How to change tax set from gst and pst to hst 15% on my tec ma-1650-4 series thanks

SOURCE: Change Tax Rate

I found this on the Casio site. I think yours is a printing model. If it is use the 2nd set of instrucitons. Hope it works...

Programming Tax Rate
Non-printing models (also applies to HR-8TE printing calculator):
1. Press [AC]
2. Hold [SET/%] key for about 2 seconds
3. Press [TAX+]
4. Input the tax rate
5. Press [SET/%]

Printing models (except HR-8TE):
1. Have calculator in “print” mode
2. Press [CA]
3. Hold [SET/%] key for about 3 seconds
4. Input the tax rate
5. Press [TAX+]
6. Press [SET/%]

SOURCE: How do you set the tax rate

Example: setting 5% tax rate

1. move mode switch to 'rate set '
2. press 5 (for tax rate ) followed by TAX+ button
3. Move mode switch to GT

to add tax to e.g 200 type:
200 TAX+, the result is 210

SOURCE: Casio PCR-T275 Tax settings

Comment je programme les taxe de tvq 5% et tps 7.5 % pour le québec sur ma caisse casio pcr-t275

SOURCE: Programming a TEC 1650

Here is a link to the operations manual. There are several pages with the shortcuts you are looking for and are easily printed out. Hope this solves your problem.
http://www.toshibatecusa.com/LinkClick.aspx?link=Owners+Manuals%2fma1650om.pdf&tabid=167&mid=556

SOURCE: manual for the electronic sharp cash register XE-A101

just search on google manual for sharp cash registers and go to webite of sharp besides when it says that just click cl and help 2 times and start over