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KX-F680BX/KX-F2681BX
START
NO
Check again power line,
oscillation (12 MHz),
RESET?
If still no reaction replace
ASIC and check again.
Any wave form on the line .
(AD, D0, ROMCE, RD)
Does wave form on A0, D0,
ROMCE, RD seem to good?
Active term of ROMCE is
longer than normal?
Is RESET coming frequently?
(every 4 msec)
Watch dog error frequently
makes RESET active because
address or data is confused
by any problem on Address,
Data bus.
Check bus line
Address to SRAM or
MODEM may unsuceed.
Address to SRAM or
MODEM may unsuceed.
(Refer to pages 63~65)
Check operation panel I/F
Check the lines that connect to CN5
from ASIC (IC1).
If no problem on the lines replace
ASIC (IC1).
Refer to pages 63~65.
RESET is
no problem
NO
short circuit
open
voltage
Refer to page 61
Refer to page 62
YES
YES
YES YES
NO
NO
(5) CHECK WAVE FORM
This check needs 4 channels digital storage oscilloscope higher than 400 MHz.
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