Panasonic KX-B620 User manual

ORDER NO. SN)
H19
Service
Manual
aboard
Electronic ag Board
KX-B620
KX-B620A
KX-B620C
KX-B620G
KX-B620H
KX-B620T
KX-B620U
KX-B520
KX-B520A
KX-B520C
KX-B520G
KX-B520H
KX-B520S
ay
—
KX-B520T
(This
picture
is
KX-B620.
Stand
is
optional.)
KX-B520U
}
w
ca
tit
an
as
iis
tsushita
Ele
-
c
Co.,
Ltd.
anaSsonic
rved.
Una
ine
zed
copying
:
iar
fe
ade
nis
a
violat
ola
3?

A. WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public. It
does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
Please use this manual for KX-B620 Series (all
models) and KX-B520 Series with “a” mark on
the nameplate (see below):
NAMEPLATE
Panasonic
ELECTRONIC PRINT BOARD
MODEL NO. KX-B520
POWER SOURCE :
Matsushita Electric industrial Co., Ltd. a |
Made in Japan
Panasonic
ELECTRONIC PRINT BOARD
| MODEL NO. KX-B620
POWER SOURCE :
Matsushita Electric Industrial Co., Ltd.
Made in Japan

CONTENTS
‘ Page
1.
SAFETY
PRECAUTIONS
cccssrsssssssssssssssesssssenessseenneennesnneesanenensennaaes
9
>
INSULATION
RESISTANCE
TEST==-sss-**
sceaina
gate
Cabra
aeiacnee
3.
FOR
SERVICE
TECHNICIANS
crccsesssesssesrssessstssesesssseanennsesessenssesaas
9
A.
SPECIFICATIONS
ssssessesssessesseessessnssteseeserseseenennenes
ee
ener
3
5.
EXTERNAL
DIMENSIONS
cicrresseesssssssssssssseesessessreesenseesesnneanecnnensaes
4
6.
EXTERNAL
PARTS
(With
optional
stand)
seas
SERN
CSW
ads
CR
eeE
Re
Ne
SNEntseneeT
sees,
4
JF.
COMPONENT
LOCATION
ssssissseesssecsesstsssssessssssessseaneesecnsneenaseaneney
5
8.
OPERATOR
CONTROLS/INDICATORS
sevcerssssrssessssessstsseesesentee
tees
5
9.
UNPACKING,
INSTALLATION
srsrressessssssrssssessessetssesnessenensceness
6-14
10,
TROUBLESHOOTING
GUIDE
crresrsessesssesssesssseesesneeseenaneesteny
15-20
41.
DISASSEMBLY
AND
EXCHANGE
crvsssssvssssssessesesseseesnsensereseens
21-24
12,
ADJUSTMENTS
sssessssssssessssssssssenessssseesissssenssassessesesnesnsseneeny
25—30
13.
CIRCUIT
OPERATIONS
eee
e
nee
ec
een
ences
ceresnceneneeene
sane
eeeceneeeceneres
31—60
1.
GENERAL
BLOCK
DIAGRAM
AND
FLOWCHART
virrrvresssssestereseessreetesceses
31-34
ne
CONTROL
SECTION
oinentisn
ticninivintednariyme
bane
tai
36-58
9.
POWER
SUPPLY
UNIT
sresssessssccceseeccceseseectnsescesnasoegecnnnnocesesaautatessorseoncg
59-60
14.
SCHEMATIC
DIAGRAM
crrrsssresssessssssesssssssssessneeseenesesnneenennee
61-62
15.
CIRCUIT
BOARD
ober
ecccccnecncerccvsenecesecccunseusaceceeee
snes
ee
ceed
63
16.
MECHANICAL
PARTS
LOCATION
«erssrssssssssssesssessssessenencanennnennaen
64
17.
REPLACEMENT
PARTS
LIST
cscesssssessesessesessessteeeterseesesssensens
65—69
KX-B620 Series
KX-B520 Series

