Hi Kirpal,
Thanks for posting image of the printer. This defect symptom can be caused by contaminated HVPS-to-transfer belt contacts. Locate the four metal power contacts on the top-left side of the transfer belt assembly and clean the metal power contacts and transfer belt with a lint-free cloth and try to print.
If the issue persists, the Transfer belt needs to be replaced.
If the printer is under warranty, I would be glad to arrange a service on the printer. Check warranty status: http://dell.to/13VPd97
Please private message me the service tag, registered owners name and address.
To private message me please click my user name and click Start conversation.
In case of expired warranty scenario, we would not be able to extend warranty entitled services.
If the warranty on the printer has expired, below link would help you in contacting expired warranty services (this is for US based customers):http://dell.to/VPYT4T
Awaiting your response!