Epson Mt532 Manual

							4-2   MaintenanceRev. A
Confidential
Removing Stains (Except for the Thermal Head)
The areas where the paper is fed will be stained or collect dust after printing for a long time 
because of paper dust and heat sensitive materials contained in the paper. Especially, if paper 
feed rollers, the platen, or the paper detectors are not clean, a malfuncion of paper feeding or 
paper detection may occur. In this case, wipe off stains with alcohol.
CAUTION:
Never use thinner, benzine, trichloroethylene, or ketone group solvents, since they could 
damage rubber and plastic parts or cause them to deteriorate.
Removing Dirt and Dust
Use an electronic vacuum cleaner to remove dirt and dust. After cleaning, check the lubrication 
point and lubricate when necessary.
Note:
When opening the units and cleaning them, be sure not to damage parts and paper detectors, disconnect 
wires, or unplug connectors.
Removing Foreign Matter When the Cutter Locks
Follow the procedures below to remove foreign matter when the cutter of the printer module 
locks.
After rotating the motor
 in reverse so that the movable cutter blade, full, H
 returns to the 
home position, shut off the current to the motor
; then remove any foreign matter. (See Figure 
2-20 on page 14 in Chapter 2 for checking the home position.)
If the movable cutter blade, full, H
 fails to return to the home position even after executing 
the above procedure, follow the steps below.
1. Shut off the current to the motor
.
2. Rotate the knob on the gear, cutter worm, H
 with a tool, such as tweezers, so that the 
movable cutter blade, full, H
 returns to the home position; then remove the foreign 
matter. 
						

							Rev. AMaintenance   4-3 EU-T532/T542 Technical Manual
Confidential
Inspection
The maintenance and inspection procedures for the printer fall into two categories. One is 
“Daily checks” for the printer user, and the other is “Periodic checks” for someone with more 
technical knowledge. Maintenance and inspection procedures should be carried out by properly 
qualified personnel.
Daily Checks
Make sure the printer is used properly and kept in good repair. If there are any problems, 
replace the printer. The check items are as follows:
Periodic Checks
Every six months, check the items listed in the table below. If there are any problems, correct 
them using procedures in the table blow.
Table 4-1 Daily Checks
Check item Standard Procedure
Setup status No cables or connectors are 
disconnected.Connect the cables or connectors 
properly.
Paper roll is loaded properly. Load the paper properly.
No unit of each modules is open.
(the paper roll hold unit, the platen unit, 
the upper frame, cut sheet presenter unit, 
the cover, circuit board B, and etc.)Close the units.
Paper chips or foreign 
matter inside the 
productNo paper chips or foreign matter is inside 
the productRemove paper chips or foreign matter.
Paper state Specified paper is used. Replace with the specified paper
No discolored or torn paper is used. Replace with a new paper roll.
Table 4-2   Periodic Checks
Check item Standard Procedure
Dust, fuzz or dirt sticking 
to various parts· No dirt or dust is attached or collected in 
   the paper path.· Remove dust, fuzz, or dirt with a vaccum 
cleaner.
· No paper chips or foreign matter 
   is in the areas such as around the 
   thermal head heating elements, the
   cutter, gears, detectors, and inside the 
   paper path.· Wipe off dirt and dust with alcohol.
· Remove foreign matter or paper chips.
· Wipe off paper chips on the platen 
surface with alcohol when the surface is 
accumulated with paper chips.
Lubrication status Lubrication is satisfactory. Lubricate the lubrication points if 
required.
Operating status
· Printing, paper feeding and issuing 
operations perform properly.
· No abnormal sound
· All other functions perform properly and
   parts are not deformed or worn.See “Troubleshooting” on page 5-2. 
						

