Kenwood TK-90, Руководство по обслуживанию

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TK-90
32
1. Final Unit (X45-3780-20)
Ref. No. Use / Function Operation / Condition
IC1 AVR 8V for digital circuit
IC2 AVR 8V for analogue circuit
IC3 Extended I/O LPF control signal (Serial
→
Parallel)
Q1 Amplifier Pre-drive amplifier
Q2,3 Amplifier Drive amplifier
Q4,5 Amplifier Final amplifier
Q6 Bias control Final (Q4,5) stage bias current control
Q7 Switching 14S
Q8 Switching Q7 gate bias control
Q9 Driver Transmission/reception relay (K1)
control
Q10~13 Driver LPF changeover relay control
D1,2 Temperature Final (Q4,5) stage bias current
compensation control
D3 Surge absorption Antenna
D6 High-frequency Reflected wave detection
rectification
D7 High-frequency Forward wave detection
rectification
D8 Surge absorption Power supply surge protection
D9 Surge absorption ANT changeover relay
D101 Surge absorption Relay (K102)
D201 Surge absorption Relay (K202)
D301 Surge absorption Relay (K302)
D401 Surge absorption Relay (K402)
D501 Surge absorption Relay (K502)
D601 Surge absorption Relay (K602)
D701 Surge absorption Relay (K702)
2. Display Unit (X54-3560-20)
Ref. No. Use / Function Operation / Condition
IC1 AVR 5V for display circuit
IC2 AND gate Buffer
IC3 MCU Panel microcomputer
IC4 LCD driver
IC5 Reset IC Reset signal for ECU
Q2 Switching Backlight control
Q4 Switching 8D switch control
Q5 Switching 8D switch
Q6,7 Switching Surge prevention
COMPONENTS DESCRIPTION /
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