Here is a direct link to a User's Manual for a Sanyo EMS 156AW:
To view the Owner's Manual with Operating Instructions just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information at the website indicated and the contents of the Owner's Manual.
You may need ADOBE READER installed on your computer to read PDF documents.
You can download this free at WWW.ADOBE.COM
Click on the DOWNLOAD ADOBE READER button on right side of the ADOBE home page when you get there, then follow the onscreen instructions to install the software on your computer.
See page 8 of the manual for detailed instructions and illustrations on how to set the clock.
Basically it reads as follows:
Press the CLOCK button pad.
Use the numbers pad to enter the correct time.
Press the CLOCK button pad again.
Hopefully these instructions will be applicable to your particular model as well.
Please comment back here to this page if you have any details to add, have any questions, have difficulty accessing the links, or just require further general assistance and I will respond as soon as I see it.
I hope that was helpful to you, good luck and take care.