Power Supply Circuits - Icom IC-V85 Service Manual

4-4 POWER SUPPLY CIRCUITS

DC voltage from the battery or external DC power supply is routed to whole circuit of the transciever via regulators.
• POWER SUPPLY CIRCUITS
Q9, Q10, Q18, Q19
Charger
From the
circuit
ext. DC power
VCC
From the
battery
RF UNIT
IC12
LOGIC UNIT
CPU5
Regulator
Logical circuits;
CPU (IC8),
Reset IC (IC21),
EEPROM (IC7), etc
Voltage line
Control signal
4-5 CPU PORT ALLOCATION
Pin Pin
No. Name
1 TONE Tone signals (DTMF/BEEP/1750Hz).
2 CTCSS Tone signals (CTCSS/DTCSS).
AF power amplifi er control signal.
4 AFON
"High"=While the AF poer amp. is activated.
AF line mute signal to the AF switch.
5 RMUTE
"Low"=While muting.
Clock frequency shift control signal to the
9 CSHIFT
clock oscillator.
CPU reset signal.
10 RESET
"Low"=CPU reset.
[PWR] Key.
16 PWRSW
"Low"=When the key is pushed.
17 NOIS "NOIS" signal.
Eexternal power supply connection detect.
18 DCC
"Low"=Powered by external DC.
Power supply detect.
19 HOUT
"Low"=Powered by battery.
Input signal from [PTT] key.
20 PTT
"High"=While the key is pushed.
Input signal from Key pads.
21−24 KR0−KR3
"Low"=When the key is pushed.
25 LEDC Backlight control signal to the LED driver.
33 DISDA Serial data to the LCD driver.
34 DISST Chip-enable signal to the LCD driver.
35 DISCK Serial clock signal to the LCD driver.
36 DISEN Disable signal to the LCD driver.
40 DICK
Pulse signal from [CONTROL DIAL].
41 DIUD
[MONI] key.
42 MONISW
"Low"=When the key is pushed.
45 PWRON Control signal to the power regulator.
Input signal from Key pads.
48−52 KS0−KS4
"Low"=When the key is pushed.
53 MICS AF fi lter switching signal.
MIC line mute signal to the AF switch.
54 MMUTE
"low"=While muting.
55 DADATA Data signal to the D/A converter.
56 DACK Clock signal to the D/A converter.
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Q4, D6, D7
SW5V
SW5V
Regulator
"PWRON"
Q54
PS5V
Regulator
"PS5C"
74
45
Description I/O
OUT
OUT
OUT
OUT
OUT
IN
IN
IN
IN
IN
IN
IN
OUT
IN
IN
IN
IN
IN
IN
IN
OUT
OUT
OUT
OUT
OUT
OUT
4 - 4
SW5V
Q11
VCO5
VCO5
Regulator
Q22
"PSVCO"
T5V
Regulator
"T5C"
Q21
R5V
Regulator
"R5C"
PS5V
73 58 69
CPU
(IC8)
RF UNIT
Pin Pin
No. Name
57 DASTB Strobe signal to the D/A converter.
T5 line control signal to the T5 regulator.
58 T5C
"Low"=While transmitting.
Transmit mute signal to the TX switch.
59 TXC
"Low"=While TX muting.
PLL unlock signal.
61 UNLK
"Low"=PLL is unlocked.
63 PLLSTB Strobe signal to the PLL IC.
PLL IC power save mode switching signal.
64 PLPS
"Low"=While in power save mode.
65 PLLDATA Data signal to the PLL IC.
66 PLLCK Clock signal to the PLL IC.
PLL loop fi lter characteristic toggle signal.
68 PLLSW
"High"=While the PLL is kicked-up.
VCO regulator control signal.
69 PSVCO
"Low"=While Vco is activated."
Charger circuit (High) control signal.
70 CHGIH
"High"=While charging.
Charger circuit control signal.
71 CHGC
"High"=While charging.
Power save line control signal to the PS5V
74 PS5C regulator.
"Low"=While power save mode.
External MIC key (A/D) input.
77 SI
"High"=While the key is pushed.
78 OPSD Data signal to the attached optional unit.
79 ESCK Clock signal to the EEPROM.
Scramble unit detection signal.
81 OPV1
"Low"=DTMF unit is attached.
Optional unit attachement detection signal.
82 OPV2
"Low"=DTMF unit is attached.
DTMF unit detection signal.
83 OPV3
"Low"=DTMF unit is attached.
87 DCIN External power supply's voltage detection.
88 LVIN Lock voltage.
90 SD "SD" signal (RSSI signal).
91 VIN Remining battery voltage detection.
93 CTCIN DTCS and CTCSS signals.
COMMON;
PLL IC (IC19),
D/A converter, etc.
VCO and BUFFER amp.;
VCO (Q76, D59−D61),
Buffers (Q5, Q74, Q75), etc.
T5V
TRNSMITTER CIRCUITS;
Pre-driver (Q3), etc.
R5V
RECEIVER CIRCUITS;
IF IC (IC2), 1st mixer (Q13),
1st IF amp. (Q14), etc.
FOR POWER SAVE MODE;
APC amp. (IC26),
tone amp. (IC26), etc.
Description I/O
OUT
OUT
OUT
IN
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
OUT
OUT
IN
IN
IN
IN
IN
IN
IN
IN