Brother MP-21C Service Manual page 110

Banding
Vertical lines exist
2.1.3 PC-driven printing
Trouble
PC-driven printing is
impossible.
- Adjust the horizontal alignment from the printer driver.
- Check the correct media setting is selected in the printer
driver for the paper to be printed.
- Adjust the amount of line feeding with the Service software
tool software.
- Replace the Print head.
- Replace the carriage ASSY.
Check the following components:
- Head PCB
- Power supply PCB
- Check the correct media setting is selected in the printer
driver.
Check
Check the following:
- Connection of the Parallel interface cable to the printer and
the host PC.
- Connection of the AC adapter.
- If the Printer interface card is inserted securely.
- If the PC card cable connecting the Printer interface card
(CI-100) and the printer is connected securely.
- If the Waste ink tube is routed correctly.
- If a suitable port setting is selected on the printer driver.
Set LPT1 when the Parallel Interface cable is used.
Set LPT2 when the Printer interface card is used.
IV-9