Icom IC-UR8050, Service Manual

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2 - 4
• PLL CIRCUITS
CPU
PLL IC
CHARGE
PUMP
VCO
Buff.
Buff.
PLL IC
CHARGE
PUMP
VCO
Buff. Buff.
N–DATA (TX)
N–DATA (RX)
Ref.
Ref.
TX signal to PA unit
RX signal to LOGIC unit
LOGIC unit
TX unit
RX unit
IC5
2-5 PORT ALLOCATIONS
2-5-1 CPU (LOGIC UNIT IC1)
2-4 POWER SUPPLY CIRCUIT
2-4-1 VOLTAGE LINES
LINE
13.8 V
S13.8 V
+ 9 V
+ 5 V
DESCRIPTION
The voltage from the connected DC power sup-
ply. The output voltage is applied to the CPU
(LOGIC unit; IC1, pin 45) via the V.DET circuit
(LOGIC unit; IC21, pin 3 and 5).
The same voltage as the 13.8 V line which is
controlled by the power switch (FRONT unit; S1).
The output voltage is applied to the AF amplifier
(LOGIC unit; IC15, pin 5) via the “V13” line.
Common 9 V converted from the DC power sup-
ply by the + 9 V regulator circuit (REG unit; IC1).
The output voltage is applied to TX switch, + 5 V
regulator, ripple filter on TX unit and + 5 V regu-
lator, ripple filter on RX unit.
Common 5 V converted from the + 9 V regulator
circuit (REG unit; IC1) by the + 5 V regulator cir-
cuit (LOGIC unit; IC9).
The output voltage is applied to RESET circuit
(LOGIC unit).
Pin Port
Description
number name
3
4
5
29
30
31
32
45
46
47
48
49
54
55
56
57
58
P62 / A18
P61 / A17
P60 / A16
P21 /
INTP0
P22 /
INTP1
P23 /
INTP2 / C1
P24 /
INTP3
P74 / AN4
P73 / AN3
P72 / AN2
P71 / AN1
P70 / AN0
P00
P01
P02
P03
P04
Outputs LOCAL INHIBIT LED control
signal .
Outputs COR SIMURATE LED control
singal.
Outputs RESET LED control signal.
Input port for the transmitting mode
from the outside signal.
Input port for the STB signal to switch
the outside frequency.
Input port for the LOCAL mode from
the outside signal.
Input port for the RESET signal from
the outside signal.
Input port for the VD, H signal from the
DC power supply voltage detecting
circuit.
Input port for the VD, L signal from the
DC power supply voltage detecting
circuit.
Input port for the TX unlock signal.
Input port for the RX unlock signal.
Input port for the squelch signal.
Outputs clock signal to TX and RX
PLL IC.
Outputs data signal to TX and RX PLL
IC.
Outputs LE signal to TX PLL IC.
Outputs LE signal to RX PLL IC.
Outputs control signal for transmitting.