Sharp XE-A301 Service Manual ▷ View online
STROBE No.
DOT No.
Dots/Strobe
Note
/STROBE4
577
∼
864
288
Excluding dots No.1
∼
88,
377
∼
488 and 777
∼
864
/STROBE3
433
∼
576
144
/STROBE2
289
∼
432
144
/STROBE1
1
∼
288
288
4) Motor block diagram
<JOURNAL MOTOR>
PIN
No.
SIGNAL
NAME
DESCRIPTION
1
VJCOM
COMMON voltage
2
3
/JPFA
JOURNAL-side paper feed motor phase A
driving signal
driving signal
4
/JPFB
JOURNAL-side paper feed motor phase B
driving signal
driving signal
5
/JPFC
JOURNAL-side paper feed motor phase C
driving signal
driving signal
6
/JPFD
JOURNAL-side paper feed motor phase D
driving signal
driving signal
<RECEIPT MOTOR>
PIN
No.
SIGNAL
NAME
DESCRIPTION
1
VRCOM
COMMON voltage
2
3
/RPFA
RECEIPT-side paper feed motor phase A
driving signal
driving signal
4
/RPFB
RECEIPT-side paper feed motor phase B
driving signal
driving signal
5
/RPFC
RECEIPT-side paper feed motor phase C
driving signal
driving signal
6
/RPFD
RECEIPT-side paper feed motor phase D
driving signal
driving signal
The paper feed motors are stepping motors with 4-phase driving
coils. The motors are driven by switching over the driving coils.
coils. The motors are driven by switching over the driving coils.
<MOTOR DRIVE SEQUENCE> ON: Energized/OFF: Not energized
JOURNAL MOTOR
STEP No.
PHASE A
PHASE B
PHASE C
PHASE D
1
ON
OFF
OFF
ON
2
ON
OFF
ON
OFF
3
OFF
ON
ON
OFF
4
OFF
ON
OFF
ON
RECEIPT MOTOR
STEP No.
PHASE A
PHASE B
PHASE C
PHASE D
1
ON
OFF
ON
OFF
2
ON
OFF
OFF
ON
3
OFF
ON
OFF
ON
4
OFF
ON
ON
OFF
5) End sensor block diagram
SIGNAL NAME
DESCRIPTION
+5V
+5V
/RPES
Receipt paper end sensor detecting signal
/JPES
Journal paper end sensor detecting signal
GNDL
GND
The photo diode on the PWB detects the presence/absence of the
paper passing under the journal and receipt platens.
paper passing under the journal and receipt platens.
6) Head up sensor
SIGNAL NAME
DESCRIPTION
PHUPS
Head-up detecting signal
GNDL
GND
The micro switch at the left side of the printer detects the head-up
state.
state.
ON:
Head-down
OFF: Head-up
A
B
C
D
M
/RPFA, /JPFA
/RPFB, /JPFB
/RPFC, /JPFC
/RPFD, /JPFD
VRCOM, VJCOM
VRCOM, VJCOM
stepping motor
+5V
/RPES, /JPES
GND-L
1
2
3
4
39K
Ω
220
Ω
reflex photo sensor
0.1µF
GND-L
PHUPS
micro switch
CHAPTER 3. HANDLING THE
PRINTER
PRINTER
1 Special Handling Considerations
(1) When transporting the printer
•
When transporting the printer, the head up lever should be raised
in the
in the
B
: Head up position so that the head does not contact the
platen rollers.
Failure to do so will may result in pear the printer performance.
Failure to do so will may result in pear the printer performance.
•
When the printer is carried, it should not be held at the connectors,
the lead wires, paper take-up frame, etc.
the lead wires, paper take-up frame, etc.
•
When carrying the printer, never allow large impacts to occur, such
as by dropping, collision, etc.
as by dropping, collision, etc.
•
When carrying the printer, hold the frame with both hands, as
shown in the figure below.
shown in the figure below.
Fig. Carrying the printer unit
•
When transporting the printer, pack it using anti-static packaging.
Do not touch the thermal head and the surface of the PWB. When
handling the printer, properly ground yourself.
handling the printer, properly ground yourself.
Head up lever position
:
Close position
The head is in contact with the platen roller
The printer operates and feeds the paper.
The illustration shows the state when the PT-cover is removed
for explanation purposes only.
for explanation purposes only.
Fig.
Close position
:Head-up position
The head is not in contact with the platen roller.
When the printer is out of service for a long time or when it
is to be transported.
is to be transported.
The illustration shows the state when the PT-cover is removed
for explanation purposes only.
for explanation purposes only.
Fig.