							4-4   MaintenanceRev. A
Confidential
Lubrication
Lubrication is particularly important in keeping the printer operating properly as long as 
possible. Therefore, lubricate at prescribed intervals, using the correct lubricants.
Lubricant
The performance and durability of the printer are greatly affected by the lubricant applied. 
Therefore, pay careful attention to lubricant specifications, especially for the low temperature 
characteristics. The lubricants for the printer are chosen based on technical information analysis 
and tests on various lubricants by EPSON. The lubricants are available in 40 cc (gr.) plastic 
containers (the minimum supply unit). Both G-36 and G-15 are used on this printer.
Lubrication Standards
Lubricate the printer in the following situations:
oLubricant is wiped off during cleaning.
oLubricant is wiped off when disassembly or assembly is performed.
When lubricating parts during assembly of the printer, clean parts before lubricating them.
Refer to the next section and “Lubrication Diagram” at the end of this manual for the lubricants 
and the lubrication points.
Lubrication Point
The lubrication points are as follows:
Table 4-2   Lubrication Point
Module Number Lubrication pointLubrication 
type Amount of lubricant
Printer 
module1 Two points where the screw on the 
lock lever is 
securedG-15 1 mm-diameter 
lubricant
2 to 7 The seven points where the gears on the 
autocutter 
are engaged with other parts.G-36 Appropriate quantity
8 The oval hole on the 
movable cutter blade 
(Two points)G-15 1 mm-diameter 
lubricant
9 The two points where the 
cutter frame contact the 
fixed blade. G-15 1 mm-diameter 
lubricant
10 The two points where the shaft of the 
movable 
cutter blade rotates.G-15 Appropriate quantity
11 The dowels where the platen unit rotates. G-36 Until the dowels are 
covered.
12 The points where the 
frame assembly contact the 
lock lever assembly.G-15 1 mm-diameter 
lubricant 
						

							Rev. AMaintenance   4-5 EU-T532/T542 Technical Manual
Confidential
Note: The lubrication point numbers in the table are the same as those in the lubrication diagrams at the end of this manual.
Lubricant List
Tools
Paper roll 
supply 
module13 Two contact points where the paper roll hold unit 
turnsG-36 Appropriate quantity
14 Contact point where the paper roll tension turns G-36 Appropriate quantity
Cut sheet 
presenter 
module15 Two points where the cut sheet presenter module 
turnsG-36 Appropriate quantity
16 Two points where the upper frame, cut sheet 
presenter unit turnsG-36 Appropriate quantity
Table 4-3 Lubricant List
Type Name Quantity Commercial availability
GreaseG-15 40 gr
Epson exclusive product
Grease G-36 40 gr
Table 4-4 Tool List
Tool name Commercial availability
Brush #1 Yes
Cleaning brush  Yes
Crosshead screwdriver #0, 1 and 2 Yes
ET holder No. 1.5, 2, 2.5, 3, 3.5 and 4
Yes
Tweezers Yes
Diagonal cutting nippers
Yes
Pliers
Yes
Electric solder iron
Yes
Wrist band
Yes
Table 4-5 Measuring Equipment List
Name Standard
Multimeter DC voltage: 400 V max. 
Resistance: measurable
Oscilloscope 500 MHz with storage
Table 4-2   Lubrication Point
Module Number Lubrication pointLubrication 
type Amount of lubricant 
						

							4-6   MaintenanceRev. A
Confidential 
						

							Rev. ARepair   5-1 EU-T532/T542 Technical Manual
Confidential
Chapter 5
Repair
Repairs are divided into two levels (A and B) in consideration of the degree of difficulty of 
repair. The person who repairs the printer should perform the proper repair procedures, 
depending on the individual technical knowledge and skills.
Repair Levels
Repair Procedure
When problems occur, check the condition of the printer and locate the cause of the problem as 
outlined in “Troubleshooting Table.” Then repair the unit properly. The table consists of the 
following five sections.  Level A:Requires general knowledge of the printer’s operation 
principles and structure but does not require specialized 
experience.
Level B:Requires a certain degree of knowledge of the printer’s 
operating principles and structure as well as skills and 
experience using special tools for disassembly and assembly 
of the printer.
PhenomenonFind the type of problem in this column.
ConditionCheck the condition of malfunction by referring to this 
column.
CauseLocate the cause of the problem by referring to this column. 
Also, the repair level is indicated for each cause; use this 
indication to determine the method of repair.
Where/ how to checkThe mechanisms that may cause problems as well as 
checkpoints are listed in this column. Check the unit as 
outlined in this column to locate the malfunctioning section.
ProcedureRepair malfunctioning sections as indicated in this column. If 
the same problem or phenomenon reoccurs after the specified 
repair is performed, check other items in the “Cause” column 
and repair the unit again.  
						

