Components Description - Kenwood TH-D72A Service Manual

TH-D72A/D72E
TX-RX unit (X57-784X-XX)
Ref. No. Use/Function
IC201 OP AMP
IC202 RF AMP
IC203 OP AMP
IC351 OP AMP
IC352 Analog switch
IC353 FM system
IC354 FM system
IC431 PLL system
IC512 DC/DC converter
IC513 PLL system
IC514 5.3V AVR
IC611 SUB MCU
IC639 Voltage detector
IC641 Charge
IC642 OP AMP
IC643 1.5V AVR
IC644 DC/DC converter
IC645 4.5V AVR
IC646 3.3V AVR
IC701 OP AMP
IC702 RS-232C driver
IC703 DC/DC converter
IC705 AVR
IC708,709 Analog switch
IC710 USB driver
IC712 OP AMP
IC713 Voltage detector
IC714 OP AMP
IC715 3.3V AVR
IC716 OP AMP
IC717 RTC
IC718 3.3V AVR
IC719 4.7V AVR
IC720 Analog switch
IC721 D/A converter
IC722 OP AMP
IC724 Flip-Flops
IC725 Comparator
IC726 Voltage detector
IC727 MCU
IC728 ASIC
IC730 EEPROM
16

COMPONENTS DESCRIPTION

Operation/Condition/Compatibility
APC
TX AMP
APC
AM AGC
AM/FM select
Band A
Band B
Band A
Charge pump for PLL
Band B
Charge pump
MCU
10V for DC/DC converter
Li-ion battery
Charge voltage/current detect
Charge
+B
45C
33CS
LCD
RS-232C COM port
LCD
AFB
MCU/TNC
USB
MIC AMP
INT
VOX AMP
33M
MIC limiter AMP
Real-time clock
33C
47C
RX band A/B
Signal level adjust
RX signaling
DIVIDER
A/D converter for TNC signal
Reset
TNC
TNC MODEM
Main memory
Ref. No. Use/Function
IC731 EEPROM
IC732 Comparator
IC733 OP AMP
IC734 AF power AMP
IC735 Analog switch
IC736 3.3V AVR
IC737 MCU
Q1 1st mixer
Q2 1st mixer
Q3 1st mixer
Q4 1st mixer
Q5 RF AMP
Q6 RF AMP
Q7 RF AMP
Q8 RF AMP
Q9 RF AMP
Q10 RF AMP
Q11 RF AMP
Q12 Switch
Q13 RF AMP
Q14 Switch
Q15,16 Switch
Q201,204 RF AMP
Q205 Switch
Q207 AMP
Q208 DC switch
Q209 DC switch
Q210,211 DC switch
Q212 DC switch
Q214 RF AMP
Q215 RF AMP
Q352 AMP
Q353 Switch
Q354 AMP
Q355 Switch
Q356 AMP
Q357 RF AMP
Q358 IF AMP
Q359 IF AMP
Q433 AMP
Q434 RF AMP
Q435 Oscillator
Q436~438 RF AMP
Operation/Condition/Compatibility
GPS log memory
A/D converter for TNC signal
TNC signal
SP output
9600bps mute
USB IC
Main
UHF band B
VHF band A
UHF band A
VHF band B
UHF band B
UHF band A
VHF band A
VHF band B
UHF band B
UHF band A
VHF band A
UHF AIP
VHF band B
UHF AIP
VHF AIP
Buffer
APC
APC
144T
430T
45TX
APC
TX drive AMP
TX fi nal AMP
AM
AM AGC
AM
AM AGC
AM
2nd local AMP
Band A
Band B
Ripple fi lter
Band A PLL
Band A VCO
Buffer