KX-B620 Series
KX-B520 Series
1.
SAFETY
PRECAUTIONS
1)
Before
servicing,
unplug
the
power
cord
to
prevent
an
electric
shock.
2)
When
replacing
parts,
use
only
manufacturer’s
recommended
components
for
safety.
3)
Check
the
condition
of
the
power
cord.
Replace
it if
wear
or
damage
is
evident.
4)
After
servicing,
be
sure
to
restore
the
lead
dress,
insulation
barriers,
insulation
papers,
shields,
etc.
5)
Before
returning
the
serviced
equipment
to
the
customer,
make
the
following
insulation
resistance
test
to
prevent
a
shock
hazard.
2.
INSULATION
RESISTANCE
TEST
1)
Unplug
the
power
cord
and
check
for
continuity
between
earth
ground
on
the
plug
and
the
metal”
cabinet
part.
2)
With
the
unit
unplugged,
short
the
two
prongs
of
the
plug
with
a
jumper
wire.
3) Turn on the power switch.
4)
Measure
the
resistance
value
with
an
ohmmeter
between
the
jumpered
AC
plug
and
each
exposed
metal
cabinet
part,
such
as
screwheads,
etc.
Note:
Some
exposed
parts
may
be
isolated
from
the
chassis
by
design.
These
will
read
infinity.
5)
If
the
measurement
is
outside
the
specified
limits(approx.
1MQ),
there
is
a
possibility
of
a
shock
hazard.
Exposed
metal
part
Ohmmeter
Resistance= Approx. 1MQ
3.
FOR
SERVICE
TECHNICIANS
ICs
and
LS!s
are
vulnerable
to
static
electricity.
When
repairing,
the
following
precautions
will
help
to
prevent
recurring
malfunctions.
1)
Cover
the
plastic
parts
with
aluminum
foil.
2) Ground the soldering irons.
3)
Use
a
conductive
mat
on
the
work-table.
4)
Do
not
grasp
IC
or
LS!
pins
with
bare
fingers.

KX-B620 Series
KX-B520 Series
4.
SPECIFICATIONS
1.
Typo
ctrreessesrsereseseencerctenresneseesesens
Wall
mounted
(Floor
mounted)
2.
Copy
System
cvvcrrrrssterserteessereeseee
Thermal
Head,
Heat
Sensitive
3,
Copy
Papor
srsrrrtsrscesersterteceeserrs
Heat
Sensitive,
Roll
Paper
4.
Copy
Paper
Size
crrstsrssertrrrsereee
297X210
mm
(Ad
size),
279.4
215.9
mm
(Letter
size)
5.
Copy
Size.
-esrtssrteteressnterteencer
senses
270X170
mm
6.
Copy
Density
eee
arc
ccsencccsenenosecoseens
Approximately
8
dots/mm
7.
Cony
Color
ss
strerseea
tts
cee
shtenesonsey
Black
B,
Copy
Time
--essrrstnescrereecessenesss
Approximately
18
seconds
9.
Paper
Feed
Perr
rrr
er
rrerre
rere
rrr
rr
rrr
Automatic
Discharge
10.
Board
Screen
Size
cvrttststtsrrseet
KX-B620
Series:
912
1,762
mm
[35.9
x
69.4
in]
KX-B520
Series:
912
1,400
mm
[35.9
X565.1
in]
11
Copy
Area’
sneetnetetses
tenes
tensentcr
cont
KX-B620
Series:
842
1,660
mm
[33.1
X65.4
in]
KX-B520
Series:
842
1,330
mm
[33.1
X52.4
in]
12.
No.
of
Screens
crctrrrtttttrrtt
2
Screens,
Endless
Roll
13.
Screen
Scroll
cccrecerccserrrsts
settee
Single
Direction,
Single-screen
Forward
14,
Reading
System
crvrrrrttsrttsrrttseess
CCD
Sensor,
Flat
Scan
15.
External
Dimensions
sirrtttttte*
KX-B620
Series:
1,912(W)
X
165(D)
X
1,232(H)
mm[75.3
X6.5
X
48.5
in]
KX-B520
Series:
1,550(W)
x
165(D)
x
1,232(H)
mm
[61.0
X6.5
X
48.5
in]
1G.
Wealght
s*rnsrteectsteseres
tr
ercste
teense
es
KX-B620
Series:
27kg
[60
Ib]
(without
optional
stand)
KX-B520
Series:
25.5kg
[56.2
Ib]
(without
optional
stand)
17.
Model
No.
cccrsesretsscescressssesseetee
KX-B620,/620A
/620C
/620G
/620H
/620T
/620U
KX-B520,/520A,/520C
/520G
/520H
“5208
/520T
/520U
[a]
KX—B520T
KX—B520/C
KX~B520G/H/S
|
KX—B520U/A
Por
Suen,
mn
ees
(During
operation
at
Normal
Load)
20.
Environmental
Conditions::**:+"****
Temperature
10°C
to
35°C
Humidity
30
to
8596RH
21.
Accessories:
trrrserstrsssrrrerseseesees
Copy
Paper
1
roll
Eraser
1
pe.
Markers
1
Black
1
Red
1
Blue
22.
Assembly
Parts
crosses
Wall-mounting
Fixture
1
for
Fixing
1
for
Adjustment
Frame
Cover
B
1
Frame
Cover
C
1
Bracket
Frame
Fixture
(u)
1
Screw
(M3)
2
for
Frame
Cover
C
Screw
(M4
Short)
5
for
Bracket
Fixture
mae
a
ae
2
for
attachment
of
Printer
Section
%
Screw
(M6)
4
for
Wall-mounting
fixtures
%
This
screws
are
not
provided
with
U.S.A.
model.
Features
@
Any
information
written
on
the
film
screen
can
be
copied
on
A4
or
letter
size
paper.
m
Efficiency
will
greatly
increase
during
conferences,
with
little
need
to
take
notes.
m
Charts,
graphs
or
other
materials
can
be
copied
on
Aé4
or
letter
size
paper.
m@
The
copies
have
a
binding
margin,
convenient
for
filing.
Design
and
Specifications
are
subject
to
change
without
prior
notice.

