Question about Casio Office Equipment & Supplies

# Is there a replacement battery for the Casio SL-300SV. Calculator

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### Anonymous

To change the tax rate, first press AC. Then press SET % for 2 seconds. Next, press TAX+, then enter the new or current tax rate. Enter the rate for a single digit tax rate such as 5% as 5, a single number; if you have a fractional percentage rate, such as 5.75%, enter it just that way: the 5, then a decimal and followed by 7& 5. Then press SET % again and you're done! I just did it on two of the calculators and it works. Hope this helps!

Posted on Jan 28, 2009

### Anonymous

u have to check the the correct polarity of the cell and the calci.... put the cell in all combination and press ON key.... if still u have problem ur calci might have some internal problem that u can't solve.......
for more contact [email protected]

Posted on Feb 25, 2010

### Davis Hunter

http://www.chung-sim.com/casio.sl.210te.html

Posted on Jun 01, 2011

### Andreas

SOURCE: casio calculator problem

Seems to be a common problem on this otherwise great calculator that helped me through both high school and university. I've had mine for nearly 20 years and this problem showed up a few years ago. But I remember classmates reported the same problem when it was almost new.

If replacing batteries isn't helping, the problem is most likely caused by oxidation on the springs connecting the battery holder to the main PCB. The solution is as follows:

1. Remove the metal back cover (2 screws)
2. Remove the plastic back lid by removing the black screws (leave the batteries mounted) and CAREFULLY slide the back lid to the lower end (where the EXE button is located). Do not lift while sliding until the lid easily comes off.
3. On the back side of the plastic lid, very carefully bend the the two metal connectors ~1 mm on both batteryholders to increase their tension.
4. Clean the connecting pads on the PCB and the metal springs with de-oxidizer solvent.
5. Re-assemble and your 4500P calculator should be good as new.

Posted on Mar 28, 2012

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Good Morning Fhaas153

Looking at a J-10 picture on eBay
http://www.ebay.com/itm/VINTAGE-CASIO-J-10-ELECTRONIC-CALCULATOR-8-DIGIT-TESTED-/331587643662 , the picture of the rear says '1.5V battery x 2. Looking at this other shot
http://www.casio-calculator.com/Museum/Calculator/FGHIJ/J-10/Casio-J-10-back.jpg It looks like there is a fairly clear Slide-to-Open Battery door at the top of the rear panel. Given the battery rating at 1.5 Volts and the door size, I'd suspect it'll take either AA or AAA batteries. You should be able to slide the door and look, and most battery compartments will have an indication of the specific cell.

To be sure I'm covering both the what and the how, slide the door open. Remove old batteries if still there. Clean up contacts with a bit of fine steel wool if they are corroded or covered with old battery fuzz. Put new batteries in - negative end towards the coil springs generally. Replace sliding hatch.

Hoping this covers what you're looking for!
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Non-printing models (also applies to SL-300vc):

1. Press [AC]
2. Hold [SET/%] key for about 2 seconds
3. Press [TAX+]
4. Input the tax rate
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LR54x1 is not the the model number of your calculator. It is the reference of the button battery you calculator uses.
Check your number model and then go to Casio support page http://www.casio.com/support/manuals/, click on "Calculators", agree to the Terms and Conditions, and look for your calculator.
If your calculator isn't listed, download the manual for the SL-450L under Standard Calculator. It will probably be suitable for your calculator too.
Also read the FAQS for Casio calculators

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### As the VAT has changed in the UK to 15% instead of 17.5% i need to change this on my Casio calculator. I have a Casio MJ 100. Please help me!

Hi. Switch on using the Ac button
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You will be show either the current tax held or zero
Type in the tax you want ie 15
Now press the taxSet button.

To verify its worked prees Ac button then press the Tax+ button is should now show you 15%. Hope this helps.

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second:clean power switch with contact cleaner.

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