Description Of Components - Kenwood TS-B2000 Service Manual Supplement

FINAL UNIT (HF) (X45-360X-XX) (A/2)
Ref. No. Use / Function
Q1,2 Predrive amplifier
Q3,4 Drive amplifier
Q6,7 Final amplifier
Q8 Bias control
Q101,102 Final amplifier
Q103 Bias control
Q201 Switching
Q202 Switching
Q203 Switching
Q204 Switching
Q205 Switching
Q206 Switching
Q207 Switching
Q208~215 Switching
Q216,217 Switching
Q218 Switching
IC201,202 AVR
IC203 AVR
IC204 AVR

DESCRIPTION OF COMPONENTS

Operation / Condition
HF/VHF band amplifier
HF/VHF band push-pull wide-band
amplifier
HF/50MHz band push-pull wide-
band amplifier
HF/50MHz band final stage bias
current control
VHF band push-pull wide-band
amplifier
VHF band final stage bias current
control
ANT1 and ANT2 changeover relay
control
AT relay control
HF RX antenna relay control
Fan control (high speed)
Fan control (low speed)
High power supply voltage protection
Power relay control (K201)
HF/50MHz band LPF band changeover
VHF band TX/RX changeover relay
control
Drive stage bias current control
SB→8V
SB→10V
8V→5V
TS-2000/X,TS-B2000
Ref. No. Use / Function
IC205 Extended I/O
IC801 Extended I/O
IC802 Extended I/O
IC803 Extended I/O
D1 Switching
D2,3 Temperature
compensation
D5 Switching
D6 Surge absorption
D7,8 Temperature
compensation
D101 High-frequency
rectification
D102 High-frequency
rectification
D103,104 Temperature
compensation
D201 Surge absorption
D202 Surge absorption
D203 Zener diode
D204 Surge absorption
D206~209 Surge absorption
D210 Reverse current
prevention
D211 Zener diode
D801~824 Surge absorption
Operation / Condition
LPF control signal serial-parallel
AT input C control signal serial-parallel
AT output C control signal serial-parallel
AT coil control signal serial-parallel
HF/VHF band drive input changeover
Drive stage bias current control
HF/VHF band drive stage bias changeover
Relay (K1)
HF/50MHz band final stage bias
current control
VHF band reflected wave detection
VHF band forward wave detection
VHF band final stage bias current
control
Power surge protection
Fan
Over voltage detection
Relay (K201)
IC205 output line protection
VHF band TX/RX relay control line
Voltage detection
Antenna tuning relay (K801~824)
3