Kenwood TH-F6A Service Manual page 15

Ref. No. DESCRIPTION NAME
D115 RF SW
D116 ATT SW B band 50 to 108MHz ON:receive
ATT on
D117,118 ANT SW
D119 ANT SW Q57 control SW
D120 ANT SW Q55 control SW
D121 reverse current protector
D122 voltage shift
D123 overvoltage protector
D124,125 overinput protector
D126 voltage shift
D702-704 Type setting diode
D705 AF rectification
D706-708 reverse current protector
D709 AF rectification
D710,711 overvoltage protector
D712-717 LED
D718 AGC SW
D719 reverse current protector
D720-725 LED
D726 constant-voltage circuit
D727 reverse current protector
D730-732 reverse current protector
Q1 constant-current circuit constant current charge
Q2 Charge control
Q3 Charge control constant potential charge
Q4 SW B band/transmission PLL charge
pump SW
Q5 Charge control
Q6 SW B band/transmission PLL VCO shift
SW
Q7 RIPPLE FILTER B band/transmission VCO power
supply
Q8 SW Prescaler divider SW
Q9 OSCILLATOR B band /transmission VCO
Q10 VCO power supply SW
Q11 RF AMP
Q12 RF AMP
Q13 BUFFER AMP
Q14 Power supply switch Prescaler power supply SW
Q15 SW Prescaler divider SW
Q17 SW Prescaler divider SW
Q19 RF SW B band local amp
Q21 RF AMP B band local amp
Q22 AF SW B band AF output SW
Q23 3rd local AMP 3rd local (crystal oscillator) buffer
amp
Q24 IF AMP B band W-FM
Q25 AGC AMP B band IF AGC DC amp
Q26 BUFFER AMP B band IF AGC amp (57.6MHz)
Q27 local AMP B band 2nd local (crystal oscillator)
buffer amp
DESCRIPTION OF COMPONENTS
Use/function
TH-F6A/F7E
Ref. No. DESCRIPTION NAME
Q28 MIXER B band
Q29 AF SW B band AF output SW
Q30 SW B band FM / W-FM power supply SW
Q31 RIPPLE FILTER A band VCO power supply
Q32 ANT SW Bar antenna switch
Q34 OSCILLATOR A band VCO oscillator
Q35 VCO power supply SW A band RX VCO power supply
switching
Q37 BUFFER AMP A band RX VCO output amp
Q40 RF AMP A band local amp
Q41 RF AMP A band mixer input amp
Q43 IF AMP A band 1st IF amp
Q44 RF AMP A band 2nd local multiplyng
Q45 MIXER A band
Q46 RF AMP B band 1.2GHz band 1st amp
Q47 APC SW APC control
Q48 ANT SW Bar antenna switch
Q49 APC controller APC control
Q50 AMP APC control
Q51 APC SW APC control
Q52 ANT SW Bar antenna switch
Q53 DC SW Bias control
Q54 RF AMP Pre-drive
Q55 RF AMP VHF/UHF final-amp
Q56 RF AMP Drive amp
Q57 RF AMP 220MHz band final-amp (K-type
only)
Q58 Power supply switch B band 2nd amp power supply
control
Q59 RF AMP Bar antenna 1st amp
Q62 RF AMP UHF 1st amp (A/B band)
Q63 RF AMP A band VHF 1st amp
Q64 RF AMP B band VHF 1st amp
Q65 DC IN DETECT SW DC-IN / battery
Q66 APC SW APC control
Q68 SW BPF SW
Q69 VCO switching VCO oscillator frequency shift SW
Q70 VCO switching VCO oscillator frequency shift SW
Q71 RF AMP Drive amp
Q72 RF AMP Pre-amp
Q73 BAND SW B band 50 to 108MHz On when RX
Q74 BAND SW B band 50 or less
Q76 RF AMP B band 50 to 108MHz On when RX
Q92 Power supply switch B band 1.2GHz band 1st amp
power supply SW
Q93 RF AMP B band local amp
Q94 RF SW PLL Fin filter SW
Q95,96 SW Final SW
Q97 RF AMP B band local amp
Q98 GAIN SW Bar antenna RF amp gain SW
Q99 DC SW Bias control
Q100 IF SW when bar antenna use : ON
Use/function
On when RX
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