Panasonic KX-B620 Service Manual page 17

Power indicator LED off ——@®
SYMPTOM
Key input is rejected ®
Paper out LED doesn't
work —
Screen feed problem O
Paper feed problem —_——-©
Fluorescent lamp
. problem
Screen sensor problem
@
oO Screen feed problem
Mechanical
problem
must
be checked
first.
ls the installed
condition
of the motor
and gear correct?
Next check the inputs and the outputs of
motor driver 1C104.
KX-B620 Series
KX-B520 Series
Screen sensor problem :
First check the screen condition.
If it is loose, the screen sensor.sometimes
can't sense the screen home position.
lf the screen is scrolling without
stopping, check the position of tension
spring screws located the left side of the
panel.
Power indicator LED off
Check +5V —> Check
power MAIN
source. unit.
Check the —> Replace it.
operation
panel and
cable.
Key input is rejected.
Check +5V — Check
power - MAIN
source. unit.
Check the — Check the
input from operation
this key to panel and
CPU. -cable.
Check the — Replace
reset signal. 10101.
Isit "H"?
Check the -> Replace
clock pin 40 10103.
of CPU.
Check the -> Replace
INT signal 10103.
pin 2 of
1C102.
Replace 1C102.