Kenwood TK-80 Service Manual page 29

TK-80
Ref. No. Use / Function
Q72 Switching
Q74 Switching
Q75 Switching
Q76 Switching
Q77 Switching
Q78 Switching
Q79 Amplifier
Q80,81 Switching
Q82,83 Switching
Q507 Amplifier
Q508~510 LPF
Q511 Amplifier
Q512 Buffer amplifier
Q513 Buffer amplifier
Q514 Buffer amplifier
Q515 Buffer amplifier
Q516 Buffer amplifier
Q517 Crystal OSC
Q518 Buffer amplifier
Q519 Buffer amplifier
Q520 Buffer amplifier
Q521 Amplifier
Q522 Buffer amplifier
Q523 Buffer amplifier
Q524 Amplifier
Q525 Crystal OSC
Q526 Buffer amplifier
Q527 Buffer amplifier
Q528 Buffer amplifier
Q529 Amplifier
Q530 Switching
Q531 VCO1
Q532 Switching
Q533 VCO2
Q534 Switching
Q535 VCO3
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COMPONENTS DESCRIPTION
Operation / Condition
TXB/RXB select switch
ON when TXB is Low
ON in AF mute
ON when power switch is OFF
AF mute/AM mode: ON
SSB/CW: ON
Amplification for sidetone
ON when PSK is Low
ON in low power or AT tune
LO1 (73.145~103.045MHz) output
Active LPF
19.5~49.5MHz PLL (IC502) input
19.5~49.5MHz
73.145~103.045MHz mixer
(IC503) input
D/A buffer, 1.195~1.695MHz
mixer (IC504) input
8.305~8.805MHz mixer (IC505) input
10MHz mixer (IC504) input
62.35MHz
62.35MHz
62.35MHz mixer (IC505) input
LO2 (62.35MHz) output
LO2 (62.35MHz) output
D/A buffer, 0.695MHz mixer
(IC506) input
10MHz mixer (IC506) input
CAR (10.695MHz) output
20MHz
20MHz
20MHz PLL (IC502) input
20MHz
20MHz DDS (IC500,501) input
VCO1 selection
73.145~83.544MHz
VCO2 selection
83.545~94.544MHz
VCO3 selection
94.545~103.045MHz
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Ref. No. Use / Function
Q536 Buffer amplifier VCO output 73.145~103.045MHz
Q800 Switching NB ON/OFF
Q801,802 Amplifier NB amplifier
Q803 Amplifier AGC for NB
Q804 Amplifier NB amplifier
Q805 Switching NB amplifier
Q806 Buffer amplifier NB amplifier
Q807,808 Switching NB amplifier
Q900 VOX amplifier MIC amplifier
Q901 Switching ON when IC901 10 pin is Hi
Q902 Switching VOX ON/OFF
Q903 Switching VOX input ON/OFF
D1~4 Lightning surge
absorption
D5,6 Switching ON in receive, OFF in transmit
D7,8 Switching ON in 100kHz~1.60499MHz
D9,10 Switching ON in 1.605MHz~2.49999MHz
D11,12 Switching ON in 2.500MHz~4.49999MHz
D13,14 Switching ON in 4.500MHz~7.99999MHz
D15,16 Switching ON in 8.000MHz~10.49999MHz
D17,18 Switching ON in 10.500MHz~14.49999MHz
D19,20 Switching ON in 14.500MHz~21.49999MHz
D21,22 Switching ON in 21.500MHz~29.99999MHz
D23,24 Switching ON when AIP is ON
D25,26 Switching ON when AIP is OFF
D27 Switching ON when MMU1 is ON
D28 Switching ON when packet using
D29 Switching AGC time constant
D30 Switching Switch for sending LO1 to the
transmit or receive mixer
D31 Switching Switch for sending LO2 to the
transmit or receive mixer
D32 Switching 10.695MHz filter select switch
D33 Switching ON in transmit
D34 Switching Transmit or receive selection
D35 Switching ON in receive
D36~43 Switching 10.695MHz filter select switch
D44 Reverse flow
prevention
Operation / Condition