Cleaning and Maintenance
General Notes (2)
Servicing by trained personnel (2)
Safety (2)
Fault correction (2)
Ordering spare parts (3)
service faultNotes for cleaning (3)
Print head (4)
Cleaning the print head (4)
Changing the print head (5)
Checking the print head (6)
Rollers (8)
Rubber rollers (8)
Deflection rollers (9)
Backing paper deflection roller (DPM) (9)
Material deflection rollers (ALX924) (9)
Photoelectric switches (10)
Cleaning the gap photoelectric switch (10)
Cleaning the material end photoelectric
switch (11)
Index (12)
General Notes
Servicing by trained personnel
Regular and proper servicing is necessary in order to ensure that the device is permanently ready for operation.
Qualification Servicing and repair work may only be carried out by appropriately qualified
personnel. The safety, reliability and long service life of the device depend on such work being carried out correctly.
Damage which is caused by improper servicing, repairs or care is the respon-sibility of the person causing it.Manufacturer ser-
vice For reliable servicing, maintenance, diagnosis and fault correction please contact your supplier, the nearest customer service centre or any other ser-
vice centres authorised by the manufacturer.
Safety
Fault correction
Status In the event of faults occurring on the device, evaluate the status reports of
the device before doing anything. Read the corresponding chapter in this do-cumentation.
Call servicing
If you are not authorised to carry out diagnosis and fault correction work, call your technician or the authorised service. The appropriate documentation and spare parts are available to the service personnel in order to carry out repair work of a sufficient quality.Dangerous situations can arise during servicing and repair work. Accidents can be caused by mechanical or electrical influences if the appropriate safety instructions are not heeded!
–Switch off the device during servicing, repair and care work!
–Before opening the housing disconnect the device from the main power supply!
–Before putting the device back into operation, restore it to a safe conditi-on (replace all covers etc.)!
Ordering spare parts
Only use original spare parts from the manufacturer. The use of parts which do not satisfy the high demands set by the printer manufacturer can cause unnecessary problems.The following information is necessary when ordering:Order information –
Type  of  device –
Serial number of the device –
Optional fittings for the device –
Designation and part number of the spare part –Number of parts required
Notes for cleaning
Intervals Regular servicing and cleaning work is necessary for safe operation and high
running performance. The servicing intervals are dependent on the operation and ambient conditions, daily operating times and the print medium.
Regularly clean especially the print head and feed roller of paper, adhesive and ink residues.Cleaning agents
Do not use any cleaning agents which could damage or destroy the coating surfaces, labelling, display, type plates, electrical components etc.
Under no circumstances should you use scouring or synthetic solvent cle-aning agents. Avoid acidic and alkaline solutions.Part to be cleaned
Cleaning agent Print head Cleaning fuel
Rubber rollers (e.g. print roller, feed roller, brake roller)Cleaning agent for rubber rollers (part no. 98925)
Deflection axles or tubes made of
metal
Cleaning fuel, adhesive removal sol-vent Outer surfaces
Commercially available neutral cle-aning agents
Tab. 1:Recommended cleaning agents
Print head
Cleaning the print head
1.Switch off the device.
2.Pull out the mains plug.
3.Remove material and ribbon.
4.Unscrew the two black thumb screws on the print head mounting until the
entire print head mounting can be removed from the contact shaft.
The print head is a sensitive electronic component and can be damaged by electrostatic charges. Therefore, discharge any bodily static electricity before
coming into contact with the print head by touching the base plate of the prin-
ter.
The print head does not need to be unplugged. Mark the position of an axially
adjusted print head.
5.Clean the print head using a dust-free cloth and cleaning fuel.
Abb. 1:Cleaning the print head - the
print head does not need to be
unplugged (as illustrated).
Do not use any objects with sharp edges. Metal objects may never be allo-wed to come into contact with the print head surface!
6.After cleaning, return the print head mounting to its old position and retigh-
ten the thumb screws.
Basic factory settings: Flush against the inner black plastic plug.
Press the thumb screw on the tapered edge of the square axle and ensure the exact positioning of the print head mounting on the axle. Also pay atten-
tion to the position of the print head in relation to the edge of the label.
7.Before switching on the device, check whether the print head cable is still
properly connected. If this is not the case, plug in the cable correctly.
Changing the print head
The print head is adjusted to the print head mounting during manufacture. As a result the print head
can only be replaced in conjunction with the print head mounting.
1.Switch off the device.
2.Pull out the mains plug.
3.Remove material and ribbon.
4.Pull out both plugs in a horizontal direction from the print head.
Wait at least 3 minutes after switching off the device before removing the print
head cable from the print head. Mark the position of an axially adjusted print head.
5.Unscrew the two black thumb screws on the print head mounting until the
entire print head mounting can be removed from the contact shaft (Fig. 1).
Fig. 1:Left side: Unplug connection cables (2pieces) off the print head; right side: loosen the
thumb screws and remove the print head mounting; don´t touch the plug-in contacts (2)
or the print bar (1).
The print head is a sensitive electronic component and can be damaged by
electrostatic charges. Therefore, discharge any bodily static electricity before coming into contact with the print head by touching the base plate of the prin-ter. The print head may not be touched on the print bar (1) or on the plug-in contacts (2).
6.To install, move the new print head mounting to the old position and tighten
the thumb screws.
Basic factory settings: Flush against the inner black plastic plug.
Before doing this make a note of the resistance value of the print head (read off from the print head). When placing the print head on the print head moun-ting, ensure that the print head is lying flat.
Press the thumb screw on the tapered edge of the square axle and ensure the exact positioning of the print head mounting on the axle. Also pay atten-tion to the position of the print head in relation to the edge of the label.
7.Plug the print head cable back into the print head.
8.The resistance value of every new print head must be entered after putting
the printer into operation. Use the parameter "SYSTEM PARAMETERS/Head resistance".
Entering a false value can damage the print head!
For additional information refer to the service manual, topic section …Service Print Module“, paragraph …Exchanging the printhead“.
Checking the print head
The DPM / ALX 924 is provided with a test function, which tests the functio-nality of every single dot (dot check).
There are two different modes of operation with three different possibilities to start a dot check:
Display message Die Displayanzeige für einen defekten Dot ist bei allen Dottestvarianten:
If all dots are faultless, no display message appears.
Duration All five ways of dot checking test the entire printhead width. Therefore, the
test procedure may take from 10s up to several minutes time (the wider the printhead is and the more dots are defective, the longer).
Never change the setting of a dot check parameter, during a dot check is run-
ning!Disregard may cause the printer firmware o crash.Dot check modes Call by Automatic dot check Automatic execution after powering on or in printing
pauses. To activate the automatic, refer to parame-
ter …SYSTEM PARAMETERS/ Autom. dot check“ Easy Plug: Add an optional D to the obligatory #ER
command (-> #ERD) to trigger a dot check at the
end of the print job.
Dot check on demand Dot check with subsequent status report that in-
forms about the number and the location of the de-
fective dots. Parameter .SERVICE FUNCTIONS/
Head dot test.
Dot check with subsequent printing of a pattern
which visualizes the test result. Parameter " PRINT
INFO/ Dottest endless/punched".
In Off-line mode by pressing the Apply+Feed but-
tons. Equals the call by parameter …Head dot test“,
but without the status report. Defective dots are dis-
played by status messages.
Table 2: The five ways to start a dot check.
Status:                    5103
Dot defective

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