Service manual for Husqvarna Viking Classica 100 please?

Question edited for clarity and correct order of make model.
Question moved for Cars and Trucks category.

Unfortunately there isn't one. Owner manual only. Service agents are factory trained, and have online resources, but generally they already know their way around inside all machines.

https://www.google.com/search?q=Husqvarna+Viking+Classica+100+service+manual

If it is stuck in reverse, there is help on Fixya from 2012.
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Sounds like a bind in the slide block which you get to from the back. It is near the hand wheel.

Look at this page for a visual to help you determine the type of "shank" you have.

http://www.clotilde.com/pages/which_foot.html

The best way is to take it to an authorized repairman.
You can try getting it very warm, like putting it in the warmest sunlit room in the house, or in the back seat of the car in sunlight. If it works better when it gets warm, the reverse mechanism will need to be cleaned. Then you can take it to an authorized repairmain.

I have a copy. If you still need it, I can e-mail you a copy.

sounds like it needs servicing and cleaned. Suggest only using authorized husqvarna viking dealer for service. You can find your local dealer at the Husqvarna Viking website http://www.husqvarnaviking.com and selecting "dealers" link.

I suspect you are correctly threading the machine but the timing of the needle and bobbin hook is off. When the threaded needle goes into the bobbin area, a pointed hook grabs the thread and loops it with the bobbin thread. Something is catching when the needle starts to come up that is not allowing the bobbin thread to be pulled back through the needle plate opening by the upper thread. With machine threaded and bobbin in place, have the bobbin area open if possible and watch the thread interaction when the needle goes down. To set the hook/needle timing, normally covers have to be removed. Suggest taking it to an authorized Husqvarna Viking dealer for service. You can find the nearest dealer by click on the "Dealer" link at http://www.husqvarnaviking.com
Good luck.

Yes, these parts should be replaced. Original parts are only available from an authorized Husqvarna Viking Dealer. The service/repair is very intense and should be performed by a certified Husqvarna Viking service technician through the Dealer. You can find the nearest dealer by click on the "Dealer" link at http://www.husqvarnaviking.com
Good luck.

Call Husqvarna at: 1-800-474-6437. They may be able to get you a photo copy of the original owners manual.

I find a classica 100 on www.sewingmanuals.com. Would that be similar?