Try Settings->Searches, Reports and Alerts and search for ScheduledView
If you see the dashboard listed there, try changing the permissions from owner (private) to the required visibility. (Each dashboard user, that set up schedule PDF, might have their own private _ScheduledView of that dashboard.)
Well, yes, I dont see "permisssion" option in the dashboard for me. So how can the pdf scheduler can be made viewed to other users? they are unable to see the pdf scheduled for that dashboard whereas I can see that.
Under Reports, find the report you are using for the dashboard. Click the Edit drop down, then Edit Permissions. Be sure to set the Read to Everyone, or whatever role system you might be using.