KX-B620 Series
KX-B520 Series
5. EXTERNAL DIMENSIONS
KX~B620 Series! KX—B520 Series
Length A 1,912
Length B 1,762
6. EXTERNAL PARTS (With optional stand)
Frame Cover Film Screen
Control Panel
Paper Cut Lever
Printer Door
Open Button
(Stand)
Printer
Slot
{$< Caster Lock Lever
Power
Switch
Caster
Power Cord

KX-B620 Series
KX-B520 Series
7.
COMPONENT
LOCATION
KX-B520
Series”
KX-B620 Series
Mirror
Screen Feed Motor Power Supply Unit
& Lamp Driver
Printer Control Board
Power Supply Unit
& Lamp Driver
Printer Control Board
Fluorescent
Lamp
Control
Panel
Fluorescent
Lamp
Control
Panel
8.
OPERATOR
CONTROLS//
INDICATORS
KX-B620
Series
KX-B520
Series
ADVANCE Key
Press to advance the
screen to the left and
expose the Second
Screen without
producing a copy.
POWER Indicator
It indicates +5 Volts
Supply to PCB.
ie | | Oo
POWER Switch
POWER Indicator
It indicates +5 Volts
Supply to PCB.
ADVANCE Key
Press to advance the
screen to the left and
expose the Second
Screen without
producing 4 copy.
ADVANCE
<
POWER Switch
COPY Key
PAPER
OUT
Indicator
COPY
Key
PAPER
OUT
Indicator
;
It
indicates
when
to
add
Press
to
start
copying.
It
indicates
when
to
add
Press
to
start
copying.
paper
and
when
to
close
paper
and
when
to
close
the
printer.
the
printer.

KX-B620 Series
KX-B520 Series
9.
UNPACKING
/
INSTALLATION
Installation Requirements
The
Panaboard
is
a
precision
designed
machine,
which
somewhat
depends
on
the
surrounding
conditions
for
optimum
operation.
Attention
to
the
following,
will
result
in
more
reliability
and
quality
performance.
1.
The
Panaboard
should
not
be
installed
in
areas
with
the
following
conditions:
(1)
High
temperature
and
high
humidity
or
low
temperature
and
low
humidity
(2)
Direct
exposure
to
sunlight
(3)
Direct
in
air
conditioning
flow,
or
close
to
heater
ducts
(4)
Uneven
floor
2.
The
Panaboard
weights
35
kg
(KX-B520
Series:
32
kg),
it
should
be
installed
on
sturdy
flat
surface.
UNPACKING
KX-B620 Series
Carton
Bracket Frame—-c—
Fixture (u) iL
Cushion
(upper
left)
Brackets
and Screws
Cushion (upper right)
Cushion |
(lower left)
Cushion(lower right)
SE)- ‘Speed Clips

KX-B520 Series
Carton
Cushion(upper
center)
5
Frame Cover Box
KX-B620 Series
KX-B520 Series
Manuals
oe
Cs Marker Set
Bracket Frame
Fixture (u)
Cushion
(upper
left)
Frame Cover
Brackets
and Screws
Cushion for the unit(2)
Screws
ae
a
Cushion
(lower left)
Speed Clips(6)———_"
Bottom Carton

