TK-90
40
Ref. No.
Use / Function
Operation / Condition
D601,602
Reverse current
Audio AGC
prevention
D603,604
Attenuator
VOX voltage control
D605,606
Reverse current
Audio AGC
prevention
D607,608
Reverse current
Mute circuit
prevention
D609,610
Varistor
Surge prevention
D611,612
Poly-switch
Current limit
D613,614
Varistor
Surge prevention
D701,702
Variable
VCO oscillation frequency variance
capacitance diode
D703
Reverse current
Unlock signal
prevention
D704
Switching
ON when VCO1 is selected
D705
Switching
ON when VCO2 is selected
D851,852
Varistor
Surge prevention
D853
Poly-switch
Current limit
D854
Varistor
Surge prevention
D855,856
Limiter
Over input protection
D857
Varistor
Current limit
D858,859
Reverse current
Low active
prevention
D860
Limiter
Over input protection
D861
Reverse current
Low active
prevention
D862,863
Varistor
Surge prevention
D864
Limiter
Over input protection
D865~867
Varistor
Surge prevention
D868
18V zener diode
Voltage shift
D869
Reverse current
EEPROM writing time
prevention
D870
Reverse current
Frequency select
prevention
D871
Reverse current
Surge prevention
prevention
D872
Limiter
Surge prevention
D991,992
Reverse current
FAN
prevention
COMPONENTS DESCRIPTION /
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