Panasonic KX-FT21BX - Page 95

TROUBLESHOOTING GUIDE
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KX-FT21LA
0V
5V or 3.3V
Approx. 0 or 1 V
ASIC
RA
SRAM
0V
IC1
1.
2.
3.
IC3
Chip
470
Solder waste
Solder ball
Short circuit from the adjacent signal wires.
Check for a short circuit in the RA and IC leads and the signal wire
at the through hole.
Short between the signal line and GND.
OR IC malfunction
Solder fault on RA.
NG Example
Through hole