KX-B620 Series
KX-B520 Series
INSTALLATION
The
packing
box
includes
the
parts
noted
below;
please
confirm
that
all
parts
are
present
before
beginning
work.
.
@
Accessories
for
Assembling
the
Electronic
Print
Board:
~ Order of Use (Step) Illustration Q'ty Order of Use (Step)
€)mm ~
@ (E)
[M4x20 mm (13/e" )]
® ®
Mounting holes [Frame Cover C]
Illustration /Q’ty
Sacer ge
(Bracket Frame Fixture(u)]
[M412 mm (15/32" )]
.
{Frame Cover B] x1 [M3x8 mm (8/16 )]
Installation,“ Assembly
Note: @ Assemble Print Board on a flat surface.
@ Failure to remove the joint Bracket (with Red Tag) before opening Print Board could result in
Hinge damage.
Assembling of the Print Board is as follows:
Wall/Floor mounted Type
Wall mounted Type Installation jo
Floor mounted Type Installation
(One Person Installation)
Applicable Steps
2|0/@|6|6 2\e/0|0/9/0|0/9/9/6\0)
Teeter! | | leelelel
peteelee| | lleiteleister

KX-B620 Series
KX-B520 Series
@
Preparation-1
(Wall
mounted
Type)
Ensure
there
is
a
Power
Receptacle
with
in
the
mounting
position
of
Electronic
Print
Board.
First
confirm
that
the
wall
strength
is
fully
sufficient
to
support
the
electronic
print
board.
CAUTION:
The
wall
must
be
capable
of
supporting
at
least
87
kg
(about
192
Ib)
for
KX-B620
The
wall
must
be
capable
of
supporting
at
least
82
kg
(about
181
Ib)
for
KX-B520
Wall
fixture
mounting
screws
Wall-mounting
fixtures
[M6X20
mm
(2/47
9]
@
The
wall
mounting
fixtures
can
be
mounted
at
one
of
three
intervals:
75
cm
(2'5'7/49"),
100
cm
(3’
33”),
122
cm
(4
42").
@
Be
sure
the
two
wall
fixtures
are
level
with
each
other.
@
Please
use
the
proper
type
screw
to
secure
the
wall
fixtures
for
the
various
wall
materials.
Only
U.S.A.
The
four
screws
(installation
above)
used
to
secure
the
wall-mounting
fixtures
are
not
provided.
Proper
mounting
screw
(E.G.
MOLLY
BOLTS)
should
obtained
to
properly
secure
the
Wall-mounting
fixtures.
?
"
|
an
eee
KX-B520//B620
ait
__2
— 4 joint Bracket
' SR
Get rid of the Fold up Roller
See the item
“Assembly of the stand (KX-B06C/06CS)
for the electronic print board (KX-B520)".
©mom*
[M6X 20 mm (2/27 )]
@ Accessories for Wall-mounting:
: Mounting Screws
[Wall-mounting
[Wall-mounting
are
not
provided
with
Fixture:
for
Adjustment]
|
Fixture:
for
Fixing]
U.S.A.
model.

KX-+B620 Series
KX-B520 Series
SEH
LEC
M4X12 mm (182 )
M4x12 mm (%8A2" )
Install the wall mounting screws at the desired interval.
122 cm
(4 Yor)
100 cm
(3'3%”) ‘
75 cm Wall mounting screw hole
(2'5 a")
Rear surface of electronic print board
Wall mounting screWs
@ The mounting screws may be installed at one of three intervals: 75 cm (2’5'742”), 100 cm (3’ 334"),
122 cm (4’ 142”). Be sure to install the screws at the same mounting interval selected in part@.
@ The wall mounting screws have been factory installed at the 100 cm (3’ 334”) position.
® Tighten the mounting screws securely. Even if the factory-installed mounting interval is selected, be
sure to retighten the screws before use.

