Kenwood TK-80 Service Manual page 28

Ref. No. Use / Function
IC7 Audio amplifier Audio power amplification
IC8 Switching Analog switch
IC9 MIC amplifier Amplification for MIC input
IC10 I/O port expansion Serial to parallel conversion
IC11 Regulator 8V→5V
IC12 Amplifier SWR power amplification
IC13 D/A converter Level control
IC14 Amplifier CAR, TGC voltage amplification
IC15,16 I/O port expansion Serial to parallel conversion
IC500,501 DDS
IC502 PLL 2,3,4: Divide ratio setting input,
5: Register select, 6: 19.5~49.5MHz,
9: Lock voltage output,
11: Unlock output, 15: 20MHz input
IC503 Mixer 2: 19.5~49.5MHz output,
5: 73.145~103.045MHz input,
7: 53.545~54.045MHz input
IC504 Mixer 2: 8.305~8.805MHz output,
5: 1.195~1.695MHz input,
7: 10MHz input
IC505 Mixer 2: 62.35MHz input,
5: 53.545~54.045MHz output,
8: 8.305~8.805MHz input
IC506 Mixer 3: 10.695MHz output,
5: 0.695MHz input, 7: 10MHz input
IC508 Switching Analog switch
IC900 Amplifier VOX, ANTI VOX amplifier
IC901 NOR circuit VOX level comparator
Q1 Switching TX: ON, RX: OFF
Q2,3 Switching TX: OFF, RX: ON
Q4~7 RX 1st mixer IF: 73.045MHz, RF: 100kHz~30MHz,
LO1: 73.145~103.045MHz
Q8,9 RF amplifier AIP OFF: ON
Q10 IF amplifier Amplification for IF frequency
73.045MHz
Q11,12 RX 2nd mixer IF1: 73.045MHz, LO2: 62.35MHz,
IF2: 10.695MHz
Q13 Amplifier LO1 amplification
Q14 Switching AIP ON: ON
Q15 Switching AIP ON/OFF select switch
COMPONENTS DESCRIPTION
Operation / Condition Ref. No. Use / Function
Q17 Switching AIP OFF: ON
Q18 Amplifier Buffer amplifier for NB noise amplifier
Q19 Amplifier IF2 amplification
Q20 Switching For NB
Q21 Amplifier 10.695MHz amplification for receive
Q22 Switching CKY H: ON
Q23 DC LPF ALC keying
Q24 Amplifier 10.695MHz amplification for transmit
Q25,26 TX 1st mixer LO2: 62.35MHz, IN: 10.695MHz,
OUT: 73.045MHz
Q27,28 TX 2nd mixer LO1: 73.145~103.045MHz,
IN: 73.045MHz, OUT: 100kHz~30MHz
Q29 Amplifier Drive amplifier for transmit
Q30,31 Amplifier IF amplifier for receive
Q32 Amplifier AF buffer amplifier for SSB, CW
Q33 RX IF buffer AM detection, AGC
amplifier
Q34 Amplifier AF buffer amplifier for AM
Q35 Amplifier AGC amplifier
Q36,38 Switching ON in receive
Q39 Amplifier AF amplifier for packet communication
Q40 Amplifier AF amplifier for selective call
Q46 Switching ON when BUSY is Hi
Q47 Switching VCA volume selection
Q48 Amplifier AF preamplifier
Q49 Switching AF mute
Q50 Amplifier Buffer for input to balanced modulator
Q51 Amplifier Amplifier for balanced modulator output
Q52 Switching ON in CW mode (MIC mute)
Q54 Amplifier Detection for MIC amplifier output
Q55~57 Switching DC/DC converter
Q58 Switching Linear amplifier control
Q59 Ripple filter Power supply for AF amplifier
Q60~62 Amplifier ALC amplifier
Q63 Amplifier SWR protection
Q64,65 Amplifier ALC amplifier
Q67 Switching ON in AM mode,
OFF while transmitting in AM mode
Q68,69 Switching ON while transmitting in AM mode
Q70,71 Switching ON when TXC is Hi
TK-80
Operation / Condition
27