Panasonic KX-F900 Service Manual page 57

KX-F900 j
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 or TESTER
IO
DDDDD
[] m 0 0
AC
This could be
defective point
SRAM
IC3
MODEM
ICll
OPE.PANEL
IC301
Thermal Head
TEMP.
Cordless
ALL OK
status (voltage) of check points
IC1 (ASIC)
pin 56
0v
0V
5v
5v
0V
0v
pin 58 pin 60
0v 5v
5v 5v
0v 0v
0v 5v
5v 0v
0v 0v
Please check here!
R68,R69
IC3,1C1 (pin 48)
IC11 (pin 95, pin 116),1C11 ,L2.,L5,RA1 ,RA2
R39,C87
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.
-I
O
C:
I--
Ill
co
"1-
O
O
-I
z
¢)
c
Ill
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).
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