Kenwood TH-22A Service Manual page 10

TH-22A/AT/E
CIRCUIT DESCRIPTION
DIGITAL CONTROL CIRCUIT
e Keys and rotary encoder circuit
The signal from keys and rotary encoder input to micro-
processer directly as shown in Figure 9.
Encoder
27
28
10
UP
DN
1C206
p-COM
KS INS KS IN4. KS IN3 KS IN2
20
PTT
KS IN 1
KOUT 3
KOUT 2
KOUT 1
KOUT 0
Fig. 9 Keys and rotary encoder circuit
PTT
SW
MON!
SW
LAMP
SW
TCT
sw
REV
SW