KX-B620 Series
KX-B520 Series
@
Mount
the
electronic
print
board
on
the
wall
mounting
fixtures.
Write
the
positions
of
two
wall
mounting
screws
on
the
upper
frame
cover
using
the
Panasonic
approved
marker,
and
use
them
as
mark
of
mounting
the
print
board.
After
mounting,
erase
the
mark
of
the
positions.
The
relationship
between
the
mounting
screws
and
the
wall
mounting
fixture
is
shown
below.
Groove in
mounting fixture
Print board
Wall mounting
axel
rea
sere
Wall mounting
fixture
Cushion
@
When
mounting
the
electronic
print
board,
avoid
banging
it
against
the
wall
or
otherwise
causing
impacts.
Impacts
may
cause
damage
to
the
internal
fluorescent
lamp
or
other
parts.
@
Set
so
that
the
cushion
on
the
rear
side
of
the
board
contacts
the
wall
in
a
flat
position.
WINOTE:
After
mounting
the
electronic
print
board,
check
the
following
points:
®
Pull
the
electronic
print
board
forward
slightly
and
confirm
that
the
mounting
screws
are
hooked
firmly
inside
the
mounting
fixtures.
@
Place
weight
gently
on
the
electronic
print
board
and
confirm
that
the
wall
is
strong
enough
to
support
the
electronic
print
board.
*To
allow
the
electronic
print
board
to
be
used
in
a
stand
setting,
use
of
the
optional
stand
Remove
the
two
screws,
then
use
them
for
safe
keeping
in
step
@.
K X-B620,/B520

KX-B620 Series
KX-B520 Series
Frame cover guide
Align the upper frame cover with right and
left frame cover guides, and raise up.
¥
52 crn [(20.5”) for KX-B620] 52cm [(20.5") for KX-B620]
43 cm [(17") for KX-B520] 43 cm [(17") for KX-B520]
Place your hands at points about 52
cm [(20.5” ) for KX-B620] or 43 cm
[(17” ) for KX-B520] from the right .
and left ends, and raise the upper
cover, pressing’:in the direction of
the arrows until the cover clicks into
place.

Lift
up
.the
printer
section
and
press
into
the
board
until
it
clicks
into
place.
m
To
disassemble
the
electronic
print
board:
Reverse
the
previous
steps
(from
step
12
to
step
1).
@
To
disconnect
the
connector
from
the
electronic
print
board,
grasp
the
lock
of
the
connector
as
shown
at
the
right,
then
pull
out.
@
To
disconnect
the
printer
section
from
the
electronic
print
board,
press
two
springs
simultaneously
on
the
right
and
left
mounting
fixtures
for
the
printer
section
as
shown
at
the
right
while
lifting
up
the
printer
section.
@
After
assembly,
moisten
a
clean
soft
cloth
with
water,
wring
well,
and
wipe
the
film
surface
gently.
KX-B620 Series
KX-B520
Series

KX-B620 Series
KX-B520 Series
Tighten printer section to
(M4x20 mm @°/4” )] ;
frame with 4 screws.
Align the lower cover with the right and left frame cover guides,
and press down.
Place your hands at points about 52 cm [(20.5”) for KX-B620] or 33
em [(13”) for KX-B520] from the right and left ends, and push
down on the lower frame cover, pressing in the direction of the
arrows until the cover clicks into place, then fasten with screws.
@ Always fix in place with the screws to assure safety.
B2em (29,
5°
33 cm [013° ) f
[M3x8 mm @/6")]

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.

KX-B620 Series
KX-B520 Series
©
Paper out LED. doesn’t work.
Check the |
->Check the —Replace
input pin 30. = micro _the micro
of CPU. switch switch.
'. (10102) installed
It is. “H” condition.
when paper
is out.
Check the Replace
ENDLED 10102.
signal pin 3
of 1C106.
Isit “L”?
Check the —Replace
output pin4d IC 106.
of [C106 .
Is it “L”?
Check the operation panel and cable.
Screen feed problem
Check the reassemble
mechanical
condition:
Check the —Replace
input pins 1, 10102.
5, 8, 12 of
10104.
Check the —Replace it.
+24V cable.
Check the —Check — Replace
+24V power ZD100, them.
source pins 3, -ZD101.
10 of 1C104.
Check the —Replace
output pins 10104.
2, 4, 9, 11 of
10104.
Replace the motor.
© Paper feed problem
Check the
mechanical
condition.
— reassemble
Check the
~> Replace
input pins 1, {$C102.
5,8,12 of
1C105.
Check the —Check — Replace
+24V power ZD102, them.
source pins ZD103.
3, 10 of 1C105.
Check the
output pins
2,4,9,11 of
1C105.
— Replace
1C105.
~ Replace the motor.
© Fluorescent lamp problem
Check the Replace
input pins 5,, 410102.
9 of 1C106.
Check the —Check the
+24V power MAIN
source. unit.
Check the Replace
output pins 1C106.
6, 8 of IC106.
Check the LAMP DRIVE CIRCUIT.
Replace the LAMP.

