Mechanical Troubleshooting - Sony DPP-FP95 Service Manual

2-2. MECHANICAL TROUBLESHOOTING

The troubles caused by the thermal printer can be classified into
the following 3 groups.
• Paper handling cannot be performed normally. (Paper feed/eject
trouble)
• Ink ribbon cannot be fed normally. (Ribbon trouble)
• Printing cannot be performed normally. (Printing trouble)
Example of each trouble, and the cause and remedy are described.
1. Paper feed/eject trouble
Trouble: • Paper cannot be fed from the paper tray.
• Although the paper is fed from the paper tray, it is
stopped halfway.
Check: • Check if the PU lever operation is normal by
performing the mode transition operation by
Mechanic Test in the service mode.
Normal: Other cause
Abnormal: Abnormal thermal printer
Others: • Decrease in frictional force due to the contamination
of paper feed roller
• Abnormal installation of paper tray
Remedy: • When the thermal printer is abnormal, replace the
thermal printer.
• When the paper feed roller contamination is the cause,
perform the cleaning (wipe dry) of paper feed roller.
• When the paper tray installation is abnormal, check
if the PU lever is placed under the tray plate and
reinstall the paper tray.
Trouble: • Paper is normally fed, but the paper is ejected without
printing (white paper).
• Multiple sheets of paper are fed continuously.
(Multiple feed)
Cause: Paper detection failure
Remedy: • Replace the MAI board.
• If the trouble persists after the MAI board is replaced,
replace the thermal printer.
Trouble: Although paper is fed, it is ejected backwards as it is.
Cause: Paper detection failure
Remedy: • Replace the MAI board.
• If the trouble persists after the MAI board is replaced,
replace the thermal printer.
Trouble: Paper is folded and stuck in the printer, and it cannot be
removed. (Paper jamming)
Cause: • Abnormal thermal printer
• Abnormal print cartridge
Remedy: • Remove the thermal printer from the lower cabinet
and remove the paper.
• When the thermal printer is abnormal, replace the
thermal printer.
• Check the print cartridge. (Deformation, damage,
slack in ribbon, etc. of print cartridge)
DPP-FP95
2. Ribbon trouble
Trouble: Ribbon is wrapped around the grid roller and pinch
roller, and cannot be removed. (Ribbon jamming)
Cause: • Abnormal print cartridge
• Abnormal thermal printer
Remedy: • Remove the thermal printer from the lower cabinet.
Rotate the gear that is engaged with the stepping
motor gear and remove the ribbon.
• When the thermal printer is abnormal, replace the
thermal printer.
Trouble: • Ribbon continues to rotate at the start of printing.
• Ribbon does not rotate at the start of printing.
Cause: • Abnormal thermal printer
• Abnormal MAI board
• Abnormal installation of paper tray and print cartridge
Remedy: • Replace the MAI board.
• If the trouble persists after the MAI board is replaced,
replace the thermal printer.
• Reinstall the paper tray and print cartridge.
Trouble: • Paper is ejected without printing (white paper) and
"Print cartridge is not correct" is displayed.
Cause: • Print cartridge assembly failure
• Abnormal thermal printer
• Abnormal MAI board
Remedy: • Replace the ribbon cassette.
• Replace the MAI board.
• If the trouble persists after the MAI board is replaced,
replace the thermal printer.
2-2