Avery Dennison ALX 720, Service Manual

Page: 32 / 51

Service manual
ALX 720
Release 11/2003 Page 32
Step What is wrong What could be the
reason How to check it Action to solve
problem
2a No display or no
meaningful text
No program Check EPROM
correct inserted
•
If the EPROM
was inserted in a
wrong direction
the IC is
defective
•
Sometimes on of
the pins of the
EPROM is bend
and has no or
only sometimes
contact
2b Loosen or defective
display cable
Prove connection
cable Insert plug and
check that it is
locked
Change cable if
damaged
2c Defective display Check with an
another display and
cable
Change display if
the other ones is
working
2d Nothing found Change CPU board
2e Some keys doesn’t
work
Jumper setting not
correct Check jumper on
display board Place jumper in
correct position
3a Error message
“___0”, “___1” or
“___2”
Program fault Error appears
immediately after
power on or can be
reproduced (e.g.
every time starting
labelling)
Change EPROM
3b Error appears
random
See EMI rules and
check cabling
4a Error message
“E_6”
Short circuit or
overload on output Remove D-Sub
connector If message
disappears check
external connection
The maximum
output current in
total is < 3A
4b Internal short circuit Remove plugs
CN33/34 from
connector
If message
disappears, check
internal connection
maybe short circuit
in connector or
wrong connection