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TROUBLESHOOTING GUIDE
KX-F680BX/KX-F2681BX
This could be
defective point
Please check here!
AC
status (voltage) of check points
TESTEROscilloscope or
IC1 (ASIC)
pin 58pin 56 pin 60
0v0v 5v
5v0v 0v
5v0v 5v
0v5v 0v
0v0v 0v
SRAM
IC3
Flash Memory
IC4
MODEM
IC5
OPE.PANEL
IC301
R68,R69
IC3,IC1 (pin 48)
R63,R64,IC4
IC1 (pin 12, pin 13, pin 106,~108, pin 120)
IC1 (pin 116),IC5,RA1,RA2,X3,L2,L3
R23,C31,C32,C33
IC1 (pin 14~17, pin 20)
R79~R86
0v5v 5v
Thermal Head
TEMP.
R47~R49, C37~C39
IC1 ( pin 38, pin 49)
Note: If the thermal head temperature is
abnormal, "CALL SERVICE" will appear in
the dispaly.
Please check soldering and conduction of these components.
If it is no problem, replace ICs.
If you still have problem, please go to "3-1 check detail" (page 58).
ALL OK
GND
Please check the status (voltage) of pin 56, pin 58 and pin 60 of IC1.
These status may tell you defective point. (Please use the ROM for IC status checkedin place of the original ROM(IC2)
[Ref No. EC22]
After checking, confirm that the status check ROM is replaced with the original ROM.
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