Kenwood TS-2000, Service Manual

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28
TS-2000/X
Ref. No. Use / Function Operation / Condition
IC17 Extended I/O Q0 : H when UHF ATT is on
Q1 : H when VHF ATT is on
Q2 : H when HF/50MHz ATT is on
Q3 : L when external RX antenna
terminal is selected
Q4 : L when HF/50MHz preampli-
fier is selected
Q5 : H when RX 1st IF 75.925MHz
is selected
Q6 : H during AM TX
Q7 : H during TX in PKD and 9600
bps is selected
Q8 : H during TX in non-FM mode
Q9 : H during RX in non-FM mode
Q10 : H when linear amplifier usage
is selected in HF or 50MHz band
Q11 : H when linear amplifier usage
is selected in either band
IC18 OP amplifier A/2 : 5V voltage source
B/2 : Amplifier 455kHz
IC19 OP amplifier A/2 : VSR voltage amplifier
B/2 : VSF voltage amplifier
IC601 DDS RX 4th local oscillator (467kHz)
IC602 DDS TX 1st local oscillator (10.595MHz)
IC603 DDS RX 3rd local oscillator (11.150MHz)
IC604 Inverter Polarity inversion
IC605 AVR 14S
→
8V
IC801 CPU Display microcomputer
D1 Surge absorption Relay (K1)
D2 Surge absorption External RX antenna terminal
D3 Surge absorption Relay (K2)
D4~6 Surge absorption Internal circuit protection
D7 Switching RX/TX changeover, on during RX
D8 Switching On when RF BPF under 1.705MHz
is selected
D9 Surge absorption Internal circuit protection
D10 Switching On when RF BPF under 1.705MHz
is selected
D11 Switching On when RF BPF over 1.705MHz
is selected
D12,13 Switching On when RF BPF of 1.705~2.5MHz
is selected
D14,15 Switching On when RF BPF of 2.5~4.1MHz
is selected
D16,17 Switching On when RF BPF of 4.1~6.9MHz
is selected
D18,19 Switching On when RF BPF of 6.9~7.5MHz
is selected
Ref. No. Use / Function Operation / Condition
D20,21 Switching On when RF BPF of 7.5~10.5MHz
is selected
D22,23 Switching On when RF BPF of 10.5~13.9MHz
is selected
D24,25 Switching On when RF BPF of 13.9~14.5MHz
is selected
D26 Switching RX/TX changeover, on during TX
D27,28 Switching On when RF BPF of 14.5~21.5MHz
is selected
D29,30 Switching On when RF BPF of 21.5~30MHz
is selected
D31,32 Switching On when RF BOF of 30~49MHz
and 54~60MHz is selected
D33,34 Switching On when RF BPF of 49~54MHz is
selected
D35,36 Switching On when ~60MHz preamplifier is on
D38,39 Switching On when ~21.5MHz preamplifier is on
D40 Switching HF/50MHz LO1 TX/RX changeover
D41,42 Switching RX 1st MCF changeover
D45 Switching HF/50MHz LO2 changeover
D46 Switching HF/50MHz and VHF/UHF band RX
IF input changeover, 10.695MHz
D47 Switching 1.2GHz RX IF input changeover,
10.695MHz
D48 Reverse current Main RBK and NB mute signal
prevention matching, main side mute when on
D49 Switching 10.695MHz IF filter changeover,
on when wide (6kHz) is selected
D50 Switching 10.695MHz IF filter changeover,
on when narrow (2.7kHz) is selected
D52 Switching 10.695MHz IF filter changeover,
on when through is selected
D53 Switching 10.695MHz IF filter changeover,
on when narrow (2.7kHz) is selected
D55 Switching 10.695MHz IF filter changeover,
on when wide (6kHz) is selected
D56 Switching 10.695MHz IF filter changeover,
on when through is selected
D57 Switching 10.695MHz IF filter changeover,
on when wide (6kHz) is selected
D58 Switching 10.695MHz IF filter changeover,
on when narrow (2.7kHz) is selected
D60 Switching 10.695MHz IF filter changeover,
on when through is selected
D61 Switching 10.695MHz IF filter changeover,
on when wide (6kHz) is selected
D62 Switching 10.695MHz IF filter changeover,
on when narrow (2.7kHz) is selected
DESCRIPTION OF COMPONENTS