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Pleas 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 checked) [Ref No. EC22]
Oscilloscope
status (voltage) of check points
This could be
defective point
pin 56
SRAM
0v
IC3
MODEM
0v
IC11
OPE.PANEL
5v
IC301
Thermal Head
5v
TEMP.
Cordless
0v
ALL OK
0v
or
TESTER
IC1 (ASIC)
pin 58
pin 60
0v
5v
5v
5v
0v
0v
0v
5v
5v
0v
0v
0v
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).
| 57 |
GND
Please check here!
IC3,IC1 (pin 48)
IC11 (pin 95, pin 116),RA1,RA2
IC1 (pin 14~17, pin 20)
R79~R86
R47~R49, C37~C39
IC1 ( pin 38, pin 49)
Note: If the thermal head temperature is
abnormal, "CALL SERVICE" will appear in
the dispaly.
Change the Cordless Base unit P.C.B.
KX-F910BX
AC
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