Kenwood TK-863G Service Manual page 26

TK-863G
Ref. No. Use/Function
Q17 AF mute
Q18 DC switch
Q19,20 DC switch
Q21 DC switch
Q22 RF amplifier
Q23 DC switch
Q24 AF mute
Q25 RF amplifier
Q26 Inverter
Q27 RF amplifier
Q28 DC switch
Q29 DC switch
Q31 APC controller
Q32 APC controller
Q33 APC controller
Q34 L.N.A.
Q35 W/N switch
Q36 DC switch
Q37 AF mute switch
Q38 DC switch
Q501 Clock switch shift
Q502 AF mute
26
DESCRIPTION OF COMPONENTS
Operation/Condition
Active while AF mute is active
8R, active while RX
SB switch, active when power up
Active while PS voltage is more
than 20V
SB switch, active hwile power on
Active while power switch is off
Predrive
Active while power switch is low
Drive
8T, active on TX
8T cont, active on TX
DB
Power protection
Active on narrow
Power protection
Inactive on mute
5S
Clock shift is active while
BSHIFT is H
Active while MUTE is H
Ref. No. Use/Function
Q503 Inverter
Q504 LED switch (Red)
Q505,506 Key backlight switch
Q508 LED switch (Green)
Q509 MIC mute
PLL/VCO (X58-4670-17)
Ref. No. Use/Function
D101 RX VCO
D102 TX VCO
D103 RX VCO
D104 TX VCO
D105 Modulation
Q101 Oscillator
Q102 Inverter
Q103 Oscillator
Q104 TX/RX switch (TX)
Q105 TX/RX switch (RX)
Q106 Buffer amplifier
Operation/Condition
Active while PA2 is H,
public address is active
Active while LED0 is H,
TX is active
Active while MBL is H
Active while LED1 is H,
RX is active
Active while MM is H and MM2 is H
Operation/Condition
RX
Active while ST is H
TX
Active while ST is H
Active while Q102 is off