Head-up position
:
Cleaning position
When the head and platen roller are to be cleaned.
Do not leave the head-up lever in this position; Failure to do
so might result in a deformed H-spring, thus leading to poor
print or paper feed quality.
so might result in a deformed H-spring, thus leading to poor
print or paper feed quality.
The illustration shows the state when the PT-cover is removed
for explanation purposes only.
for explanation purposes only.
Fig.
Cleaning position
Head
Head Up Lever
H-Spring
Platen roller
(In contact)
H-Spring
Head
Head Up Lever
Platen roller
H-Spring
Head
Head Up Lever
Platen roller
(2) When storing the printer
Printer
•
When storing the printer, make sure to raise the head up lever
in the
in the
: Head up position. Never store it with the
: Close
position or
: Cleaning position.
•
Avoid storing the printer in areas with a lot of dust, direct sun-
light, or high humidity.
light, or high humidity.
•
If the printer is stored for an extended period, put it in a anti-
static bag and store it in a dry place.
static bag and store it in a dry place.
•
The thermal paper should not be left for an extended period
(more than two weeks at normal temperature) held between
the platen roller and the head (
(more than two weeks at normal temperature) held between
the platen roller and the head (
: Close position).
•
Do not leave the printer in the
: Checking position for more
than 2 days.
Paper (thermal paper)
•
Since thermal paper gradually darkens from about 70°C, pay
attention to heat, humidity, sun light, etc., regardless whether or
not the paper has been printed on.
attention to heat, humidity, sun light, etc., regardless whether or
not the paper has been printed on.
•
Avoid high temperature and high humidity areas.
•
Avoid direct sun light.
(When thermal paper is left near the window in direct sun
light, the base color may change and discoloring may take
place.)
(When thermal paper is left near the window in direct sun
light, the base color may change and discoloring may take
place.)
(3) When using the printer
Printer
•
Since the printer contains a thermal head, permanent magnets
(motor) and micro switches, avoid using it in areas with a lot of
iron powder, dust, etc.
(motor) and micro switches, avoid using it in areas with a lot of
iron powder, dust, etc.
•
Never operate with no paper loaded.
•
Never pull out the paper (forward or backward) with the head
head against the platen rollers.
head against the platen rollers.
•
Do not touch the head heating elements and driver Ics, espe-
cially with hard or metal objects.
cially with hard or metal objects.
•
During printing and just after printing completes (for about 15
minutes), the area around the head and the motor surface are
very hot. Never directly touch them with your hand.
minutes), the area around the head and the motor surface are
very hot. Never directly touch them with your hand.
•
Operate the head up lever only when required.
Never touch the surface of the head heating elements.
(Dirt may stick to the heating elements and affect the printing.)
Never touch the surface of the head heating elements.
(Dirt may stick to the heating elements and affect the printing.)
•
Never leave the printer with the platen rollers and the head
directly touching (
directly touching (
: Close position).
Do not leave the head-up lever in the
: Cleaning position for
more than 2 days.
(When the printer is left for a while, make sure to raise the head
up lever in the
(When the printer is left for a while, make sure to raise the head
up lever in the
➡
: direction in Fig. Loading paper.)
•
Since electronic parts are used in the print head, never touch
the thermal head with your bare hand.
Before handling the printer, execute proper body grounding
procedures to avoid static electricity.
the thermal head with your bare hand.
Before handling the printer, execute proper body grounding
procedures to avoid static electricity.
Paper (thermal paper)
•
Use only the specified thermal paper.
(Thermal paper with a rough surface may result in poor printer
quality and shorten the print head life.)
(Thermal paper with a rough surface may result in poor printer
quality and shorten the print head life.)
(4) When mounting the printer
•
Make sure the power is turned OFF before installing the printer to
an ECR.
an ECR.
•
When attaching the printer to your product, avoid areas with a lot
of iron powder, dust, etc.
of iron powder, dust, etc.
2. Loading the Paper (insertion and
removal)
Use only the paper specified in the specification sheet issued by our
company.
company.
(1) Loading paper
Load paper following the procedure below.
Cut the edge of the paper as shown in the figure below.
Fig. Shape of the cut paper edge
Fig. Paper setting state
Fig. Loading paper
Turn the ECR ON.
Make sure the head-up lever in the
(Close) position.
Insert the paper through the paper inlet.
The paper is automatically loaded into the printer by the auto
loading mechanism and the leading edge of the paper roll is deliv-
ered a little from the paper outlet.
loading mechanism and the leading edge of the paper roll is deliv-
ered a little from the paper outlet.
