Panasonic KX-FT21BX - Digital Board Troubleshooting; Digital Board Section Overview

TROUBLESHOOTING GUIDE
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KX-FT21LA
Digital Block Diagram
TO
CIS
TO
THERMAL HEAD
CLK, SIG
STBI-2,THLAT
THCLK,THDAT
5V
(IC4)
RESET
BACK UP
ROM (IC2)
A0-17
D0-7
RD
KSTART,KLATCH,KSCLK,KTXD,KRXD,KIN0,KIN1,KIN2,KIN3
RS,E
VOL
HEAD-CTL
XWDERR
RD
WR
XRESETI
A0-17
D0-7
CIS-CTL
LED ON
ASIC
IC1
32.768KHz
20.736MHz
24MHz
T0,T2~T5
(IC7)
MOTOR
DRIVER
TO
MOTOR
TO
OPE PANEL
RX
SP
H/S RX
H/S TX
TX
RXIN
TXOUT
ANALOG FRONT END (IC5)
ANALOG SW
(IC6)
TO ANALOG
SRAM (IC3)
A0-17
D0-7
RD
WR
IC7
+5V
+24V
Q13
24V
TH ON
I/O
ANALOG PORT CONTROL
TO SRAM (IC3)