000–44.999999 MHz) select H
LOF3 1st LO filter (45.000000–54.000000 MHz) select H