If there is slackness in the paper or paper is loaded slantly, set the
head up lever in the head up position
head up lever in the head up position
and adjust the paper
position.
If the length of the paper delivered from the outlet is insufficient,
feed the paper properly with the key board of the ECR.
feed the paper properly with the key board of the ECR.
(Notes) If paper is fed without following the above procedure, it
could cause improper paper feeding and jamming.
Good
Wrong
Good
Wrong
Good
Bad
A
B
C
Recording paper
Head up lever
(2) Unloading the paper
The paper can be unloaded in two ways.
Move the head up lever toward
: Head up position and then pull
the paper out by hand in the forward direction (feeding direction)
or in the reverse direction.
or in the reverse direction.
Operate the paper feed mechanism to discharge the paper from
the printer. Move the head up lever to the head up position
the printer. Move the head up lever to the head up position
and
remove the paper toward the front.
(Notes)
•
Operations other than those listed above could cause im-
proper paper feeding and jamming, and could cause
breaking of the head heating elements.
proper paper feeding and jamming, and could cause
breaking of the head heating elements.
•
Never pull the paper out without using the head up lever,
regardless of the direction, forward or reverse.
regardless of the direction, forward or reverse.
(3) Removing paper after a paper jam
If a paper jam occurs, follow the procedure below.
Put the head-up lever in the
Cleaning position to widen the
spacing between the head and platen rollers so that you can
easily check for a paper jam.
easily check for a paper jam.
Remove a jammed paper by hand.
Return the head-up lever in the
Close position.
When a tool such as tweezers, is used to remove paper chips, take
care not to touch the heating elements of the head with the tool.
Since the head is still hot just after the operation printing is stopped,
wait a while for the head to cool down.
care not to touch the heating elements of the head with the tool.
Since the head is still hot just after the operation printing is stopped,
wait a while for the head to cool down.
CHAPTER 4. MAINTENANCE
To maintain proper performance of the printer for a long period of
time and to prevent trouble, carry out the maintenance and manage-
ment procedures as follows.
time and to prevent trouble, carry out the maintenance and manage-
ment procedures as follows.
1. Cleaning
•
Removing stains
Wipe dirt off the head and platen rollers with a clean cloth satu-
rated with an alcoholic solvent (ethanol, methanol, IPA: Isopropyl
alcohol).
For cleaning the head part, refer to daily checks.
Wipe dirt off the head and platen rollers with a clean cloth satu-
rated with an alcoholic solvent (ethanol, methanol, IPA: Isopropyl
alcohol).
For cleaning the head part, refer to daily checks.
(Notes) Never use thinner, benzine, trichlene or ketone group sol-
vents, since they may damage or deteriorate rubber and
plastic parts.
plastic parts.
•
Removing dust and fuzz
Cleaning by suction (with a vacuum cleaner) is desirable.
Suck up all the dust and fuzz.
Cleaning by suction (with a vacuum cleaner) is desirable.
Suck up all the dust and fuzz.
(Notes) Check lubrication at various points after cleaning, and lubri-
cate with oil at the specified locations.
2. Inspection
The maintenance and inspection items for the printer are dividend
into 2 types. One is "Daily checks" for the person who uses the
printer, and the other is "Periodic checks" for someone with more
technical knowledge. Maintenance and inspections should be carried
out by properly qualified personnel.
into 2 types. One is "Daily checks" for the person who uses the
printer, and the other is "Periodic checks" for someone with more
technical knowledge. Maintenance and inspections should be carried
out by properly qualified personnel.
(1) Daily checks
Check that the printer is used properly and kept in the good repair.
Daily check items
The specified paper is being used.
The paper has not become discolored.
Check print quality and if significant deterioration is found, clean
the head heating elements.
the head heating elements.
<Head cleaning method>
1) Place the head-up lever in the
: Cleaning position. Make sure it
is securely locked.
2) Wipe the heating element of the head and platen rollers clean with
a soft cloth or cotton pledget moistened with alcoholic solvent
(ethanol, methanol or IPA: isopropyl alcohol).
(ethanol, methanol or IPA: isopropyl alcohol).
3) After making sure the alcoholic solvent has thoroughly evapo-
rated, undo the head-up lever and platen rollers in the
Close
position.
If paper dust is attached to the platen roller surface, the paper
feeding power is reduced. Be sure to clean the platen roller sur-
face when cleaning the head.
feeding power is reduced. Be sure to clean the platen roller sur-
face when cleaning the head.
The illustration shows the state when the PT-cover is removed for
explanation purposes only.
explanation purposes only.
Fig. Head and Platen roller cleaning
Cotton swab
Platen roller
Thermal head unit
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