							5-2   RepairRev. A
Confidential
Troubleshooting
Use troubleshooting procedures in the table below when problems occur.
Table 5-1 Troubleshooting
Phenomenon Condition Cause Level Where/how to check Procedure
No 
performancePower (24 V) is 
not suppliedPower connector is 
disconnected.A See if the power 
connector is 
connected properly.Connect the power 
connector again.
POWER LED is not 
lit.Fuse (F1) is blown.B Check with a tester if 
the fuse (F1) on the 
control circuit board is 
conductive.·Replace the blown 
fuse.
·Replace the 
control circuit 
board if there is no 
recovery after the 
fuse replacement.
PAPER OUT LED 
is lit.Paper out error (1) Paper is not 
loaded in the 
printer.A Check if the paper is 
loaded.Load the paper in 
the printer.
(2)Only a small 
amount 
remaining on 
the paper roll 
     (paper NE
     detected)A Check the amount of 
the paper remaining in 
the paper supply 
module.Replace the paper 
roll if only a small 
amount of the 
paper remaining is 
left.
PAPER OUT LED 
is not lit even 
when the 
paper is out.Paper detector 
failure(1)Paper chips or 
foreign matter is 
 jammed around 
the paper 
detector.A
Check whether paper 
chips or foreign matter 
is jammed around the 
paper detector.Remove the paper 
chips or foreign 
matter if there is 
any.
(2)Paper chips or 
foreign matter is 
jammed around 
the paper NE
detector.A
Check whether paper 
chips or foreign matter 
is jammed around the 
paper NE detector.Remove the paper 
chips or foreign 
matter if there is 
any.
PAPER OUT LED 
is lit even when 
the paper is not 
out.Paper detector 
failure(1) Paper NE 
connector is 
disconnected.A
Check if the paper NE 
detector is connected 
properly.Connect the 
connector properly 
if it is disconnected.
(2)Paper NE 
detector is 
damaged.B Check the paper NE 
detector function with 
an oscilloscope.Replace the paper 
NE detector if it is 
damaged.
(3)Paper detector is 
disconnected.A Check if the paper 
detector is connected 
properly.Connect the 
connector properly 
if it is disconnected.
(4)Printer detector 
is damaged.B Check the paper 
detector function with 
an oscilloscope.Replace the paper 
detector if it is 
damaged.
(5)Printer FFC is 
disconnected.A Check if the printer FFC 
is connected properly.Connect the FFC if it 
is disconnected. 
						

							Rev. ARepair   5-3 EU-T532/T542 Technical Manual
Confidential
PAPER OUT LED 
is flashing.Self test standby 
stateSelf test is in the 
standby stateA Check if the self test 
printing is completed.Press paper feeding 
SW on the control 
circuit board to 
complete the self 
test when not 
completed.
ERROR LED is 
flashing.
(For the LED 
flashing 
patterns, see 
“Error LED” on 
page 3-12.)Print head high 
temperature 
errorThe head 
temperature has 
reached at 70°C or 
more.A-
-
(When the head is 
cooled down to 
60°C or less, the unit 
will recover 
automatically.)
ERROR LED is 
flashing
(For the LED 
flashing 
patterns, see 
“Error LED” on 
page 3-12.)Platen open error The platen is open. A
Check if the platen is 
not open.Close the platen 
when it is open.
Platen open is 
not detected.The platen open 
detector is 
damaged.B Check the platen open 
detector function with 
an oscilloscope.Replace the 
detector if it is 
damaged.
Autocutter error (1)Paper chips or 
foreign matter is 
inside the 
autocutter and 
has locked it.B Check whether paper 
chips or foreign matter 
is jammed inside the 
autocutter.After turning off the 
power, remove 
paper chips or 
foreign matter; then 
turn on the power.
(2)The internal 
function of the 
autocutter is 
damaged.B Check the power 
supply voltage.Replace the 
autocutter if the 
power supply 
voltage is normal.
Black mark 
detection error(1)No black mark is 
printed.A Check if the paper is 
printed with a black 
mark.Replace with the 
black mark printed 
paper.
(2)The wrong side 
of the paper is 
used.A Check if the correct 
side of the paper is 
used.Replace with the 
paper with the 
black mark on the 
correct side.
(3)The black mark 
detector is 
damaged.B Check the black mark 
detector function with 
an oscilloscope.Replace the 
detector if it is 
damaged.
(4)Paper chips or 
foreign matter is 
jammed around 
the black mark 
detector.A
Check whether paper 
chips or foreign matter 
is jammed around the 
black mark detector.Remove the paper 
chips or foreign 
matter if there is 
any.
Table 5-1 Troubleshooting
Phenomenon Condition Cause Level Where/how to check Procedure 
						

