Kenwood TM-V7A Service Manual page 24

TM-V7A/E
24
DESCRIPTION OF COMPONENTS
Ref No. Use/Function Operation/Condition/Compatibility
Q61 Transmission driver 144M reception
Q63 Noise amp 430MHz
Q66, 67 APC control
Q69 Power switch
Q71 Power switch control
Q73 RD buffer 144MHz
Q74 RD buffer 430MHz
Q75 FAN switch
Q76 Constant voltage circuit 10V
Q77 Switch Overvoltage protection
Q78 Constant voltage circuit 10V
Q81 Temperature protection switch
Q91 Switch AM select
Q501 Back up switch
Q504 5C feed switch
Q505 MIC RD buffer amp
Q506 9600bps RD buffer amp
Q507 MIC RD mute
Q508 1200bps RD buffer amp
Q509 Reset switch
IC4 AF amplification
IC2 8V AVR
IC3 VHF band transmission driver
IC4 UHF band transmission driver
IC6 PLL frequency synthesizer 430MHz
IC7 PLL frequency synthesizer 144MHz
IC8 Analog switch 430MH2z Ioop filter switching
Ic9 Analog switch 144MHz loop filter switching
IC10 VCO-PLL
IC11 Frequency divider (prescaler)
IC12 VCO-PLL
IC13 Second local oscillation, mixer, IF amplification, detection,
low-frequency amplification, noise amplification,
noise detection, squelch switching
IC14 Multiplexer
IC15 Second local oscillation, mixer, IF amplification, detection,
low-frequency amplification, noise amplification,
noise detection, squelch switching
IC16 APC conirol
IC17 5V AVR
IC18 Multiplexer
IC19, 20 Serial-parallel conversion
IC501 6V AVR
IC502 5V AVR
1C503 Cross point switch
IC504 Electronic control
IC505 Reset IC
IC506 DTMF decoding
IC507 Mic amp, tone decoding
IC508 MPU
IC509 Analog switch
IC510 Cross point switch