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9820/9830/9835Service Manual Confidential Tests and Adjustments
24 TC9830SM Rev. B 7/98 Confidential July 1998
5. Following a totals number, the routine prompts
another response. Any entry other than Y results
in an abort.
6. Press D to return to the Sensor Display screen or
press L to exit the Sensor Display test sequence.
Print Contrast Adjustment
Adjust print contrast if printing is too light or too dark.
TOOLS REQUIRED:
• Small Flat-head Screwdriver
Using a small flat-head screwdriver, turn print contrast
knob(clockwise for darker print--counterclockwise
for lighter print).
Figure 5- 1. Print Contrast Adjustment
NOTE: Adjustments may also be made via
immediate commands. Refer to the Packet
Reference Manual for information on proper
syntax.
Platen Motor Gear Adjustment
This procedure adjusts the backlash in the platen drive
gear train. It should be performed each time a Platen
Assembly or a Platen Motor Assembly is replaced.
TOOLS/MATERIALS REQUIRED:
• 6-inch Phillips Screwdriver
• Paper Shimstock (0.006” to 0.008” thick) or
Label Backing Paper Liner (folded 3 layers
thick)
1. Turn printer off and unplug power cord.
2. Raise cover and ensure printhead is latched in the
down position.
3. Remove printer housing.
Figure 5- 2. Platen Motor Gear Adjustment
4. Using the paper shimstock, check clearance
between the bearer on the platen motor gear and
the bearer on the platen gear. (See Figure 5-2)
Clearance should be between 0.006” and 0.008”.
5. If clearance is less than or greater than the
specification, perform steps 7 thru 11.
6. With printhead fully latched, loosen four Phillips
head screws holding platen motor.
7. With paper shimstock in place, move platen motor
housing to adjust for specification clearance.
8. Tighten all four screws.
9. Rotate platen by hand 360° to check for binding or
excessive backlash.
10. Repeat steps 7 thru 10 as necessary.
Ribbon Tension Adjustment
There are two Ribbon Tension Adjustments: The
Ribbon Supply Roller Eccentric, and the Ribbon Take-
up Roller Eccentric.
Rotation of the supply roller eccentric provides even
tension across the width of the ribbon on the supply
side of the printhead (Typically, the factory setting for
the supply eccentric is primarily horizontal). Rotation
of the take-up roller eccentric (adjusted after the
supply eccentric) provides even tension across the
width of the ribbon on the take-up side of the
printhead.
Either adjustment moves the outside end of the ribbon
roller to change the pressure on the ribbon. The
overall result of properly adjusted eccentrics is
consistent ribbon tracking.
MATERIALS REQUIRED:
• 4” thermal transfer supply (ex: MMTP4055
900091)
• 4” ribbon