Icom IC-M604A Service Manual - Page 14

Power Supply Circuits, Port Allocations, 6-1 Voltage Line Main Unit, 7-1 Expander Ic Af Unit; Ic18

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4-6 POWER SUPPLY CIRCUITS 4-6-1 VOLTAGE LINE (MAIN UNIT) LINE HV VCC 8V 5V T8 R8 DESCRIPTION The 13.8 V from the connected DC power supply. Same voltage as the 13.8 V line, and is applied to the AF power amplifiers (AF unit; IC3, IC10), LOGIC unit, etc. Common 8 V converted from the VCC line at the +8V regulator circuit (AF unit; IC1). The output voltage is applied to the T8 controller (MAIN unit; Q36, Q36), +5 regulator (AF unit; IC2), R8 regulator (AF unit; Q1, Q2), etc. Common 5 V converted from the 8V line at the +5 regulator circuit (AF unit; IC2). The output voltage is applied to the buffer amplifiers (AF unit; IC19, Q14), expander ICs (AF unit; IC17, IC18), etc. Transmit 8 V controlled by the T8 control circuit (MAIN unit; Q35, Q36) using the "SEND" signal from main CPU. The output voltage is applied to the pre-dirve (MAIN unit; Q28), YGR amplifier (MAIN unit; Q30), APC controller (MAIN unit; IC14), etc. Receive 8 V controlled by the R8 control circuit (AF unit; Q1, Q2) using the RCV signal from main CPU. The controlled voltage is applied to the bandpass filter (AF unit; Q11, Q12), buffer and IF amplifiers (AF unit; Q2 and Q23), etc. 4-7 PORT ALLOCATIONS 4-7-1 EXPANDER IC (AF unit; IC18) Pin number 4 Port name MICS2 Description Outputs HM-162/2 control signal. High : While transmitting via the HM-162/2. Outputs HM-162/1 control signal. 5 MICS1 High : While transmitting via the HM-162/1. Outputs HM-162/2 control signal. 6 SPS2 High : While receiving via the HM-162/2. Outputs HM-162/1 control signal. 7 SPS1 High : While receiving via the HM-162/1. Outputs the internal speaker (FRONT 11 SP unit; SP1) control signal. High : The speaker is activating. Outputs beep audio level control sig12 BPLVL nal. Low : Beep audio level is maximum. Outputs the R8 regulator (AF unit; Q1, 13 RCV Q2) control signal. High : While receiving. Outputs the Hailer speaker TX/RX select signal. 14 HLC High : While transmitting via the Hailer speaker. 4-7-2 EXPANDER IC (AF unit; IC17) Pin Port number name Description Outputs scrambler unit bypass control 4 STRU signal. High : Bypassing the scrambler unit. 5 AFSUB Outputs sound signals to the HM-162. High : Sounding from HM-162. Outputs voice signals from IC-M602 6 INCMH to HM-162 using intercom function. High : While receiving. Outputs voice signals from HM-162 to 7 INCHM IC-M602 using intercom function. High : While transmitting. Outputs MIC/DSC modulation circuit control signal. 11 MIC/DSC High : While the DSC signal is mod- ulated. 12 HAILIN Outputs the microphone select signal. High : While using the hailer speaker. 13 FOGC Outputs fog horn control signal. High : Fog horn is ON. 14 HAILOUT Outputs the microphone select signal. High : While using the HM-126. 4 - 6

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4-6 POWER SUPPLY CIRCUITS
4-6-1 VOLTAGE LINE (MAIN UNIT)
4-7 PORT ALLOCATIONS
4-7-1 EXPANDER IC (AF unit; IC18)
4-7-2 EXPANDER IC (AF unit; IC17)
LINE
HV
VCC
8V
5V
T8
R8
DESCRIPTION
The 13.8 V from the connected DC power sup-
ply.
Same voltage as the 13.8 V line, and is applied
to the AF power amplifiers (AF unit; IC3, IC10),
LOGIC unit, etc.
Common 8 V converted from the VCC line at
the +8V regulator circuit (AF unit; IC1). The out-
put voltage is applied to the T8 controller (MAIN
unit; Q36, Q36), +5 regulator (AF unit; IC2), R8
regulator (AF unit; Q1, Q2), etc.
Common 5 V converted from the 8V line at the
+5 regulator circuit (AF unit; IC2). The output
voltage is applied to the buffer amplifiers (AF
unit; IC19, Q14), expander ICs (AF unit; IC17,
IC18), etc.
Transmit 8 V controlled by the T8 control circuit
(MAIN unit; Q35, Q36) using the “SEND” signal
from main CPU. The output voltage is applied to
the pre-dirve (MAIN unit; Q28), YGR amplifier
(MAIN unit; Q30), APC controller (MAIN unit;
IC14), etc.
Receive 8 V controlled by the R8 control circuit
(AF unit; Q1, Q2) using the RCV signal from
main CPU. The controlled voltage is applied to
the bandpass filter (AF unit; Q11, Q12), buffer
and IF amplifiers (AF unit; Q2 and Q23), etc.
4
5
6
7
11
12
13
14
MICS2
MICS1
SPS2
SPS1
SP
BPLVL
RCV
HLC
Outputs HM-162/2 control signal.
High :
While transmitting via the
HM-162/2.
Outputs HM-162/1 control signal.
High :
While transmitting via the
HM-162/1.
Outputs HM-162/2 control signal.
High :
While receiving via the
HM-162/2.
Outputs HM-162/1 control signal.
High :
While receiving via the
HM-162/1.
Outputs the internal speaker (FRONT
unit; SP1) control signal.
High : The speaker is activating.
Outputs beep audio level control sig-
nal.
Low : Beep audio level is maximum.
Outputs the R8 regulator (AF unit; Q1,
Q2) control signal.
High : While receiving.
Outputs the Hailer speaker TX/RX
select signal.
High :
While transmitting via the
Hailer speaker.
Pin
Port
Description
number
name
4
5
6
7
11
12
13
14
STRU
AFSUB
INCMH
INCHM
MIC/DSC
HAILIN
FOGC
HAILOUT
Outputs scrambler unit bypass control
signal.
High : Bypassing the scrambler unit.
Outputs sound signals to the HM-162.
High :
Sounding from HM-162.
Outputs voice signals from IC-M602
to HM-162 using intercom function.
High : While receiving.
Outputs voice signals from HM-162 to
IC-M602 using intercom function.
High : While transmitting.
Outputs MIC/DSC modulation circuit
control signal.
High :
While the DSC signal is mod-
ulated.
Outputs the microphone select signal.
High :
While using the hailer speaker.
Outputs fog horn control signal.
High : Fog horn is ON.
Outputs the microphone select signal.
High :
While using the HM-126.
Pin
Port
Description
number
name
4 - 6