Panasonic KX-B620 - Page 17

10.
TROUBLESHOOTING
GUIDE
10-1.
FAULTY
FUNCTION
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
@
Check
from
the
first
symptom
in
alphabetical
order.
®
Power
indicator
LED
off
Check
+5V
power
source
first.
It
will
indicate
whether
the
trouble
is
in
the
MAIN
unit
or
another
area.
®
Key
input
is
rejected.
In
this
case
also,
check
+5V
power
source
first.
Next
the
control
and
Bueration:
boards
must
be
checked.
©
Paper
out
LED
doesn’t
work.
If
power
indicator
is
on
and
then
paper
is
out,
this
LED
must
be
on.
lf
not,
the
control
board
must
be
checked.
One
of
check
points
is
the
power
source
for
1C106.
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.
©
Paper
feed
problem
Same
as
©
except
motor
driver
1C105.
®
Fluorescent
lamp
problem
Input
signals
LAMPON,
LAMPPRE
of
{C106
and
+5V
power
source
must
be
checked.
If
it's
OK,
LAMP
DRIVE
CIRCUIT
is
perhaps
damaged.
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.
Next
check
the
screen
home
position
sensor
board.
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.