Tally T6090, Maintenace Manual

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T6090 Maintenance Manual
3–14
Two adjacent character columns not printing
There are five things that can cause this problem.
1. Broken Hammer.
2. Defective Hammer Coil; either shorted or open.
3. Defective Hammer Bank Cable.
4. Malfunctioning Engine Controller CBA.
5. The hammer may be sticking due to contamination, such as paper and ink
buildup.
Troubleshooting Procedure
STEP 1. Remove the right end cover of the printer.
STEP 2. Inspect the Hammer Bank cables for rub spots, cracked insulation, burn spots, etc.
If any physical defects are found in the cables, remove and replace the Ham-
mer Bank Assembly and correct the cause of the problem with the cable.
Test the printer to see if the problem is still present. If it isn’t, reinstall the
right end cover and place the printer back in service.
If the problem is still present, proceed to STEP 3.
If no physical defects are found proceed to the next step.
STEP 3. Remove the Ribbon Cartridge and Ribbon Platform.
STEP 4. Check continuity from the Hammer Bank Cable Connector (J703) to the affected coils.
To assist you in checking continuity, connector pinouts (Table 3–3) and illustrations
showing the pin arrangements of the connector and the soldered connections on the
Hammer Bank (Table 3–4) are included at the end of this chapter.
STEP 5. Check continuity of the Hammer Coil. Resistance of the coil should be 12
Ω
(Ohms)
±
.3
Ω
at 70
°
F. If the coil resistance is outside of this range, remove and replace the
Hammer Module.
If the Hammer Coil is defective, check the Hammer Driver on the Engine Controller
CBA also. Defective Hammer Drivers can cause problems with Hammer Coils. Instruc-
tions for checking Hammer Drivers are located at the end of this chapter.
STEP 6. Is the hammer broken or defective? If so, remove and replace the Hammer Module.
STEP 7. Check between the Hammer Plate and the Hammer Module Return Plate and between
the Hammer Head and Hammer Coil for ink and paper buildup. Clean the Hammer
Bank by prying out
gently on the hammer with your finger and running a piece of
paper behind the hammer to remove the contamination. For stubborn buildup you may
use a little isopropyl alcohol on the paper to loosen the contamination.
STEP 8. If there are no physical defects, shorts, or opens, the likely cause of the problem is a
malfunctioning Engine Controller CBA. Remove and replace the Engine Controller
CBA.