Icom IC-Q7A Service Manual page 10

4-3-2 1ST VCO CIRCUIT (RF UNIT)
4-3-3 2ND LO VCO CIRCUIT (RF UNIT)
The 2nd LO VCO circuit generates the 2nd LO frequencies,
and the signals are applied to the 2nd mixer circuit.
e 2nd LO VCO circuit
037, 053
Ripple
filter
АЗУ
to the 2nd mixer (IC10)
* PLL circuit
Loop
Q2, 045 | filter
4-4 POWER SUPPLY CIRCUITS
VOLTAGE LINE
LINE | DESCRIPTION
The voltage from the attached battery.
Common 13 V converted from BATT line by the
DC-DC convertors (IC10 and D3, D5, D15). The
output voltage is applied to the PLL circuit (RF
unit).
VP
the "TXV" signal from CPU (IC11).
UHF transmit 2V controlled by the +2.0 switch
UHT2V | (028) from the +2V regulator (021, Q32) using
the "TXU" signal from CPU (IC11).
Common 3V converted by the +3S regulator cir-
43S
|сий (Q3, 039) using the "+3$С" signal from CPU
E 1).
Common 3V controlled by the +3V regulator cir-
43V
| сий (Q6) using the "РОМЕНС" signal from CPU
E (IC11).
Transmit 3V controlled from +3V line by the 3V
regulator circuit (Q5).
to transmitter circuit
—
to 1st mixer circuit
>.
Programmable
9 Prescaler
13 [Phase
[detector
tothe FMIFIC 17 Programmable
Гу PSTB
Shift register 15 CLK
DATA
| divider
16 }
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