How to calibrate a Pelouze model 4010 scale with a

When i turn on my 4010.the screen display shows 4010 but thats all it does.any solution.

From http://sites.dymo.com/Search/Pages/SupportSearchResults.aspx?k=4010%20calibration&start1=0

4010 CALIBRATION (newer models) released 12/8/95
1. Press and hold the ZERO and lb/kg keys simultaneously.
2. Press and release the ON key while still holding the ZERO and lb/kg keys.
3. Continue holding down both keys until display shows CALB.
4. Press ZERO to reset and apply 130 pounds to the platform
- display shows a count which must be greater than 500.
5. After the count stablizes press the lb/kg key to save this value.
- display now shows END.
6. Press OFF to turn scale off

Calibration instructions for Older Model 4010 (with a date code of 5103 or older)
1. You will need 3 – 50 lb weights to calibrate this scale
2. Turn off scale
3. Press and hold the LB/KG and the ZERO button simultaneously and
continue to hold till instructed in step 5
4. Press and release the ON button
5. The unit will display a number. Release the LB/KG and ZERO buttons. You
will see a number on screen. Press the ZERO button and you will see C50
6. Place the 50 lb weight on the scale and press ZERO. You should see C100
7. Place another 50 lb weight on the scale (total 100 lb) and press ZERO. You
should see C150.
8. Place the remaining 50 lb weight on the scale (total 150 lb) and push ZERO
9. You will see a final message (end) and the scale should shut off
Your scale should now be recalibrated

On my Pelouze 4010, I press ON and it shows up only the number 4150 and does not change to Zero neither point pound or kg. Where is the problem?

How do I get it apart so I can replace the cord?