Kenwood TK-290 Service Manual page 27

TK-290
SEMICONDUCTOR DATA / DESCRIPTION OF COMPONENTS
2. RF Power Amplifier (Final Unit IC801)
M68776
2-1. Block diagram
1 2
2-2. Maximum ratings (Flange temperature = 25°C)
Rating
DC supply voltage (Pins 3)
DC control voltage (Pin 2)
RF input power
RF output power
Operating case temperature range
Storage temperature range
26
3 4
Symbol Value Unit
V 12 V
DD
Vcont 4 V
Pin 40 mW
Pout 10 W
°C
Tc –30 to +110
°C
Tstg –40 to +110
Final Unit (X45-3592-71)
Ref. No. Use / Function
IC801 RF power amplifier
Control Unit (X53-3930-XX) -11 : K -12 : K2
Ref. No. Use / Function
IC1 Audio power amplifier
IC2 Shift register
IC3 MIC noise canceling circuit
IC4 Option board (MAND)
control switch
IC5 Option board (OPPTT)
control switch
IC6 Option board (TCONT)
control switch
IC7 Shift register
IC10 Inverter
IC101 LCD driver
Q5 Power supply switch control AF AMP SW "H" : on
Q6 AF amplifier power
supply switch
Q7 Int. audio mute switch
Q8 Audio mute switch
signal off
Q14 Noise cancelling (N/C) switch
Q15 Ext. audio mute switch
D2 AVR
D6~9 Key pad backlight
D11 Reverse current prevention
for number key pad
D12,13 Reverse current prevention
for PF key.
D14 Reverse current prevention
for number key pad
D15,16 Reverse current prevention
for PF key.
D17,18 Reverse current prevention
for number key pad
D19,20 Reverse current prevention
for PF key.
D101 Speed up
D102,103 LCD backlight
D104 LED
Operation / Condition
Operation / Condition
0.5W/16Ω, BTL method
AND circuit
MAND : "H", OUT : "H"
when Q3 port is "H"
AND circuit
OPPTT : "H", OUT : "H"
when Q4 port is "H"
AND circuit
MAND : "H", OUT : "H"
when Q4 port is "H"
INT. AFC "H": INT. SP
audio signal on
MUTE "L" : RX audio
N/C switch "H" : N/C on
EXT AFC "H" : EXT. SP
audio signal on
AF AMP power supply
Red, green