							5-4   RepairRev. A
Confidential
Printing 
operation does 
not work.Nothing is 
printed.(1) The head FFC 
connection 
failureA Check whether the 
head FFC is connected 
properly.Connect the head 
FFC properly.
(2)The head FFC 
signal line is 
broken.A See or check with an 
oscilloscope whether 
there is damage or 
break of the head FFC.Replace the head 
FFC if it is broken.
(3)Head input pulse
failureB
Check with an 
oscilloscope whether 
the input pulse is within 
the specified range.If the input pulse is 
abnormal, replace 
the control circuit 
module.
(4)Head failure
(Dr.IC, etc.)B
If the input pulse is 
normal, replace the 
thermal head.
Dots are missing 
continuously.(1)Foreign matter is
attached to the 
head heating
elementsA
See if anything is wrong 
with the head heating 
elements Clean the head 
heating elements if 
foreign matter 
attached.
(2)The head
heating
elements are
damaged.A Replace the thermal
(3)Head failure
(Dr.IC, etc.)B
Check with an oscillo-
scope if the input pulse 
is within the specified 
range.If the input pulse is 
normal, replace the 
thermal head.
Dots are missing 
occasionally.(1)Foreign matter
is on the surface 
of the platen.A Check the surface of 
the platen with an 
oscilloscope or a 
magnifier.Clean the surface of 
the platen if foreign 
matter is attached 
to it.
(2)The platen
surface is
deformed.A
Replace the platen 
if there is any 
damage on the 
platen surface.
Table 5-1 Troubleshooting
Phenomenon Condition Cause Level Where/how to check Procedure 
						

							Rev. ARepair   5-5 EU-T532/T542 Technical Manual
Confidential
Printing is faint. All printing color is 
faint.Printing density 
setting is set to light. 
(The color sensitivity 
difference 
depending on the 
paper)B·Check the printing 
  density setting of the
  control circuit module.
·Check if the specified 
  paper is used.Change the setting 
of the printing 
density to darken.
All or some part 
of printing is faint.(1)Dirt or foreign 
matter attaches 
to the head 
heating 
elements.A See or check the head 
heating elements with 
a magnifier.Clean the head 
heating elements if 
foreign matter is 
attached to the 
elements.
(2)Thermal 
sensitivity has 
deteriorated 
due to paper 
deteriorationA Check whether the 
paper has 
deteriorated.Replace the 
deteriorated paper.
(3)Thermal head 
 heating 
elements are 
defective.B Check the surface of 
the thermal head with 
a magnifier.Replace the thermal 
head.
Printing is partly 
faint.Damage or 
deformation of the 
platen surfaceA See or check with a 
magnifier the platen 
surface.Replace the platen 
if the platen surface 
is damaged or 
deformed.
Abnormal or 
incorrect 
printingAbnormal or 
incorrect printing(1)Thermal head 
     input pulse
     failureB
Check with an oscillo-
scope if the input pulse 
is within the specified 
range.If the input pulse is 
abnormal, replace 
the control circuit 
board.
(2)Thermal head 
failure
(Dr.IC, etc.)B
If input pulse is 
normal, replace the 
thermal head.
Paper cannot 
be inserted.Paper cannot be 
inserted into the 
printer module.(1)Paper chips or 
foreign matter is 
in the paper 
guide of the 
printer module.A Check whether paper 
chips or foreign matter 
is inside the paper 
guide.Remove paper 
chips or foreign 
matter if there is 
any.
(2)Paper detector 
on the paper 
guide of the
printer module is
defective.B Check if the detector 
operates properly.·Remove paper 
  chip or foreign 
  matter if there is 
  any.
·Replace the 
detector if it is 
damaged.
(3)The shape of the 
paper edge is 
not like the 
     specified one.A Check if the paper 
edge is cut properly.Cut the paper edge 
properly. 
Table 5-1 Troubleshooting
Phenomenon Condition Cause Level Where/how to check Procedure