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
From the
battery
RF UNIT
LOGIC UNIT
Regulator
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.
Q4, D6, D7
VCC
SW5V
Regulator
"PWRON"
IC12
CPU5
Logical circuits;
CPU (IC8),
Reset IC (IC21),
EEPROM (IC7), etc
Description
SW5V
Q22
T5V
Regulator
"T5C"
Q21
R5V
Regulator
Q54
"R5C"
PS5V
Regulator
"PS5C"
74 73 58
45
CPU
(IC8)
Pin Pin
I/O
No. Name
57 DASTB
OUT
OUT
58 T5C
OUT
59 TXC
OUT
61 UNLK
OUT
63 PLLSTB
64 PLPS
IN
65 PLLDATA Data signal to the PLL IC.
IN
66 PLLCK
IN
68 PLLSW
IN
69 PSVCO
IN
70 CHGIH
IN
71 CHGC
IN
74 PS5C
OUT
IN
IN
77 SI
IN
78 OPSD
IN
79 ESCK
IN
IN
81 OPV1
IN
82 OPV2
OUT
83 OPV3
OUT
87 DCIN
OUT
88 LVIN
OUT
90 SD
91 VIN
OUT
93 CTCIN
OUT
4 - 4
SW5V
COMMON;
PLL IC (IC19),
Q11
D/A converter, etc.
VCO5
VCO5
VCO and BUFFER amp.;
Regulator
VCO (Q76, D59−D61),
Buffers (Q5, Q74, Q75), etc.
"PSVCO"
T5V
TRNSMITTER CIRCUITS;
Pre-driver (Q3), etc.
R5V
RECEIVER CIRCUITS;
IF IC (IC2), 1st mixer (Q13),
1st IF amp. (Q14), etc.
PS5V
FOR POWER SAVE MODE;
APC amp. (IC26),
tone amp. (IC26), etc.
69
RF UNIT
Description
Strobe signal to the D/A converter.
T5 line control signal to the T5 regulator.
"Low"=While transmitting.
Transmit mute signal to the TX switch.
"Low"=While TX muting.
PLL unlock signal.
"Low"=PLL is unlocked.
Strobe signal to the PLL IC.
PLL IC power save mode switching signal.
"Low"=While in power save mode.
Clock signal to the PLL IC.
PLL loop fi lter characteristic toggle signal.
"High"=While the PLL is kicked-up.
VCO regulator control signal.
"Low"=While Vco is activated."
Charger circuit (High) control signal.
"High"=While charging.
Charger circuit control signal.
"High"=While charging.
Power save line control signal to the PS5V
regulator.
"Low"=While power save mode.
External MIC key (A/D) input.
"High"=While the key is pushed.
Data signal to the attached optional unit.
Clock signal to the EEPROM.
Scramble unit detection signal.
"Low"=DTMF unit is attached.
Optional unit attachement detection signal.
"Low"=DTMF unit is attached.
DTMF unit detection signal.
"Low"=DTMF unit is attached.
External power supply's voltage detection.
Lock voltage.
"SD" signal (RSSI signal).
Remining battery voltage detection.
DTCS and CTCSS signals.
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