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Service manual
ALX 720
Step
What is wrong
4c
4d
4e
Error
message
"E_10"
4f
5a
Error
message
"E__5"
5b
5c
Error
message
"E__9"
6
Error
message
"E__9"
Release 11/2003
What could be the
reason
Defective
output
driver UDN2983
Board failure
Voltage
regulator
defective by over
voltage.
Output voltage too
high.
Label sensor supply
10V not ok
Fault 10V regulator
Motor driver fault
Page 33
How to check it
Replace
output
driver U3 and U4
from socket (Figure
1)
Measure
output
voltage terminal 28
against terminal 14
Measure
input
voltage of board.
Measure
output
voltage terminal 28
against terminal 14.
Disconnect
label
sensor
Measure voltage on
pin 1 against 5
Measure voltage on
pin 1 against 5
Check
connection
cable
Action
to
solve
problem
If
message
disappears, use only
one driver if the
other one is not in
use
Check
external
connection
for
reason
for
short
circuit
Voltage has to be
22V – 26V.
If not ok, replace
board
If
>28V~
see
troubleshooting
transformer.
Voltage has to be
22V – 26V.
If not ok, replace
board.
If
message
disappears
check
sensor and cable
Replace label sensor
If
voltage
<10V
replace board
If
voltage
>15V
replace board
See trouble shooting
motor
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