Icom IC-R20, Руководство по обслуживанию

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4 - 11
Description
Receive 3 V line from the LOGIC unit via the J1,
pin 37. The voltage is supplied to the RF (IC19),
IF (Q5) and LO (Q540) amplifiers, 1st (IC1) and
2nd (IC10) mixers, regulators, etc.
Receive 3 V line from the LOGIC unit via the J1,
pin 22. The voltage is supplied to the RF (IC18),
IF (Q542) and LO (Q555) amplifiers, 1st (IC15)
and 2nd (IC16) mixers, regulators, etc.
Receive 3 V converted from the A_R3V line by
the +3 regulator (Q509). The regulator is con-
trolled by the HFC line from the main CPU
(LOGIC unit; IC3, pin 46).
Common 3 V converted from the A_R3V line by
the +3 regulator (Q527). The regulator is con-
trolled by the NBC line from the D/A converter
(IC22, pin 13).
Receive 3 V converted from the A_R3V line by
the +3 regulator (Q501). The regulator is con-
trolled by the A_300MC line from the expander
IC (IC14, pin 3).
Receive 3 V converted from the A_R3V line by
the +3 regulator (Q502). The regulator is con-
trolled by the A_VHFC line from the expander IC
(IC14, pin 2).
Receive 3 V converted from the A_R3V line by
the +3 regulator (Q502). The regulator is con-
trolled by the A_UHFC line from the expander IC
(IC14, pin 4).
Receive 3 V converted from the B_R3V line by
the +3 regulator (Q554). The regulator is con-
trolled by the B_VHFC line from the expander IC
(IC20, pin 2).
Receive 3 V converted from the B_R3V line by
the +3 regulator (Q554). The regulator is con-
trolled by the B_UHFC line from the expander IC
(IC20, pin 3).
Receive 3 V converted from the B_R3V line by
the +3 regulator (Q503). The regulator is con-
trolled by the B_GC line from the expander IC
(IC20, pin 4).
Receive 3 V converted from the B_R3V line by
the +3 regulator (Q503). The regulator is con-
trolled by the B_800MC line from the expander
IC (IC20, pin 5).
Receive 3 V converted from the B_R3V line by
the +3 regulator (Q546). The regulator is con-
trolled by the B_AMC line from the expander IC
(IC20, pin 18).
Line
A_R3V
B_R3V
HF3V
NB3V
300M3V
A_VHF3V
A_UHF3V
B_VHF3V
B_UHF3V
B_G3V
B_800M3V
B_AM3V
4-4-3 RF UNIT VOLTAGE LINES
Description
The voltage is same as connected battery pack.
The voltage is supplied to the charge controller
(Q32).
Common 3 V converted from the VCC line or
external DC power supply by the +3 regulator
(IC8, pins 1 and 5). The output voltage is sup-
plied to the main CPU (IC3), reset IC (IC2), EEP-
ROM (IC1), etc.
Common 3 V converted from the CPU3V line by
the +3 regulator (Q13 and Q14). The regulator is
controlled by the +3SC line from the main CPU
(IC3, pin 40). The output voltage is supplied to
the electronics volume (IC7), pre-amplifiers (Q12
and Q16), etc.
Common 3 V converted from the CPU3V line by
the +3 regulator circuit (Q17). The output voltage
is supplied to the CI-V interface circuit (IC4, Q3
and Q6), etc.
Receive 3 V converted from the VCC line or
external DC power supply by the +3 regulators
(IC9, pins 1 and 5; Q10). The regulator is con-
trolled by the A_R3C line from the main CPU
(IC3, pin 67). The output voltage is supplied to
the RF unit, etc.
Receive 3 V converted from the VCC line or
external DC power supply by the +3 regulators
(IC9, pins 1 and 5; Q15). The regulator is con-
trolled by the B_R3C line from the main CPU
(IC3, pin 75). The output voltage is supplied to
the RF unit, etc.
Line
VCC
CPU3V
+3S
+3V
A_R3
B_R3
4-4 POWER SUPPLY CIRCUITS
4-4-1 LOGIC UNIT VOLTAGE LINES
Description
Common 3 V from the LOGIC unit via the J7, pin
1, and is then supplied to the SUB_3V regulator
(Q2). The regulator is controlled by SUB_3C line
from the sub CPU (IC2, pin 45).
Common 3 V converted from +3V line by the
SUB_3V regulator (Q2). The output voltage is
supplied to the sub CPU (IC2), memory (IC6),
RECORDING IC (IC7), etc.
Line
+3V
SUB_3V
4-4-2 REC UNIT VOLTAGE LINES
Description
Common 3 V from the LOGIC unit via the J7, pin
1, and is then supplied to the SUB_3V regulator
(Q2). The regulator is controlled by SUB_3C line
from the sub CPU (IC2, pin 45).
Common 3 V converted from +3V line by the
SUB_3V regulator (Q2). The output voltage is
supplied to the sub CPU (IC2), memory (IC6),
RECORDING IC (IC7), etc.
Line
+3V
SUB_3V
4-4-2 REC UNIT VOLTAGE LINES