Kenwood TH-22A Service Manual

TH-22A/AT/E
DESCRIPTION OF COMPONENTS
Ref.
No.
Use/Function
Operation/Condition/Compatibility
Q215
Differential
DC
amplifier
Q213
output control
Q216
Differential
DC
amplifier
Q214
output control
Q217
3T
SW
Q218
3C SW
Q219
3R
SW
3R
output
control
Q220
Reset
circuit
Q221
Mute
switch
Mute
switch,
"H”:
Receive
audio
signal
On
Di
Quick
charge
3C
ripple
filter
D3
Waveform
shaping
D4
Startup
diode
{C2
voltage
generater
circuit
D7
DC
SW
On
in
transmit
mode
D8
RF
SW
On
in
transmit
mode
D9
RF
SW
On
in
transmit
mode
D11,D12
Transmission/reception
changeover
switch
{
On
in
transmit
mode;
Off
in
receive
mode
D13,
014,
B15
Receive
shift
DI6
Noise
rectification
Di7
Reverse-flow
prevention
Di8
Constant-voltage
circuit
D20
Power module
protection
diode
D202
Constant-voltage
circuit
D204,
D205
LED
LAMP
D206-D216
Reverse-flow
prevention
D217
LED
ON
AIR
D218
Constant-voitage
circuit
AF
amplifier
power
supply
D220
Quick
discharge
VCO unit (X58-4090-00)
Ref.
No.
Use/Function
Operation/Condition/Compatibility
Qi
Transmission/reception
changeover
switch
|
Transmission/reception
changeover
switch,
"L”:
Receive
frequency
Q2
Oscillation
amplifier
Q3,
Q4
Buffer
amplifier
Di,
D2
VCO
frequency
control
D3
Modulation
D4
Frequency
shift
23

Kenwood TH-22A Specifications

General

Brand	Kenwood
Model	TH-22A
Category	Transceiver
Language	English