Kenwood TK-230 Service Manual page 33

CIRCUIT DESCRIPTION
1. Signaling Unit
KEY BOARD
LCD 12 Seg. 8 Figures |
sued —
Ic4
PL
|
Q1 vec LAMP2
C5 > RESET
a _
te TONEC
aa
TO
TONER
onl s
csi,CS2 A
[[—
Riera
Sk,dTDO
LAMPI
KEY MATRIX
Ic2
ice | |
L_—_tJ LJ
Ics} | 1c7 |
L
Fig. 13 Signaling system
trol Units
* Operation during POWER on
CHANNEL/GROUP
PRIORITY DISPLAY
DTMF MONI/MIC MUTE CONTROL
DEL/ADD CONTROL DISPLAY
DATA CALL
DATA
|
| —
START BIT
STOP BIT
|
is DATA '
1200 BPS
Oe
KSI _
SIGNALING
*1
CONTROL
UNIT
_
KSQ
UNTT
ed
Fig. 14
35