Digital Control Circuit - Kenwood TH-235A Service Manual

TH-235A/E/234 —
CIRCUIT DESCRIPTION
DIGITAL CONTROL CIRCUIT
@ Keys and rotary encoder circuit
The signals from the keys and rotary encoder are directly
input to the microprocessor as shown in Figure 8.
Encoder
—O —O —O —O
O 1S 2S 3 ? aS
bo bo b— bo)
I REttattacs:
5MS
p—O Oo -—O o>
~ EN TN TY
PO" r-ONG >—O P—O'
* 0 # D
TioP [eT [ o y
8 8 3/8! 8] & _
[ prt |
71 *
Ko3 ro)
af [won]
Ic201 Cy °L
MICROPROCESSOR 69 1 °
Kot ©
of
68
Koo re)
F
cal af
Fig.8 Keys and rotary encoder circuit