TallyGenicom 6300 Series, Maintenance Manual

Page: 51 / 175

Chapter 3. Faults and Troubleshooting
45
3.4.7 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 Controller Board.
5. The hammer may be sticking due to contamination, such as paper and ink buildup.
Step 1.
Open the cover and paper guide areas.
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 Cable
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 cover,
etc.
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 to the affected coils.
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 Controller Board
also. Defective Hammer Drivers can cause problems with Hammer Coils. Instructions
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 Controller Board. Remove and replace the Controller Board.