Kenwood TK-80 Service Manual page 30

Ref. No. Use / Function
D45 LED
D47 Reverse flow
prevention
D48 PIN diode
D49 Reverse flow
prevention
D50,51 Switching
D52,53 Detection
D54 Detection
D55 Detection
D56 Switching
D59 Detection
D60,61,63 Reverse flow
prevention
D64 Rectification
D65 Zener diode
D66 Surge absorption Protect for transistor of linear
D67 LED
D68 Zener diode
D69,70 Reverse flow
prevention
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COMPONENTS DESCRIPTION
Operation / Condition
Voltage limiter
Diode of 10.695MHz level variability
ON in transmit
SSB, CW envelope detection
AM envelope detection
AGC squelch detection
ON in transmit
Detection of MIC amplifier output
DC/DC converter
For constant voltage
amplifier control
Voltage limiting
3.6V voltage shift
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Ref. No. Use / Function
D71 Zener diode 12V voltage shift
D72,73 Reverse flow
prevention
D75 Zener diode Reduce the output power when
power supply voltage drop
D76,79 Reverse flow
prevention
D80 Zener diode Reduce the output power when
power supply voltage drop
D81~87 Reverse flow
prevention
D88 Zener diode Over voltage protection
D500,501 Switching DDS register selection
D502 Vari-cap VCO1
D503 Switching VCO1 output
D504 Vari-cap VCO2
D505 Switching VCO2 output
D506 Vari-cap VCO3
D507 Switching VCO3 output
D800 Detection Noise detection
D900~902 Reverse flow
prevention
TK-80
Operation / Condition
29