Kenwood TK-90, Руководство по обслуживанию

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TK-90
34
Ref. No. Use / Function Operation / Condition
IC423 OP amplifier Buffer for S-meter voltage
IC451 Mixer IC Demodulator
IC452 Multiplexer Detect signal select
IC453 OP amplifier Detect signal buffer
Ref voltage
IC454 5V AVR For analogue circuit
IC521 AF amplifier Audio amplifier
IC551~553 Analog switch Audio signal select
IC554 A/D Electrical volume
1: DEO output
2: No use
3: MOD signal
4: AM AGC
5: Anti VOX level
6: DI level
7: MIC sense
8: VOX sense
IC555 A/D Electrical volume
1: Audio output level
2: Beep level
3: Side tone level
4: Emergency tone level
5: VGS-1 monitor level
6: VGS-1 signal for DEO
7: Reserved
8: No use
IC601 NOR VOX control
IC602 OP amplifier AGC amplifier for MOD
IC603 OP amplifier For VOX function
IC604 DI amplifier Amplifier for DI/VOX
IC605 MIC amplifier Amplifier for MIC/ANTI VOX
IC606 Buffer Buffer for UART signal
IC701 DDS LO1-PLL reference signal is generated
IC702 DDS CAR signal generation
IC703 PLL LO1 control
IC704 5V AVR For PLL circuit
IC851 Analog switch RTK control switch
IC852 OP amplifier Buffer for DEO signal
IC853 5V AVR 5V for VGS-1
IC854 EEPROM EEPROM
IC855 MCU Main microcomputer
IC856 Reset IC CPU reset signal
COMPONENTS DESCRIPTION /
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