Panasonic KX-F900 Service Manual page 60

[
KX-F900
(5) CHECK WAVE FORM
This check needs 4 channels digital storage oscilloscope higher than 400 MHz.
I START ]
NO
JYES
I heck again power line,
oscillation (12 MHz),
RESET?
j
NO
Address to SRAM or
MODEM may unsuceedo
(Refer to pages 63-65)
If still no reaction replace
ASlC and check again.
__ o0a0e6
._ Active term o, _ -_-6-E_n_ ,_ent,y_'_L
l 1 no problem
Check operation panel I/F
Check the lines that connect to CN5
from ASlC (IC1).
If no problem on the lines replace
ASIC (ICl).
Address to SRAM or
MODEM may unsuceed.
]
Refer to pages 63~65. /
/
Watch dog error frequently
makes RESET active because
address or data is confused
by any problem on Address,
Data bus.
Check bus line
• short circuit
• open
• voltage
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