Screen
sensor
problem
Check
the
=Adjustthe
—
Replace
mechanical
tension
of
the
condition.
the
screen.
screen.
Check
the
-—
Replace
screen
sensor
home
1C400.
position
sensor.
Check
the
-»Replace
input pin 27 1102.
of 1C102, at
home
position.
It must be
below +2V.
10-2.
FAULTY
COPY
SYMPTOM
r— No printing
All black
Dark printing
Faint printing
Density difference
between right and left
White line
White band
Black line
Black band
CG008 98088
First
check
the
mechanical
condition.
Next
the
thermal
head
signals
and
power
sources
must
be
checked,
it
will
indicate
whether
the
thermal
head
is
faulty
or
not.
if
all
the
above
checks
are
good,
the
thermal
head
is
faulty.
If
not,
check
the
CCD
board
and
control
board.
®
No printing
The
thermal
head
signals
must
be
checked.
If
they
are
proper,
the
thermal
head
is
faulty.
All black
"It
is
very
rare
that
the
thermal
head
is
faulty.
Perhaps
the
CCD
board
or
the
control
board is bad.
—17—
KX-B620 Series
| KX-B520 Series
Dark printing
Check the following.
® Faulty optical axis
@ Lack of light of the fluorescent lamp
@ Faulty CCD board
@ Faulty control board
@ Faulty mechanical condition of the
screen
@ |f achart is attached, attach it again
properly.
Faint Printing
Check the following.
®
Poor
contact
between
the
thermal!
head
and
the
platen
@ Dirty surface on blank area of the
screen
@ Dirty surface of the mirror
@ Dirty surface of the lens
@ Dirty surface of the CCD
® Dirty surface of the thermal head
@ Faulty optical adjustment
® Faulty CCD board
@ Faulty contro! board
Density
difference
between
right
and
left
@ Poor contact between the thermal head
and the platen
@ Faulty optical adjustment
White line
@ Faulty thermal head
@ Dirty surface of the mirror
@ Dirty surface of the lens
@ Dirty surface of the CCD
@ Dirty surface on blank area of the
screen
White band
@ Strobe pulses must be checked first.
@ Faulty thermal head
Black line
@ Dirty surface of the mirror
@ Faulty optical adjustment
Black band
® Faulty optical adjustment
@ Faulty thermal head

KX-B620 Series
KX-B520 Series
®
No printing
I Check ‘the analog circuit in the control
Dark printing
Faint printing
—Check
the
Close
the
Check
the
—
Adjust.
mechanical
printer
optical axis
condition
of
correctly.
adjustment.
the
printer.
:
Check
the
~>Replace.
—~-
Check
the
screen
;
+24V
—
Check
the
tension.
CN17
pin
cable.
1-4.
Check
the
—>
Replace.
fluorescent
—
Check
the
—Check
the
—Replace
lamp.
video signal!
+12V
1C201.
TP2
in
the
power
Check
the
CCD
board.
CCD
board.
source
and
clock
Check
the
control
board.
.
Signals to
CCD
1C201.
board
(1C109
pin
15).
Check
the
—
Close
the
printer
printer
Check
the
Check
—Replace.
mechanical
correctly.
HDATA
10103,
condition.
LATCH
10109.
CLKHD
Check
the
—
Clean
this
signals
in
white
blank
area
area.
the
control
of
the
screen.
board.
Check
the
~>
Clean.
Faulty
—
Replace
it.
surface
of
the
thermal
head
lens.
Check
the
—
Clean.
®
All
black.
surface
of
the
CCD.
Check
the
—Check
the
—Replace
video
signal
clock
1C201.
Check
the
—
Clean.
TP2
in
the
signals
to
surface
of
the
CCD
board.
CCD
!C201.
thermal
head.
Check
the
—
Adjust
it
Check
the
analog
signal
IC
109
pin
15
in
optical
axis.
correctly.
the
control
board.
Check
the
~>
Replace.
video
signal
in
Check
the
Check
—
Replace.
the
CCD
board.
HDATA
1C103,
LATCH
1C109.
Check
the
control
board.
CLKHD
signals
in
Density
difference
between
right.and
left
the control
board.
Check
the
->
Close
the
printer
printer
Faulty
—>
Replace
it.
mechanical
correctly.
thermal
head
condition.
Check
the
—
Adjust
it
optical
axis.
correctly.
—18—