Citizen iDp 3550 prints double-spaced

Maintenance and Service on Page 41.

https://cdn.barcodesinc.com/resources/iDP3550UME_09E.pdf

Or you could try bypassing the sensor.

Service manual, but it is a 21 year old printer!

https://manualzz.com/doc/6424525/idp3550_3551-service-manual

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That is a setting in your printer setup menu under options or advanced. Page set up should come up under advanced or as its own tab.

try drivers for windows vista

Thank you for posting to Fixya.com and it is my pleasure to guide you.

To help you in the furture I have found the manual for reference. Click the link or copy paste it to download it. http://www.posguys.com/download/iDP3550UME_09E.pdf

From the manual for the Interface Cables, the manual has pictures.

4.2 Connecting the Interface Cable
1. Turn off the power. (Mating side included)
2. Check the top and bottom of the cable terminals, and connect to the interface connector.
3. Secure the cable terminals.
Serial interface: Tighten screws to secure.
Parallel interface : Turn clamps to secure.
4. Connect the interface cable to the computer.

4.3 Connecting the Drawer Kick-Out Connector
1. Turn off the power.
2. Check the top and bottom of the drawer kick-out cable connector and connect it to the drawer kick-out connector located at the lower section of the printer.
3. Screw the grounding cable of the drawer to the grounding terminal located at the lower section of the printer.
CAUTION: • Connect only the prescribed drawer (Solenoid) to the drawer kick -out connector.

Good luck and please post back that you are successful and give thumbs up if my solution has worked for you. If I can be more helpful just reply.

After installing the printer and the software you must reboot the computer to register the hardware changes. After booting up open your "printers" from the Control Panel or Start "settings - printers".
Make sure that the printer is listed. If it is listed, right click on it and select "properties". Now the printer control panel will come up. Select - "Print test page". If the software and cables are installed correctly the printer will be listed and it will print the test page.
In the same way, with a right click on the printer you can select to make it your "Default" printer.

New operating systems will see the new hardware and offer to install it for you. If you say yes and OK the computer will do an internet search and it should find the correct drivers for your operating system. If it does not find the correct drivers for your operating system you may have to the companies web page and select support - downloads and find your correct driver.

Try to turn the printer off and then on again. If that does not clear it you need to re-install the driver, the driver may be corrupt.

if you double click on the printer in "printers and faxes" menu you should be able to click on the "printer" menu and click "cancel all documents" if it seems to hang on "deleting" right click on "my computer" and click "manage" expand the "services and applications" menu and click on services. find and single click on the the print spooler service and click "restart service" that should clear the job. If not, power the printer off, reboot your PC and then power the printer back on.

You can download the user manual from this link for this device
http://www.citizen-systems.co.jp/english/support/download/printer/document/user/data_box/iDP3535UME.pdf

Try reseting to factory defaults.
Power unit on while holding down "tear" and "FF Load" buttons.
Hope this helps
Dezzi

There may be a dip switch somewhere on the printer which enables/disables the extra linefeed. If both CR (carriage return) & LF (linefeed) are both enabled, you will get the double-spacing. In years past, I've run a few different Epson dot matrix printers, and seems like they had such a dip switch. Also, on the software end, you may be able to disable either CR or LF- check in your printer driver software.