Kenwood TS-2000 Service Manual page 27

Ref. No. Use / Function
Q94,95 Buffer amplifier Buffer amplifier for ANO output of
main and sub band
Q96 Switching External squelch output of main
and sub bands (open collector)
Q97 DC buffer amplifier Ripple filter for AF IC (IC9) power supply
Q101~112 Switching On when RF BPF SW is selected
Q601 Amplifier 31.2MHz
Q602 Buffer amplifier RX 4th local oscillator (467kHz)
Q603 Amplifier 31.2MHz
Q604 Buffer amplifier TX 1st oscillator (10.595MHz)
Q605 Amplifier 31.2MHz
Q606 Buffer amplifier RX 3rd local oscillator (11.150MHz)
Q607,608 Switching On when 1st IF frequency is 69.085MHz
Q609 Switching DC switch
Q700,701 Mixer RX 3rd mixer and 3rd IF frequency
(455kHz)
Q702 Switching Gain correction, on when RX 1st IF
is 69.085MHz
Q703 Switching L69 tuning correction, on when RX
1st IF is 69.085MHz
Q704 Switching On during TX in FM mode
Q705 Amplifier On RF amplifier is 21.5~60MHz
Q706~708 Switching On at time of Q705 operation
Q709 Buffer amplifier 455kHz
Q710 Amplifier Squelch noise amplifier
Q711 TX 2nd IF amplifier 10.695MHz
Q712,714 Switching On during TX in FM mode
Q715 Amplifier DRU output amplifier
Q800 Switching On when FUNC switch is selected
Q801 AVR For LED
Q802 Switching On in main band TX mode
Q803 AVR For LED
Q804 Switching On when main band BSY
Q805 AVR For LED
Q806 Switching On in sub band TX mode
Q808 Switching On when sub band BUSY
Q811 Switching On when modem 9600 bps is selected
Q813 Switching On when modem STA is active
Q815 Switching On when a modem is connected
Q817 Switching On when MULTI ENC is sctive
Q819 Switching On when sub receiver is on
Q820,822 Switching On when key illumination is on
Q951 Switching Reset control
IC1 FM IF
IC2 OP amplifier
B/2 : FM AF amplifier
IC3 Mixer
DESCRIPTION OF COMPONENTS
Operation / Condition
IF amplifier, Squelch
A/2 : ALT voltage buffer
RX 4th mixer (Output : 12kHz)
Ref. No. Use / Function
IC4 OP amplifier
IC5 Extended I/O
IC6 Mixer
IC7 Multiplexer
IC8 Analog switch
IC9 AF PA
IC10 Level converter
IC11 Buffer amplifier
IC12 OP amplifier
IC13 OP amplifier
IC14 DAC
IC15 DAC
IC16 Extended I/O
TS-2000/X
Operation / Condition
A/2 : Unused
B/2 : AGC reference voltage buffer
RF BPF changeover control
TX 1st mixer (Output : 10.595MHz)
Receiver output, FM (AF) and non-
FM (IF) changeover
Modulation input, FM (AF), non-FM
(IF) and packet (AF) changeover
Main and sub 2 channels
RS-232C level and 5V conversion
Voltage buffer
1/4 : TX power gain control voltage buffer
2/4 : Unused
3/4 : RX IF gain control voltage buffer
4/4 : TX band gain control voltage buffer
A/2 : ALC reference voltage buffer
B/2 : ALC meter voltage buffer
1/8 : TX power control voltage
2/8 : ALC reference voltage
3/8 : Unused
4/8 : Protection voltage
5/8 : TX power gain control voltage
6/8 : Unused
7/8 : TX band gain control voltage
8/8 : RX IF gain control voltage
1/8 : HF/50MHz TX BPF control voltage
2/8 : RF unit RX sub BPF control voltage
3/8 : RF unit RX main BPF control voltage
4/8 : RF unit TX UHF BPF control voltage
5/8 : H in non-FM mode
6/8 : Unused
7/8 : Unused
8/8 : NB level control voltage
Q0 : L when RX 10.695MHz XF5 is
selected
Q1 : L when RX 10.695MHz XF6 is
selected
Q2 : L when RX 10.695MHz
through is selected
Q3 : L when AT tuning
Q4 : L when RX 455kHz CF1 is selected
Q5 : L when RX 455kHz CF2 is selected
Q6 : L when RX 455kHz CF3 is selected
Q7 : Reserved
Q8 : Reserved
Q9 : Unused
Q10 : H when main squelch is open
Q11 : H when sub squelch is open
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