EZ Manual M-8400RVe
Electric Checks and Adjustments
Ribbon Clutch Adjustment
Print Head Position Alignment
Print Head Balance Adjustment
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EZ Manual: M-8400RVe
2
Electric Checks
and Adjustments
This explains how to check levels of DC power supply, Imark sensor and gap sensor. Ensure that printer power
is off. Remove the LH cover and then perform the following
steps.
Additional equipment required
TP Test Module
Digital Multimeter
STEPS
1 Attach the connector from the TP Test Module to the
test port on the MAIN PCB. Note correct positioning
of connector. Nibs on the connector are placed down
on the PCB in the forward position.
Cable to TP Test Module
Cable to PCB
2 Attach the ground probe of the Digital Multimeter to
the TP Test Mod ule ground pin (G ND PIN).
3 Attach positive probe of the Multimeter to the + SIG
PIN on the TP Test Module terminal.
4 Turn printer power on and rotate the dial to a position
0-5 on the TP Test Module by referring to the diagram
on the next page. Record the values from the Multimeter.
5 Confirm the recorded voltages are within the voltage
range. If not, replace parts or adjust sensor level. Refer
to Check and Adjustment chart.
6 After performing test, put the LH cover back to the
printer.
Ground PIN
SIG PIN
TP Test Module
Dial
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EZ Manual: M-8400RVe
3
Electric Checks and Adjustments
Chart 1
Dial test point
Comment
Voltage
Voltage Range
Check pin on TP Test Module and Main PCB
Adjustment to VR
0
DC power Supply
+5.0 VDC
+4.8V to +5.2V
CH3A(+5.0V) - CH1A(GND)
N/A
1
DC power Supply
+2.0 VDC
+1.9V to +2.1V
CH4A(+2.0V) - CH1A(GND)
N/A
2
DC power Supply
+3.3 VDC
+3.1V to +3.5V
CH5A(+3.3V) - CH1A(GND)
N/A
3
DC power Supply
+24.0 VDC
+23.5V to +24.5V
CH6A(+24.0V) - CH1A(GND)
N/A
CH1B(+8.4V) - CH1A(GND)
VR5
CH2B - CH1A(GND)
VR4
Low level (Set the blank area
on the sensor) = A
4
I-Mark Sensor Level
High level (Set the I-mark
on the sensor) = B
High level - Low level =
A - B = more than +0.9V
Low level (Set the label backing liner or the
centre hole [in case of the centre hole tag]
on the sensor) = C
5
Gap sensor Level
High level (Set the label or
tag on the sensor) = D
High level - Low level =
C - D = more than +1.0V
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EZ Manual: M-8400RVe
Electric Checks and Adjustments
Potentiometers are located on MAIN PCB.
VR1(OFS)
Pitch Offset Adjustment
VR2(DEM)
Dispenser Sensor Level Adjustment
VR3(CE)
Ribbon Sensor Level Adjustment
VR4(GAP)
Gap Sensor Level Adjustment
VR5(IM)
I-Mark Sensor Level Adjustment
4
Chart 2
VR5 I-mark
VR4 Gap
VR1 Offset
VR2 DEM
VR3 CE
MAIN PCB
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Potentiometers are located on FRONT PANEL
PRINT
Adjust Print Darkness
OFFSET
Adjust FEED/BACKFEED
PITCH
Adjust Pitch Offset
DISPLAY
Adjust Display Darkness
5
Electric Checks and Adjustments
Chart 3
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EZ Manual: M-8400RVe
Excessive ribbon and rewind tension will result in variable
STEPS
motion and could be the cause of print quality problems.
Ensure the ribbon rewind and unwind tensions are within
specifications or adjustment of either clutch is necessary.
1 Switch the printer OFF and disconnect the power
cable.
6
Ribbon Clutch
Adjustment
2 Raise the top access door and open the front access
Required equipment
door. Remove the ribbon and label stock if installed.
1 Empty Ribbon Core and String
2 12mm Wrench
3 Attach string to an empty ribbon core and place on
3 1kg or 2kg Tension Gage
the Ribbon Spindle. Wind the string tightly around the
4 #2 Pozidrv Screwdriver
ribbon core in single layer and in clockwise direction.
Attach the end of the string to the tension gauge.
3
4
4 Gradually lift the tension gauge, pulling the string unwind
it from the core. Once the spindle starts to move, the
gauge should be indicate 950 to 1050 grams of tension
for ribbon rewind, and 550 to 650 grams of tension
2
for ribbon unwind. Refer to pictures in next page.
5 To adjust the clutch, loosen the locking screw and
1
move the adjust nut CW for more tension and CCW
for less tension. Tighten the locking screw and repeat
steps 3 and 4 until the correct tension is achieved.
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7
Ribbon Clutch
Adjustment continued
Ribbon Unwind Clutch 550g-650g Unwind
Locking Screw is inside Adjust Nut
Adjust Nut
Ribbon Rewind Clutch 950g-1050g Rewind
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Minor Adjustment
STEPS
Required equipment
1 Loosen the screws on the head plate. Print user test
10mm Open End Wrench
pattern. Realign the print head by prying adjust plate
“+”Screw-driver
forward or backward with flat blade screwdriver. Refer
(JIS No.2 equivalent)
to il lus tr ati ons and no te ad jus tment mark s.
To adjust the print head alignment and consistent quality
8
Print Head Position
Alignment
2 Tighten the screws.
across label, perform the following steps:
Adjustment Marks
Screw
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EZ Manual: M-8400RVe
9
Print Head Balance
Adjustment
Major Adjustment
Required equipment
“+”Screw-driver
(JIS No.2 equivalent)
STEPS
1
Loosen the set screw.
2 Turn the adjust screw to make adjustment.
Turn the adjust screw in clockwise or
in counter-clockwise direction depending on the situation
3 If the front side of label is too light, turn the screw in
clockwise direction.
4 If the front side of label is too dark, turn the screw in
counter-clockwise direction.
Loosen the set screw
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